diff --git a/doc/md/faq.md b/doc/md/faq.md
index 2e5497d89..59283511b 100644
--- a/doc/md/faq.md
+++ b/doc/md/faq.md
@@ -827,17 +827,19 @@ func (e *EncodeExtension) Templates() []*gen.Template {
 	return []*gen.Template{
 		gen.MustParse(gen.NewTemplate("model/additional/jsonencode").
 			Parse(`
-// MarshalJSON implements the json.Marshaler interface.
-func ({{ $.Receiver }} *{{ $.Name }}) MarshalJSON() ([]byte, error) {
-	type Alias {{ $.Name }}
-	return json.Marshal(&struct {
-		*Alias
-		{{ $.Name }}Edges
-	}{
-		Alias: (*Alias)({{ $.Receiver }}),
-		{{ $.Name }}Edges: {{ $.Receiver }}.Edges,
-	})
-}
+{{ if $.Edges }}
+	// MarshalJSON implements the json.Marshaler interface.
+	func ({{ $.Receiver }} *{{ $.Name }}) MarshalJSON() ([]byte, error) {
+		type Alias {{ $.Name }}
+		return json.Marshal(&struct {
+			*Alias
+			{{ $.Name }}Edges
+		}{
+			Alias: (*Alias)({{ $.Receiver }}),
+			{{ $.Name }}Edges: {{ $.Receiver }}.Edges,
+		})
+	}
+{{ end }}
 `)),
 	}
 }
diff --git a/examples/jsonencode/ent/card.go b/examples/jsonencode/ent/card.go
new file mode 100644
index 000000000..83b567bcc
--- /dev/null
+++ b/examples/jsonencode/ent/card.go
@@ -0,0 +1,103 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"fmt"
+	"strings"
+
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/examples/jsonencode/ent/card"
+)
+
+// Card is the model entity for the Card schema.
+type Card struct {
+	config `json:"-"`
+	// ID of the ent.
+	ID int `json:"id,omitempty"`
+	// Number holds the value of the "number" field.
+	Number string `json:"number,omitempty"`
+}
+
+// scanValues returns the types for scanning values from sql.Rows.
+func (*Card) scanValues(columns []string) ([]any, error) {
+	values := make([]any, len(columns))
+	for i := range columns {
+		switch columns[i] {
+		case card.FieldID:
+			values[i] = new(sql.NullInt64)
+		case card.FieldNumber:
+			values[i] = new(sql.NullString)
+		default:
+			return nil, fmt.Errorf("unexpected column %q for type Card", columns[i])
+		}
+	}
+	return values, nil
+}
+
+// assignValues assigns the values that were returned from sql.Rows (after scanning)
+// to the Card fields.
+func (c *Card) assignValues(columns []string, values []any) error {
+	if m, n := len(values), len(columns); m < n {
+		return fmt.Errorf("mismatch number of scan values: %d != %d", m, n)
+	}
+	for i := range columns {
+		switch columns[i] {
+		case card.FieldID:
+			value, ok := values[i].(*sql.NullInt64)
+			if !ok {
+				return fmt.Errorf("unexpected type %T for field id", value)
+			}
+			c.ID = int(value.Int64)
+		case card.FieldNumber:
+			if value, ok := values[i].(*sql.NullString); !ok {
+				return fmt.Errorf("unexpected type %T for field number", values[i])
+			} else if value.Valid {
+				c.Number = value.String
+			}
+		}
+	}
+	return nil
+}
+
+// Update returns a builder for updating this Card.
+// Note that you need to call Card.Unwrap() before calling this method if this Card
+// was returned from a transaction, and the transaction was committed or rolled back.
+func (c *Card) Update() *CardUpdateOne {
+	return (&CardClient{config: c.config}).UpdateOne(c)
+}
+
+// Unwrap unwraps the Card entity that was returned from a transaction after it was closed,
+// so that all future queries will be executed through the driver which created the transaction.
+func (c *Card) Unwrap() *Card {
+	_tx, ok := c.config.driver.(*txDriver)
+	if !ok {
+		panic("ent: Card is not a transactional entity")
+	}
+	c.config.driver = _tx.drv
+	return c
+}
+
+// String implements the fmt.Stringer.
+func (c *Card) String() string {
+	var builder strings.Builder
+	builder.WriteString("Card(")
+	builder.WriteString(fmt.Sprintf("id=%v, ", c.ID))
+	builder.WriteString("number=")
+	builder.WriteString(c.Number)
+	builder.WriteByte(')')
+	return builder.String()
+}
+
+// Cards is a parsable slice of Card.
+type Cards []*Card
+
+func (c Cards) config(cfg config) {
+	for _i := range c {
+		c[_i].config = cfg
+	}
+}
diff --git a/examples/jsonencode/ent/card/card.go b/examples/jsonencode/ent/card/card.go
new file mode 100644
index 000000000..e7bdfc212
--- /dev/null
+++ b/examples/jsonencode/ent/card/card.go
@@ -0,0 +1,34 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package card
+
+const (
+	// Label holds the string label denoting the card type in the database.
+	Label = "card"
+	// FieldID holds the string denoting the id field in the database.
+	FieldID = "id"
+	// FieldNumber holds the string denoting the number field in the database.
+	FieldNumber = "number"
+	// Table holds the table name of the card in the database.
+	Table = "cards"
+)
+
+// Columns holds all SQL columns for card fields.
+var Columns = []string{
+	FieldID,
+	FieldNumber,
+}
+
+// ValidColumn reports if the column name is valid (part of the table columns).
+func ValidColumn(column string) bool {
+	for i := range Columns {
+		if column == Columns[i] {
+			return true
+		}
+	}
+	return false
+}
diff --git a/examples/jsonencode/ent/card/where.go b/examples/jsonencode/ent/card/where.go
new file mode 100644
index 000000000..c6e66cdcf
--- /dev/null
+++ b/examples/jsonencode/ent/card/where.go
@@ -0,0 +1,159 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package card
+
+import (
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/examples/jsonencode/ent/predicate"
+)
+
+// ID filters vertices based on their ID field.
+func ID(id int) predicate.Card {
+	return predicate.Card(sql.FieldEQ(FieldID, id))
+}
+
+// IDEQ applies the EQ predicate on the ID field.
+func IDEQ(id int) predicate.Card {
+	return predicate.Card(sql.FieldEQ(FieldID, id))
+}
+
+// IDNEQ applies the NEQ predicate on the ID field.
+func IDNEQ(id int) predicate.Card {
+	return predicate.Card(sql.FieldNEQ(FieldID, id))
+}
+
+// IDIn applies the In predicate on the ID field.
+func IDIn(ids ...int) predicate.Card {
+	return predicate.Card(sql.FieldIn(FieldID, ids...))
+}
+
+// IDNotIn applies the NotIn predicate on the ID field.
+func IDNotIn(ids ...int) predicate.Card {
+	return predicate.Card(sql.FieldNotIn(FieldID, ids...))
+}
+
+// IDGT applies the GT predicate on the ID field.
+func IDGT(id int) predicate.Card {
+	return predicate.Card(sql.FieldGT(FieldID, id))
+}
+
+// IDGTE applies the GTE predicate on the ID field.
+func IDGTE(id int) predicate.Card {
+	return predicate.Card(sql.FieldGTE(FieldID, id))
+}
+
+// IDLT applies the LT predicate on the ID field.
+func IDLT(id int) predicate.Card {
+	return predicate.Card(sql.FieldLT(FieldID, id))
+}
+
+// IDLTE applies the LTE predicate on the ID field.
+func IDLTE(id int) predicate.Card {
+	return predicate.Card(sql.FieldLTE(FieldID, id))
+}
+
+// Number applies equality check predicate on the "number" field. It's identical to NumberEQ.
+func Number(v string) predicate.Card {
+	return predicate.Card(sql.FieldEQ(FieldNumber, v))
+}
+
+// NumberEQ applies the EQ predicate on the "number" field.
+func NumberEQ(v string) predicate.Card {
+	return predicate.Card(sql.FieldEQ(FieldNumber, v))
+}
+
+// NumberNEQ applies the NEQ predicate on the "number" field.
+func NumberNEQ(v string) predicate.Card {
+	return predicate.Card(sql.FieldNEQ(FieldNumber, v))
+}
+
+// NumberIn applies the In predicate on the "number" field.
+func NumberIn(vs ...string) predicate.Card {
+	return predicate.Card(sql.FieldIn(FieldNumber, vs...))
+}
+
+// NumberNotIn applies the NotIn predicate on the "number" field.
+func NumberNotIn(vs ...string) predicate.Card {
+	return predicate.Card(sql.FieldNotIn(FieldNumber, vs...))
+}
+
+// NumberGT applies the GT predicate on the "number" field.
+func NumberGT(v string) predicate.Card {
+	return predicate.Card(sql.FieldGT(FieldNumber, v))
+}
+
+// NumberGTE applies the GTE predicate on the "number" field.
+func NumberGTE(v string) predicate.Card {
+	return predicate.Card(sql.FieldGTE(FieldNumber, v))
+}
+
+// NumberLT applies the LT predicate on the "number" field.
+func NumberLT(v string) predicate.Card {
+	return predicate.Card(sql.FieldLT(FieldNumber, v))
+}
+
+// NumberLTE applies the LTE predicate on the "number" field.
+func NumberLTE(v string) predicate.Card {
+	return predicate.Card(sql.FieldLTE(FieldNumber, v))
+}
+
+// NumberContains applies the Contains predicate on the "number" field.
+func NumberContains(v string) predicate.Card {
+	return predicate.Card(sql.FieldContains(FieldNumber, v))
+}
+
+// NumberHasPrefix applies the HasPrefix predicate on the "number" field.
+func NumberHasPrefix(v string) predicate.Card {
+	return predicate.Card(sql.FieldHasPrefix(FieldNumber, v))
+}
+
+// NumberHasSuffix applies the HasSuffix predicate on the "number" field.
+func NumberHasSuffix(v string) predicate.Card {
+	return predicate.Card(sql.FieldHasSuffix(FieldNumber, v))
+}
+
+// NumberEqualFold applies the EqualFold predicate on the "number" field.
+func NumberEqualFold(v string) predicate.Card {
+	return predicate.Card(sql.FieldEqualFold(FieldNumber, v))
+}
+
+// NumberContainsFold applies the ContainsFold predicate on the "number" field.
+func NumberContainsFold(v string) predicate.Card {
+	return predicate.Card(sql.FieldContainsFold(FieldNumber, v))
+}
+
+// And groups predicates with the AND operator between them.
+func And(predicates ...predicate.Card) predicate.Card {
+	return predicate.Card(func(s *sql.Selector) {
+		s1 := s.Clone().SetP(nil)
+		for _, p := range predicates {
+			p(s1)
+		}
+		s.Where(s1.P())
+	})
+}
+
+// Or groups predicates with the OR operator between them.
+func Or(predicates ...predicate.Card) predicate.Card {
+	return predicate.Card(func(s *sql.Selector) {
+		s1 := s.Clone().SetP(nil)
+		for i, p := range predicates {
+			if i > 0 {
+				s1.Or()
+			}
+			p(s1)
+		}
+		s.Where(s1.P())
+	})
+}
+
+// Not applies the not operator on the given predicate.
+func Not(p predicate.Card) predicate.Card {
+	return predicate.Card(func(s *sql.Selector) {
+		p(s.Not())
+	})
+}
diff --git a/examples/jsonencode/ent/card_create.go b/examples/jsonencode/ent/card_create.go
new file mode 100644
index 000000000..1a6442b09
--- /dev/null
+++ b/examples/jsonencode/ent/card_create.go
@@ -0,0 +1,189 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"entgo.io/ent/dialect/sql/sqlgraph"
+	"entgo.io/ent/examples/jsonencode/ent/card"
+	"entgo.io/ent/schema/field"
+)
+
+// CardCreate is the builder for creating a Card entity.
+type CardCreate struct {
+	config
+	mutation *CardMutation
+	hooks    []Hook
+}
+
+// SetNumber sets the "number" field.
+func (cc *CardCreate) SetNumber(s string) *CardCreate {
+	cc.mutation.SetNumber(s)
+	return cc
+}
+
+// Mutation returns the CardMutation object of the builder.
+func (cc *CardCreate) Mutation() *CardMutation {
+	return cc.mutation
+}
+
+// Save creates the Card in the database.
+func (cc *CardCreate) Save(ctx context.Context) (*Card, error) {
+	return withHooks[*Card, CardMutation](ctx, cc.sqlSave, cc.mutation, cc.hooks)
+}
+
+// SaveX calls Save and panics if Save returns an error.
+func (cc *CardCreate) SaveX(ctx context.Context) *Card {
+	v, err := cc.Save(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
+// Exec executes the query.
+func (cc *CardCreate) Exec(ctx context.Context) error {
+	_, err := cc.Save(ctx)
+	return err
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (cc *CardCreate) ExecX(ctx context.Context) {
+	if err := cc.Exec(ctx); err != nil {
+		panic(err)
+	}
+}
+
+// check runs all checks and user-defined validators on the builder.
+func (cc *CardCreate) check() error {
+	if _, ok := cc.mutation.Number(); !ok {
+		return &ValidationError{Name: "number", err: errors.New(`ent: missing required field "Card.number"`)}
+	}
+	return nil
+}
+
+func (cc *CardCreate) sqlSave(ctx context.Context) (*Card, error) {
+	if err := cc.check(); err != nil {
+		return nil, err
+	}
+	_node, _spec := cc.createSpec()
+	if err := sqlgraph.CreateNode(ctx, cc.driver, _spec); err != nil {
+		if sqlgraph.IsConstraintError(err) {
+			err = &ConstraintError{msg: err.Error(), wrap: err}
+		}
+		return nil, err
+	}
+	id := _spec.ID.Value.(int64)
+	_node.ID = int(id)
+	cc.mutation.id = &_node.ID
+	cc.mutation.done = true
+	return _node, nil
+}
+
+func (cc *CardCreate) createSpec() (*Card, *sqlgraph.CreateSpec) {
+	var (
+		_node = &Card{config: cc.config}
+		_spec = &sqlgraph.CreateSpec{
+			Table: card.Table,
+			ID: &sqlgraph.FieldSpec{
+				Type:   field.TypeInt,
+				Column: card.FieldID,
+			},
+		}
+	)
+	if value, ok := cc.mutation.Number(); ok {
+		_spec.SetField(card.FieldNumber, field.TypeString, value)
+		_node.Number = value
+	}
+	return _node, _spec
+}
+
+// CardCreateBulk is the builder for creating many Card entities in bulk.
+type CardCreateBulk struct {
+	config
+	builders []*CardCreate
+}
+
+// Save creates the Card entities in the database.
+func (ccb *CardCreateBulk) Save(ctx context.Context) ([]*Card, error) {
+	specs := make([]*sqlgraph.CreateSpec, len(ccb.builders))
+	nodes := make([]*Card, len(ccb.builders))
+	mutators := make([]Mutator, len(ccb.builders))
+	for i := range ccb.builders {
+		func(i int, root context.Context) {
+			builder := ccb.builders[i]
+			var mut Mutator = MutateFunc(func(ctx context.Context, m Mutation) (Value, error) {
+				mutation, ok := m.(*CardMutation)
+				if !ok {
+					return nil, fmt.Errorf("unexpected mutation type %T", m)
+				}
+				if err := builder.check(); err != nil {
+					return nil, err
+				}
+				builder.mutation = mutation
+				nodes[i], specs[i] = builder.createSpec()
+				var err error
+				if i < len(mutators)-1 {
+					_, err = mutators[i+1].Mutate(root, ccb.builders[i+1].mutation)
+				} else {
+					spec := &sqlgraph.BatchCreateSpec{Nodes: specs}
+					// Invoke the actual operation on the latest mutation in the chain.
+					if err = sqlgraph.BatchCreate(ctx, ccb.driver, spec); err != nil {
+						if sqlgraph.IsConstraintError(err) {
+							err = &ConstraintError{msg: err.Error(), wrap: err}
+						}
+					}
+				}
+				if err != nil {
+					return nil, err
+				}
+				mutation.id = &nodes[i].ID
+				if specs[i].ID.Value != nil {
+					id := specs[i].ID.Value.(int64)
+					nodes[i].ID = int(id)
+				}
+				mutation.done = true
+				return nodes[i], nil
+			})
+			for i := len(builder.hooks) - 1; i >= 0; i-- {
+				mut = builder.hooks[i](mut)
+			}
+			mutators[i] = mut
+		}(i, ctx)
+	}
+	if len(mutators) > 0 {
+		if _, err := mutators[0].Mutate(ctx, ccb.builders[0].mutation); err != nil {
+			return nil, err
+		}
+	}
+	return nodes, nil
+}
+
+// SaveX is like Save, but panics if an error occurs.
+func (ccb *CardCreateBulk) SaveX(ctx context.Context) []*Card {
+	v, err := ccb.Save(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
+// Exec executes the query.
+func (ccb *CardCreateBulk) Exec(ctx context.Context) error {
+	_, err := ccb.Save(ctx)
+	return err
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (ccb *CardCreateBulk) ExecX(ctx context.Context) {
+	if err := ccb.Exec(ctx); err != nil {
+		panic(err)
+	}
+}
diff --git a/examples/jsonencode/ent/card_delete.go b/examples/jsonencode/ent/card_delete.go
new file mode 100644
index 000000000..0ddc6cd78
--- /dev/null
+++ b/examples/jsonencode/ent/card_delete.go
@@ -0,0 +1,92 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"context"
+
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/dialect/sql/sqlgraph"
+	"entgo.io/ent/examples/jsonencode/ent/card"
+	"entgo.io/ent/examples/jsonencode/ent/predicate"
+	"entgo.io/ent/schema/field"
+)
+
+// CardDelete is the builder for deleting a Card entity.
+type CardDelete struct {
+	config
+	hooks    []Hook
+	mutation *CardMutation
+}
+
+// Where appends a list predicates to the CardDelete builder.
+func (cd *CardDelete) Where(ps ...predicate.Card) *CardDelete {
+	cd.mutation.Where(ps...)
+	return cd
+}
+
+// Exec executes the deletion query and returns how many vertices were deleted.
+func (cd *CardDelete) Exec(ctx context.Context) (int, error) {
+	return withHooks[int, CardMutation](ctx, cd.sqlExec, cd.mutation, cd.hooks)
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (cd *CardDelete) ExecX(ctx context.Context) int {
+	n, err := cd.Exec(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return n
+}
+
+func (cd *CardDelete) sqlExec(ctx context.Context) (int, error) {
+	_spec := &sqlgraph.DeleteSpec{
+		Node: &sqlgraph.NodeSpec{
+			Table: card.Table,
+			ID: &sqlgraph.FieldSpec{
+				Type:   field.TypeInt,
+				Column: card.FieldID,
+			},
+		},
+	}
+	if ps := cd.mutation.predicates; len(ps) > 0 {
+		_spec.Predicate = func(selector *sql.Selector) {
+			for i := range ps {
+				ps[i](selector)
+			}
+		}
+	}
+	affected, err := sqlgraph.DeleteNodes(ctx, cd.driver, _spec)
+	if err != nil && sqlgraph.IsConstraintError(err) {
+		err = &ConstraintError{msg: err.Error(), wrap: err}
+	}
+	cd.mutation.done = true
+	return affected, err
+}
+
+// CardDeleteOne is the builder for deleting a single Card entity.
+type CardDeleteOne struct {
+	cd *CardDelete
+}
+
+// Exec executes the deletion query.
+func (cdo *CardDeleteOne) Exec(ctx context.Context) error {
+	n, err := cdo.cd.Exec(ctx)
+	switch {
+	case err != nil:
+		return err
+	case n == 0:
+		return &NotFoundError{card.Label}
+	default:
+		return nil
+	}
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (cdo *CardDeleteOne) ExecX(ctx context.Context) {
+	cdo.cd.ExecX(ctx)
+}
diff --git a/examples/jsonencode/ent/card_query.go b/examples/jsonencode/ent/card_query.go
new file mode 100644
index 000000000..40918e562
--- /dev/null
+++ b/examples/jsonencode/ent/card_query.go
@@ -0,0 +1,540 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"context"
+	"fmt"
+	"math"
+
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/dialect/sql/sqlgraph"
+	"entgo.io/ent/examples/jsonencode/ent/card"
+	"entgo.io/ent/examples/jsonencode/ent/predicate"
+	"entgo.io/ent/schema/field"
+)
+
+// CardQuery is the builder for querying Card entities.
+type CardQuery struct {
+	config
+	limit      *int
+	offset     *int
+	unique     *bool
+	order      []OrderFunc
+	fields     []string
+	inters     []Interceptor
+	predicates []predicate.Card
+	// intermediate query (i.e. traversal path).
+	sql  *sql.Selector
+	path func(context.Context) (*sql.Selector, error)
+}
+
+// Where adds a new predicate for the CardQuery builder.
+func (cq *CardQuery) Where(ps ...predicate.Card) *CardQuery {
+	cq.predicates = append(cq.predicates, ps...)
+	return cq
+}
+
+// Limit the number of records to be returned by this query.
+func (cq *CardQuery) Limit(limit int) *CardQuery {
+	cq.limit = &limit
+	return cq
+}
+
+// Offset to start from.
+func (cq *CardQuery) Offset(offset int) *CardQuery {
+	cq.offset = &offset
+	return cq
+}
+
+// Unique configures the query builder to filter duplicate records on query.
+// By default, unique is set to true, and can be disabled using this method.
+func (cq *CardQuery) Unique(unique bool) *CardQuery {
+	cq.unique = &unique
+	return cq
+}
+
+// Order specifies how the records should be ordered.
+func (cq *CardQuery) Order(o ...OrderFunc) *CardQuery {
+	cq.order = append(cq.order, o...)
+	return cq
+}
+
+// First returns the first Card entity from the query.
+// Returns a *NotFoundError when no Card was found.
+func (cq *CardQuery) First(ctx context.Context) (*Card, error) {
+	nodes, err := cq.Limit(1).All(newQueryContext(ctx, TypeCard, "First"))
+	if err != nil {
+		return nil, err
+	}
+	if len(nodes) == 0 {
+		return nil, &NotFoundError{card.Label}
+	}
+	return nodes[0], nil
+}
+
+// FirstX is like First, but panics if an error occurs.
+func (cq *CardQuery) FirstX(ctx context.Context) *Card {
+	node, err := cq.First(ctx)
+	if err != nil && !IsNotFound(err) {
+		panic(err)
+	}
+	return node
+}
+
+// FirstID returns the first Card ID from the query.
+// Returns a *NotFoundError when no Card ID was found.
+func (cq *CardQuery) FirstID(ctx context.Context) (id int, err error) {
+	var ids []int
+	if ids, err = cq.Limit(1).IDs(newQueryContext(ctx, TypeCard, "FirstID")); err != nil {
+		return
+	}
+	if len(ids) == 0 {
+		err = &NotFoundError{card.Label}
+		return
+	}
+	return ids[0], nil
+}
+
+// FirstIDX is like FirstID, but panics if an error occurs.
+func (cq *CardQuery) FirstIDX(ctx context.Context) int {
+	id, err := cq.FirstID(ctx)
+	if err != nil && !IsNotFound(err) {
+		panic(err)
+	}
+	return id
+}
+
+// Only returns a single Card entity found by the query, ensuring it only returns one.
+// Returns a *NotSingularError when more than one Card entity is found.
+// Returns a *NotFoundError when no Card entities are found.
+func (cq *CardQuery) Only(ctx context.Context) (*Card, error) {
+	nodes, err := cq.Limit(2).All(newQueryContext(ctx, TypeCard, "Only"))
+	if err != nil {
+		return nil, err
+	}
+	switch len(nodes) {
+	case 1:
+		return nodes[0], nil
+	case 0:
+		return nil, &NotFoundError{card.Label}
+	default:
+		return nil, &NotSingularError{card.Label}
+	}
+}
+
+// OnlyX is like Only, but panics if an error occurs.
+func (cq *CardQuery) OnlyX(ctx context.Context) *Card {
+	node, err := cq.Only(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return node
+}
+
+// OnlyID is like Only, but returns the only Card ID in the query.
+// Returns a *NotSingularError when more than one Card ID is found.
+// Returns a *NotFoundError when no entities are found.
+func (cq *CardQuery) OnlyID(ctx context.Context) (id int, err error) {
+	var ids []int
+	if ids, err = cq.Limit(2).IDs(newQueryContext(ctx, TypeCard, "OnlyID")); err != nil {
+		return
+	}
+	switch len(ids) {
+	case 1:
+		id = ids[0]
+	case 0:
+		err = &NotFoundError{card.Label}
+	default:
+		err = &NotSingularError{card.Label}
+	}
+	return
+}
+
+// OnlyIDX is like OnlyID, but panics if an error occurs.
+func (cq *CardQuery) OnlyIDX(ctx context.Context) int {
+	id, err := cq.OnlyID(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return id
+}
+
+// All executes the query and returns a list of Cards.
+func (cq *CardQuery) All(ctx context.Context) ([]*Card, error) {
+	ctx = newQueryContext(ctx, TypeCard, "All")
+	if err := cq.prepareQuery(ctx); err != nil {
+		return nil, err
+	}
+	qr := querierAll[[]*Card, *CardQuery]()
+	return withInterceptors[[]*Card](ctx, cq, qr, cq.inters)
+}
+
+// AllX is like All, but panics if an error occurs.
+func (cq *CardQuery) AllX(ctx context.Context) []*Card {
+	nodes, err := cq.All(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return nodes
+}
+
+// IDs executes the query and returns a list of Card IDs.
+func (cq *CardQuery) IDs(ctx context.Context) ([]int, error) {
+	var ids []int
+	ctx = newQueryContext(ctx, TypeCard, "IDs")
+	if err := cq.Select(card.FieldID).Scan(ctx, &ids); err != nil {
+		return nil, err
+	}
+	return ids, nil
+}
+
+// IDsX is like IDs, but panics if an error occurs.
+func (cq *CardQuery) IDsX(ctx context.Context) []int {
+	ids, err := cq.IDs(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return ids
+}
+
+// Count returns the count of the given query.
+func (cq *CardQuery) Count(ctx context.Context) (int, error) {
+	ctx = newQueryContext(ctx, TypeCard, "Count")
+	if err := cq.prepareQuery(ctx); err != nil {
+		return 0, err
+	}
+	return withInterceptors[int](ctx, cq, querierCount[*CardQuery](), cq.inters)
+}
+
+// CountX is like Count, but panics if an error occurs.
+func (cq *CardQuery) CountX(ctx context.Context) int {
+	count, err := cq.Count(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return count
+}
+
+// Exist returns true if the query has elements in the graph.
+func (cq *CardQuery) Exist(ctx context.Context) (bool, error) {
+	ctx = newQueryContext(ctx, TypeCard, "Exist")
+	switch _, err := cq.FirstID(ctx); {
+	case IsNotFound(err):
+		return false, nil
+	case err != nil:
+		return false, fmt.Errorf("ent: check existence: %w", err)
+	default:
+		return true, nil
+	}
+}
+
+// ExistX is like Exist, but panics if an error occurs.
+func (cq *CardQuery) ExistX(ctx context.Context) bool {
+	exist, err := cq.Exist(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return exist
+}
+
+// Clone returns a duplicate of the CardQuery builder, including all associated steps. It can be
+// used to prepare common query builders and use them differently after the clone is made.
+func (cq *CardQuery) Clone() *CardQuery {
+	if cq == nil {
+		return nil
+	}
+	return &CardQuery{
+		config:     cq.config,
+		limit:      cq.limit,
+		offset:     cq.offset,
+		order:      append([]OrderFunc{}, cq.order...),
+		predicates: append([]predicate.Card{}, cq.predicates...),
+		// clone intermediate query.
+		sql:    cq.sql.Clone(),
+		path:   cq.path,
+		unique: cq.unique,
+	}
+}
+
+// GroupBy is used to group vertices by one or more fields/columns.
+// It is often used with aggregate functions, like: count, max, mean, min, sum.
+//
+// Example:
+//
+//	var v []struct {
+//		Number string `json:"number,omitempty"`
+//		Count int `json:"count,omitempty"`
+//	}
+//
+//	client.Card.Query().
+//		GroupBy(card.FieldNumber).
+//		Aggregate(ent.Count()).
+//		Scan(ctx, &v)
+func (cq *CardQuery) GroupBy(field string, fields ...string) *CardGroupBy {
+	cq.fields = append([]string{field}, fields...)
+	grbuild := &CardGroupBy{build: cq}
+	grbuild.flds = &cq.fields
+	grbuild.label = card.Label
+	grbuild.scan = grbuild.Scan
+	return grbuild
+}
+
+// Select allows the selection one or more fields/columns for the given query,
+// instead of selecting all fields in the entity.
+//
+// Example:
+//
+//	var v []struct {
+//		Number string `json:"number,omitempty"`
+//	}
+//
+//	client.Card.Query().
+//		Select(card.FieldNumber).
+//		Scan(ctx, &v)
+func (cq *CardQuery) Select(fields ...string) *CardSelect {
+	cq.fields = append(cq.fields, fields...)
+	sbuild := &CardSelect{CardQuery: cq}
+	sbuild.label = card.Label
+	sbuild.flds, sbuild.scan = &cq.fields, sbuild.Scan
+	return sbuild
+}
+
+// Aggregate returns a CardSelect configured with the given aggregations.
+func (cq *CardQuery) Aggregate(fns ...AggregateFunc) *CardSelect {
+	return cq.Select().Aggregate(fns...)
+}
+
+func (cq *CardQuery) prepareQuery(ctx context.Context) error {
+	for _, inter := range cq.inters {
+		if inter == nil {
+			return fmt.Errorf("ent: uninitialized interceptor (forgotten import ent/runtime?)")
+		}
+		if trv, ok := inter.(Traverser); ok {
+			if err := trv.Traverse(ctx, cq); err != nil {
+				return err
+			}
+		}
+	}
+	for _, f := range cq.fields {
+		if !card.ValidColumn(f) {
+			return &ValidationError{Name: f, err: fmt.Errorf("ent: invalid field %q for query", f)}
+		}
+	}
+	if cq.path != nil {
+		prev, err := cq.path(ctx)
+		if err != nil {
+			return err
+		}
+		cq.sql = prev
+	}
+	return nil
+}
+
+func (cq *CardQuery) sqlAll(ctx context.Context, hooks ...queryHook) ([]*Card, error) {
+	var (
+		nodes = []*Card{}
+		_spec = cq.querySpec()
+	)
+	_spec.ScanValues = func(columns []string) ([]any, error) {
+		return (*Card).scanValues(nil, columns)
+	}
+	_spec.Assign = func(columns []string, values []any) error {
+		node := &Card{config: cq.config}
+		nodes = append(nodes, node)
+		return node.assignValues(columns, values)
+	}
+	for i := range hooks {
+		hooks[i](ctx, _spec)
+	}
+	if err := sqlgraph.QueryNodes(ctx, cq.driver, _spec); err != nil {
+		return nil, err
+	}
+	if len(nodes) == 0 {
+		return nodes, nil
+	}
+	return nodes, nil
+}
+
+func (cq *CardQuery) sqlCount(ctx context.Context) (int, error) {
+	_spec := cq.querySpec()
+	_spec.Node.Columns = cq.fields
+	if len(cq.fields) > 0 {
+		_spec.Unique = cq.unique != nil && *cq.unique
+	}
+	return sqlgraph.CountNodes(ctx, cq.driver, _spec)
+}
+
+func (cq *CardQuery) querySpec() *sqlgraph.QuerySpec {
+	_spec := &sqlgraph.QuerySpec{
+		Node: &sqlgraph.NodeSpec{
+			Table:   card.Table,
+			Columns: card.Columns,
+			ID: &sqlgraph.FieldSpec{
+				Type:   field.TypeInt,
+				Column: card.FieldID,
+			},
+		},
+		From:   cq.sql,
+		Unique: true,
+	}
+	if unique := cq.unique; unique != nil {
+		_spec.Unique = *unique
+	}
+	if fields := cq.fields; len(fields) > 0 {
+		_spec.Node.Columns = make([]string, 0, len(fields))
+		_spec.Node.Columns = append(_spec.Node.Columns, card.FieldID)
+		for i := range fields {
+			if fields[i] != card.FieldID {
+				_spec.Node.Columns = append(_spec.Node.Columns, fields[i])
+			}
+		}
+	}
+	if ps := cq.predicates; len(ps) > 0 {
+		_spec.Predicate = func(selector *sql.Selector) {
+			for i := range ps {
+				ps[i](selector)
+			}
+		}
+	}
+	if limit := cq.limit; limit != nil {
+		_spec.Limit = *limit
+	}
+	if offset := cq.offset; offset != nil {
+		_spec.Offset = *offset
+	}
+	if ps := cq.order; len(ps) > 0 {
+		_spec.Order = func(selector *sql.Selector) {
+			for i := range ps {
+				ps[i](selector)
+			}
+		}
+	}
+	return _spec
+}
+
+func (cq *CardQuery) sqlQuery(ctx context.Context) *sql.Selector {
+	builder := sql.Dialect(cq.driver.Dialect())
+	t1 := builder.Table(card.Table)
+	columns := cq.fields
+	if len(columns) == 0 {
+		columns = card.Columns
+	}
+	selector := builder.Select(t1.Columns(columns...)...).From(t1)
+	if cq.sql != nil {
+		selector = cq.sql
+		selector.Select(selector.Columns(columns...)...)
+	}
+	if cq.unique != nil && *cq.unique {
+		selector.Distinct()
+	}
+	for _, p := range cq.predicates {
+		p(selector)
+	}
+	for _, p := range cq.order {
+		p(selector)
+	}
+	if offset := cq.offset; offset != nil {
+		// limit is mandatory for offset clause. We start
+		// with default value, and override it below if needed.
+		selector.Offset(*offset).Limit(math.MaxInt32)
+	}
+	if limit := cq.limit; limit != nil {
+		selector.Limit(*limit)
+	}
+	return selector
+}
+
+// CardGroupBy is the group-by builder for Card entities.
+type CardGroupBy struct {
+	selector
+	build *CardQuery
+}
+
+// Aggregate adds the given aggregation functions to the group-by query.
+func (cgb *CardGroupBy) Aggregate(fns ...AggregateFunc) *CardGroupBy {
+	cgb.fns = append(cgb.fns, fns...)
+	return cgb
+}
+
+// Scan applies the selector query and scans the result into the given value.
+func (cgb *CardGroupBy) Scan(ctx context.Context, v any) error {
+	ctx = newQueryContext(ctx, TypeCard, "GroupBy")
+	if err := cgb.build.prepareQuery(ctx); err != nil {
+		return err
+	}
+	return scanWithInterceptors[*CardQuery, *CardGroupBy](ctx, cgb.build, cgb, cgb.build.inters, v)
+}
+
+func (cgb *CardGroupBy) sqlScan(ctx context.Context, root *CardQuery, v any) error {
+	selector := root.sqlQuery(ctx).Select()
+	aggregation := make([]string, 0, len(cgb.fns))
+	for _, fn := range cgb.fns {
+		aggregation = append(aggregation, fn(selector))
+	}
+	if len(selector.SelectedColumns()) == 0 {
+		columns := make([]string, 0, len(*cgb.flds)+len(cgb.fns))
+		for _, f := range *cgb.flds {
+			columns = append(columns, selector.C(f))
+		}
+		columns = append(columns, aggregation...)
+		selector.Select(columns...)
+	}
+	selector.GroupBy(selector.Columns(*cgb.flds...)...)
+	if err := selector.Err(); err != nil {
+		return err
+	}
+	rows := &sql.Rows{}
+	query, args := selector.Query()
+	if err := cgb.build.driver.Query(ctx, query, args, rows); err != nil {
+		return err
+	}
+	defer rows.Close()
+	return sql.ScanSlice(rows, v)
+}
+
+// CardSelect is the builder for selecting fields of Card entities.
+type CardSelect struct {
+	*CardQuery
+	selector
+}
+
+// Aggregate adds the given aggregation functions to the selector query.
+func (cs *CardSelect) Aggregate(fns ...AggregateFunc) *CardSelect {
+	cs.fns = append(cs.fns, fns...)
+	return cs
+}
+
+// Scan applies the selector query and scans the result into the given value.
+func (cs *CardSelect) Scan(ctx context.Context, v any) error {
+	ctx = newQueryContext(ctx, TypeCard, "Select")
+	if err := cs.prepareQuery(ctx); err != nil {
+		return err
+	}
+	return scanWithInterceptors[*CardQuery, *CardSelect](ctx, cs.CardQuery, cs, cs.inters, v)
+}
+
+func (cs *CardSelect) sqlScan(ctx context.Context, root *CardQuery, v any) error {
+	selector := root.sqlQuery(ctx)
+	aggregation := make([]string, 0, len(cs.fns))
+	for _, fn := range cs.fns {
+		aggregation = append(aggregation, fn(selector))
+	}
+	switch n := len(*cs.selector.flds); {
+	case n == 0 && len(aggregation) > 0:
+		selector.Select(aggregation...)
+	case n != 0 && len(aggregation) > 0:
+		selector.AppendSelect(aggregation...)
+	}
+	rows := &sql.Rows{}
+	query, args := selector.Query()
+	if err := cs.driver.Query(ctx, query, args, rows); err != nil {
+		return err
+	}
+	defer rows.Close()
+	return sql.ScanSlice(rows, v)
+}
diff --git a/examples/jsonencode/ent/card_update.go b/examples/jsonencode/ent/card_update.go
new file mode 100644
index 000000000..daf2742a6
--- /dev/null
+++ b/examples/jsonencode/ent/card_update.go
@@ -0,0 +1,209 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/dialect/sql/sqlgraph"
+	"entgo.io/ent/examples/jsonencode/ent/card"
+	"entgo.io/ent/examples/jsonencode/ent/predicate"
+	"entgo.io/ent/schema/field"
+)
+
+// CardUpdate is the builder for updating Card entities.
+type CardUpdate struct {
+	config
+	hooks    []Hook
+	mutation *CardMutation
+}
+
+// Where appends a list predicates to the CardUpdate builder.
+func (cu *CardUpdate) Where(ps ...predicate.Card) *CardUpdate {
+	cu.mutation.Where(ps...)
+	return cu
+}
+
+// SetNumber sets the "number" field.
+func (cu *CardUpdate) SetNumber(s string) *CardUpdate {
+	cu.mutation.SetNumber(s)
+	return cu
+}
+
+// Mutation returns the CardMutation object of the builder.
+func (cu *CardUpdate) Mutation() *CardMutation {
+	return cu.mutation
+}
+
+// Save executes the query and returns the number of nodes affected by the update operation.
+func (cu *CardUpdate) Save(ctx context.Context) (int, error) {
+	return withHooks[int, CardMutation](ctx, cu.sqlSave, cu.mutation, cu.hooks)
+}
+
+// SaveX is like Save, but panics if an error occurs.
+func (cu *CardUpdate) SaveX(ctx context.Context) int {
+	affected, err := cu.Save(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return affected
+}
+
+// Exec executes the query.
+func (cu *CardUpdate) Exec(ctx context.Context) error {
+	_, err := cu.Save(ctx)
+	return err
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (cu *CardUpdate) ExecX(ctx context.Context) {
+	if err := cu.Exec(ctx); err != nil {
+		panic(err)
+	}
+}
+
+func (cu *CardUpdate) sqlSave(ctx context.Context) (n int, err error) {
+	_spec := &sqlgraph.UpdateSpec{
+		Node: &sqlgraph.NodeSpec{
+			Table:   card.Table,
+			Columns: card.Columns,
+			ID: &sqlgraph.FieldSpec{
+				Type:   field.TypeInt,
+				Column: card.FieldID,
+			},
+		},
+	}
+	if ps := cu.mutation.predicates; len(ps) > 0 {
+		_spec.Predicate = func(selector *sql.Selector) {
+			for i := range ps {
+				ps[i](selector)
+			}
+		}
+	}
+	if value, ok := cu.mutation.Number(); ok {
+		_spec.SetField(card.FieldNumber, field.TypeString, value)
+	}
+	if n, err = sqlgraph.UpdateNodes(ctx, cu.driver, _spec); err != nil {
+		if _, ok := err.(*sqlgraph.NotFoundError); ok {
+			err = &NotFoundError{card.Label}
+		} else if sqlgraph.IsConstraintError(err) {
+			err = &ConstraintError{msg: err.Error(), wrap: err}
+		}
+		return 0, err
+	}
+	cu.mutation.done = true
+	return n, nil
+}
+
+// CardUpdateOne is the builder for updating a single Card entity.
+type CardUpdateOne struct {
+	config
+	fields   []string
+	hooks    []Hook
+	mutation *CardMutation
+}
+
+// SetNumber sets the "number" field.
+func (cuo *CardUpdateOne) SetNumber(s string) *CardUpdateOne {
+	cuo.mutation.SetNumber(s)
+	return cuo
+}
+
+// Mutation returns the CardMutation object of the builder.
+func (cuo *CardUpdateOne) Mutation() *CardMutation {
+	return cuo.mutation
+}
+
+// Select allows selecting one or more fields (columns) of the returned entity.
+// The default is selecting all fields defined in the entity schema.
+func (cuo *CardUpdateOne) Select(field string, fields ...string) *CardUpdateOne {
+	cuo.fields = append([]string{field}, fields...)
+	return cuo
+}
+
+// Save executes the query and returns the updated Card entity.
+func (cuo *CardUpdateOne) Save(ctx context.Context) (*Card, error) {
+	return withHooks[*Card, CardMutation](ctx, cuo.sqlSave, cuo.mutation, cuo.hooks)
+}
+
+// SaveX is like Save, but panics if an error occurs.
+func (cuo *CardUpdateOne) SaveX(ctx context.Context) *Card {
+	node, err := cuo.Save(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return node
+}
+
+// Exec executes the query on the entity.
+func (cuo *CardUpdateOne) Exec(ctx context.Context) error {
+	_, err := cuo.Save(ctx)
+	return err
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (cuo *CardUpdateOne) ExecX(ctx context.Context) {
+	if err := cuo.Exec(ctx); err != nil {
+		panic(err)
+	}
+}
+
+func (cuo *CardUpdateOne) sqlSave(ctx context.Context) (_node *Card, err error) {
+	_spec := &sqlgraph.UpdateSpec{
+		Node: &sqlgraph.NodeSpec{
+			Table:   card.Table,
+			Columns: card.Columns,
+			ID: &sqlgraph.FieldSpec{
+				Type:   field.TypeInt,
+				Column: card.FieldID,
+			},
+		},
+	}
+	id, ok := cuo.mutation.ID()
+	if !ok {
+		return nil, &ValidationError{Name: "id", err: errors.New(`ent: missing "Card.id" for update`)}
+	}
+	_spec.Node.ID.Value = id
+	if fields := cuo.fields; len(fields) > 0 {
+		_spec.Node.Columns = make([]string, 0, len(fields))
+		_spec.Node.Columns = append(_spec.Node.Columns, card.FieldID)
+		for _, f := range fields {
+			if !card.ValidColumn(f) {
+				return nil, &ValidationError{Name: f, err: fmt.Errorf("ent: invalid field %q for query", f)}
+			}
+			if f != card.FieldID {
+				_spec.Node.Columns = append(_spec.Node.Columns, f)
+			}
+		}
+	}
+	if ps := cuo.mutation.predicates; len(ps) > 0 {
+		_spec.Predicate = func(selector *sql.Selector) {
+			for i := range ps {
+				ps[i](selector)
+			}
+		}
+	}
+	if value, ok := cuo.mutation.Number(); ok {
+		_spec.SetField(card.FieldNumber, field.TypeString, value)
+	}
+	_node = &Card{config: cuo.config}
+	_spec.Assign = _node.assignValues
+	_spec.ScanValues = _node.scanValues
+	if err = sqlgraph.UpdateNode(ctx, cuo.driver, _spec); err != nil {
+		if _, ok := err.(*sqlgraph.NotFoundError); ok {
+			err = &NotFoundError{card.Label}
+		} else if sqlgraph.IsConstraintError(err) {
+			err = &ConstraintError{msg: err.Error(), wrap: err}
+		}
+		return nil, err
+	}
+	cuo.mutation.done = true
+	return _node, nil
+}
diff --git a/examples/jsonencode/ent/client.go b/examples/jsonencode/ent/client.go
index d8c613f0f..c1162a20e 100644
--- a/examples/jsonencode/ent/client.go
+++ b/examples/jsonencode/ent/client.go
@@ -14,6 +14,7 @@ import (
 
 	"entgo.io/ent/examples/jsonencode/ent/migrate"
 
+	"entgo.io/ent/examples/jsonencode/ent/card"
 	"entgo.io/ent/examples/jsonencode/ent/pet"
 	"entgo.io/ent/examples/jsonencode/ent/user"
 
@@ -27,6 +28,8 @@ type Client struct {
 	config
 	// Schema is the client for creating, migrating and dropping schema.
 	Schema *migrate.Schema
+	// Card is the client for interacting with the Card builders.
+	Card *CardClient
 	// Pet is the client for interacting with the Pet builders.
 	Pet *PetClient
 	// User is the client for interacting with the User builders.
@@ -44,6 +47,7 @@ func NewClient(opts ...Option) *Client {
 
 func (c *Client) init() {
 	c.Schema = migrate.NewSchema(c.driver)
+	c.Card = NewCardClient(c.config)
 	c.Pet = NewPetClient(c.config)
 	c.User = NewUserClient(c.config)
 }
@@ -79,6 +83,7 @@ func (c *Client) Tx(ctx context.Context) (*Tx, error) {
 	return &Tx{
 		ctx:    ctx,
 		config: cfg,
+		Card:   NewCardClient(cfg),
 		Pet:    NewPetClient(cfg),
 		User:   NewUserClient(cfg),
 	}, nil
@@ -100,6 +105,7 @@ func (c *Client) BeginTx(ctx context.Context, opts *sql.TxOptions) (*Tx, error)
 	return &Tx{
 		ctx:    ctx,
 		config: cfg,
+		Card:   NewCardClient(cfg),
 		Pet:    NewPetClient(cfg),
 		User:   NewUserClient(cfg),
 	}, nil
@@ -108,7 +114,7 @@ func (c *Client) BeginTx(ctx context.Context, opts *sql.TxOptions) (*Tx, error)
 // Debug returns a new debug-client. It's used to get verbose logging on specific operations.
 //
 //	client.Debug().
-//		Pet.
+//		Card.
 //		Query().
 //		Count(ctx)
 func (c *Client) Debug() *Client {
@@ -130,6 +136,7 @@ func (c *Client) Close() error {
 // Use adds the mutation hooks to all the entity clients.
 // In order to add hooks to a specific client, call: `client.Node.Use(...)`.
 func (c *Client) Use(hooks ...Hook) {
+	c.Card.Use(hooks...)
 	c.Pet.Use(hooks...)
 	c.User.Use(hooks...)
 }
@@ -137,6 +144,7 @@ func (c *Client) Use(hooks ...Hook) {
 // Intercept adds the query interceptors to all the entity clients.
 // In order to add interceptors to a specific client, call: `client.Node.Intercept(...)`.
 func (c *Client) Intercept(interceptors ...Interceptor) {
+	c.Card.Intercept(interceptors...)
 	c.Pet.Intercept(interceptors...)
 	c.User.Intercept(interceptors...)
 }
@@ -144,6 +152,8 @@ func (c *Client) Intercept(interceptors ...Interceptor) {
 // Mutate implements the ent.Mutator interface.
 func (c *Client) Mutate(ctx context.Context, m Mutation) (Value, error) {
 	switch m := m.(type) {
+	case *CardMutation:
+		return c.Card.mutate(ctx, m)
 	case *PetMutation:
 		return c.Pet.mutate(ctx, m)
 	case *UserMutation:
@@ -153,6 +163,123 @@ func (c *Client) Mutate(ctx context.Context, m Mutation) (Value, error) {
 	}
 }
 
+// CardClient is a client for the Card schema.
+type CardClient struct {
+	config
+}
+
+// NewCardClient returns a client for the Card from the given config.
+func NewCardClient(c config) *CardClient {
+	return &CardClient{config: c}
+}
+
+// Use adds a list of mutation hooks to the hooks stack.
+// A call to `Use(f, g, h)` equals to `card.Hooks(f(g(h())))`.
+func (c *CardClient) Use(hooks ...Hook) {
+	c.hooks.Card = append(c.hooks.Card, hooks...)
+}
+
+// Use adds a list of query interceptors to the interceptors stack.
+// A call to `Intercept(f, g, h)` equals to `card.Intercept(f(g(h())))`.
+func (c *CardClient) Intercept(interceptors ...Interceptor) {
+	c.inters.Card = append(c.inters.Card, interceptors...)
+}
+
+// Create returns a builder for creating a Card entity.
+func (c *CardClient) Create() *CardCreate {
+	mutation := newCardMutation(c.config, OpCreate)
+	return &CardCreate{config: c.config, hooks: c.Hooks(), mutation: mutation}
+}
+
+// CreateBulk returns a builder for creating a bulk of Card entities.
+func (c *CardClient) CreateBulk(builders ...*CardCreate) *CardCreateBulk {
+	return &CardCreateBulk{config: c.config, builders: builders}
+}
+
+// Update returns an update builder for Card.
+func (c *CardClient) Update() *CardUpdate {
+	mutation := newCardMutation(c.config, OpUpdate)
+	return &CardUpdate{config: c.config, hooks: c.Hooks(), mutation: mutation}
+}
+
+// UpdateOne returns an update builder for the given entity.
+func (c *CardClient) UpdateOne(ca *Card) *CardUpdateOne {
+	mutation := newCardMutation(c.config, OpUpdateOne, withCard(ca))
+	return &CardUpdateOne{config: c.config, hooks: c.Hooks(), mutation: mutation}
+}
+
+// UpdateOneID returns an update builder for the given id.
+func (c *CardClient) UpdateOneID(id int) *CardUpdateOne {
+	mutation := newCardMutation(c.config, OpUpdateOne, withCardID(id))
+	return &CardUpdateOne{config: c.config, hooks: c.Hooks(), mutation: mutation}
+}
+
+// Delete returns a delete builder for Card.
+func (c *CardClient) Delete() *CardDelete {
+	mutation := newCardMutation(c.config, OpDelete)
+	return &CardDelete{config: c.config, hooks: c.Hooks(), mutation: mutation}
+}
+
+// DeleteOne returns a builder for deleting the given entity.
+func (c *CardClient) DeleteOne(ca *Card) *CardDeleteOne {
+	return c.DeleteOneID(ca.ID)
+}
+
+// DeleteOneID returns a builder for deleting the given entity by its id.
+func (c *CardClient) DeleteOneID(id int) *CardDeleteOne {
+	builder := c.Delete().Where(card.ID(id))
+	builder.mutation.id = &id
+	builder.mutation.op = OpDeleteOne
+	return &CardDeleteOne{builder}
+}
+
+// Query returns a query builder for Card.
+func (c *CardClient) Query() *CardQuery {
+	return &CardQuery{
+		config: c.config,
+		inters: c.Interceptors(),
+	}
+}
+
+// Get returns a Card entity by its id.
+func (c *CardClient) Get(ctx context.Context, id int) (*Card, error) {
+	return c.Query().Where(card.ID(id)).Only(ctx)
+}
+
+// GetX is like Get, but panics if an error occurs.
+func (c *CardClient) GetX(ctx context.Context, id int) *Card {
+	obj, err := c.Get(ctx, id)
+	if err != nil {
+		panic(err)
+	}
+	return obj
+}
+
+// Hooks returns the client hooks.
+func (c *CardClient) Hooks() []Hook {
+	return c.hooks.Card
+}
+
+// Interceptors returns the client interceptors.
+func (c *CardClient) Interceptors() []Interceptor {
+	return c.inters.Card
+}
+
+func (c *CardClient) mutate(ctx context.Context, m *CardMutation) (Value, error) {
+	switch m.Op() {
+	case OpCreate:
+		return (&CardCreate{config: c.config, hooks: c.Hooks(), mutation: m}).Save(ctx)
+	case OpUpdate:
+		return (&CardUpdate{config: c.config, hooks: c.Hooks(), mutation: m}).Save(ctx)
+	case OpUpdateOne:
+		return (&CardUpdateOne{config: c.config, hooks: c.Hooks(), mutation: m}).Save(ctx)
+	case OpDelete, OpDeleteOne:
+		return (&CardDelete{config: c.config, hooks: c.Hooks(), mutation: m}).Exec(ctx)
+	default:
+		return nil, fmt.Errorf("ent: unknown Card mutation op: %q", m.Op())
+	}
+}
+
 // PetClient is a client for the Pet schema.
 type PetClient struct {
 	config
diff --git a/examples/jsonencode/ent/config.go b/examples/jsonencode/ent/config.go
index aedf548be..e47670013 100644
--- a/examples/jsonencode/ent/config.go
+++ b/examples/jsonencode/ent/config.go
@@ -31,10 +31,12 @@ type config struct {
 // hooks and interceptors per client, for fast access.
 type (
 	hooks struct {
+		Card []ent.Hook
 		Pet  []ent.Hook
 		User []ent.Hook
 	}
 	inters struct {
+		Card []ent.Interceptor
 		Pet  []ent.Interceptor
 		User []ent.Interceptor
 	}
diff --git a/examples/jsonencode/ent/ent.go b/examples/jsonencode/ent/ent.go
index 344fd56d0..24beb90f0 100644
--- a/examples/jsonencode/ent/ent.go
+++ b/examples/jsonencode/ent/ent.go
@@ -15,6 +15,7 @@ import (
 	"entgo.io/ent"
 	"entgo.io/ent/dialect/sql"
 	"entgo.io/ent/dialect/sql/sqlgraph"
+	"entgo.io/ent/examples/jsonencode/ent/card"
 	"entgo.io/ent/examples/jsonencode/ent/pet"
 	"entgo.io/ent/examples/jsonencode/ent/user"
 )
@@ -43,6 +44,7 @@ type OrderFunc func(*sql.Selector)
 // columnChecker returns a function indicates if the column exists in the given column.
 func columnChecker(table string) func(string) error {
 	checks := map[string]func(string) bool{
+		card.Table: card.ValidColumn,
 		pet.Table:  pet.ValidColumn,
 		user.Table: user.ValidColumn,
 	}
diff --git a/examples/jsonencode/ent/entc.go b/examples/jsonencode/ent/entc.go
index 5e7984bf5..2b5227e77 100644
--- a/examples/jsonencode/ent/entc.go
+++ b/examples/jsonencode/ent/entc.go
@@ -46,17 +46,19 @@ func (e *EncodeExtension) Templates() []*gen.Template {
 	return []*gen.Template{
 		gen.MustParse(gen.NewTemplate("model/additional/jsonencode").
 			Parse(`
-// MarshalJSON implements the json.Marshaler interface.
-func ({{ $.Receiver }} *{{ $.Name }}) MarshalJSON() ([]byte, error) {
-	type Alias {{ $.Name }}
-	return json.Marshal(&struct {
-		*Alias
-		{{ $.Name }}Edges
-	}{
-		Alias: (*Alias)({{ $.Receiver }}),
-		{{ $.Name }}Edges: {{ $.Receiver }}.Edges,
-	})
-}
+{{ if $.Edges }}
+	// MarshalJSON implements the json.Marshaler interface.
+	func ({{ $.Receiver }} *{{ $.Name }}) MarshalJSON() ([]byte, error) {
+		type Alias {{ $.Name }}
+		return json.Marshal(&struct {
+			*Alias
+			{{ $.Name }}Edges
+		}{
+			Alias: (*Alias)({{ $.Receiver }}),
+			{{ $.Name }}Edges: {{ $.Receiver }}.Edges,
+		})
+	}
+{{ end }}
 `)),
 	}
 }
diff --git a/examples/jsonencode/ent/hook/hook.go b/examples/jsonencode/ent/hook/hook.go
index 970861a81..e0db1bc7e 100644
--- a/examples/jsonencode/ent/hook/hook.go
+++ b/examples/jsonencode/ent/hook/hook.go
@@ -13,6 +13,18 @@ import (
 	"entgo.io/ent/examples/jsonencode/ent"
 )
 
+// The CardFunc type is an adapter to allow the use of ordinary
+// function as Card mutator.
+type CardFunc func(context.Context, *ent.CardMutation) (ent.Value, error)
+
+// Mutate calls f(ctx, m).
+func (f CardFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
+	if mv, ok := m.(*ent.CardMutation); ok {
+		return f(ctx, mv)
+	}
+	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.CardMutation", m)
+}
+
 // The PetFunc type is an adapter to allow the use of ordinary
 // function as Pet mutator.
 type PetFunc func(context.Context, *ent.PetMutation) (ent.Value, error)
diff --git a/examples/jsonencode/ent/migrate/schema.go b/examples/jsonencode/ent/migrate/schema.go
index d5c4a1647..c54cd4f8d 100644
--- a/examples/jsonencode/ent/migrate/schema.go
+++ b/examples/jsonencode/ent/migrate/schema.go
@@ -12,6 +12,17 @@ import (
 )
 
 var (
+	// CardsColumns holds the columns for the "cards" table.
+	CardsColumns = []*schema.Column{
+		{Name: "id", Type: field.TypeInt, Increment: true},
+		{Name: "number", Type: field.TypeString},
+	}
+	// CardsTable holds the schema information for the "cards" table.
+	CardsTable = &schema.Table{
+		Name:       "cards",
+		Columns:    CardsColumns,
+		PrimaryKey: []*schema.Column{CardsColumns[0]},
+	}
 	// PetsColumns holds the columns for the "pets" table.
 	PetsColumns = []*schema.Column{
 		{Name: "id", Type: field.TypeInt, Increment: true},
@@ -47,6 +58,7 @@ var (
 	}
 	// Tables holds all the tables in the schema.
 	Tables = []*schema.Table{
+		CardsTable,
 		PetsTable,
 		UsersTable,
 	}
diff --git a/examples/jsonencode/ent/mutation.go b/examples/jsonencode/ent/mutation.go
index e843c735a..493b4dea7 100644
--- a/examples/jsonencode/ent/mutation.go
+++ b/examples/jsonencode/ent/mutation.go
@@ -13,6 +13,7 @@ import (
 	"sync"
 
 	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/examples/jsonencode/ent/card"
 	"entgo.io/ent/examples/jsonencode/ent/pet"
 	"entgo.io/ent/examples/jsonencode/ent/predicate"
 	"entgo.io/ent/examples/jsonencode/ent/user"
@@ -29,10 +30,337 @@ const (
 	OpUpdateOne = ent.OpUpdateOne
 
 	// Node types.
+	TypeCard = "Card"
 	TypePet  = "Pet"
 	TypeUser = "User"
 )
 
+// CardMutation represents an operation that mutates the Card nodes in the graph.
+type CardMutation struct {
+	config
+	op            Op
+	typ           string
+	id            *int
+	number        *string
+	clearedFields map[string]struct{}
+	done          bool
+	oldValue      func(context.Context) (*Card, error)
+	predicates    []predicate.Card
+}
+
+var _ ent.Mutation = (*CardMutation)(nil)
+
+// cardOption allows management of the mutation configuration using functional options.
+type cardOption func(*CardMutation)
+
+// newCardMutation creates new mutation for the Card entity.
+func newCardMutation(c config, op Op, opts ...cardOption) *CardMutation {
+	m := &CardMutation{
+		config:        c,
+		op:            op,
+		typ:           TypeCard,
+		clearedFields: make(map[string]struct{}),
+	}
+	for _, opt := range opts {
+		opt(m)
+	}
+	return m
+}
+
+// withCardID sets the ID field of the mutation.
+func withCardID(id int) cardOption {
+	return func(m *CardMutation) {
+		var (
+			err   error
+			once  sync.Once
+			value *Card
+		)
+		m.oldValue = func(ctx context.Context) (*Card, error) {
+			once.Do(func() {
+				if m.done {
+					err = errors.New("querying old values post mutation is not allowed")
+				} else {
+					value, err = m.Client().Card.Get(ctx, id)
+				}
+			})
+			return value, err
+		}
+		m.id = &id
+	}
+}
+
+// withCard sets the old Card of the mutation.
+func withCard(node *Card) cardOption {
+	return func(m *CardMutation) {
+		m.oldValue = func(context.Context) (*Card, error) {
+			return node, nil
+		}
+		m.id = &node.ID
+	}
+}
+
+// Client returns a new `ent.Client` from the mutation. If the mutation was
+// executed in a transaction (ent.Tx), a transactional client is returned.
+func (m CardMutation) Client() *Client {
+	client := &Client{config: m.config}
+	client.init()
+	return client
+}
+
+// Tx returns an `ent.Tx` for mutations that were executed in transactions;
+// it returns an error otherwise.
+func (m CardMutation) Tx() (*Tx, error) {
+	if _, ok := m.driver.(*txDriver); !ok {
+		return nil, errors.New("ent: mutation is not running in a transaction")
+	}
+	tx := &Tx{config: m.config}
+	tx.init()
+	return tx, nil
+}
+
+// ID returns the ID value in the mutation. Note that the ID is only available
+// if it was provided to the builder or after it was returned from the database.
+func (m *CardMutation) ID() (id int, exists bool) {
+	if m.id == nil {
+		return
+	}
+	return *m.id, true
+}
+
+// IDs queries the database and returns the entity ids that match the mutation's predicate.
+// That means, if the mutation is applied within a transaction with an isolation level such
+// as sql.LevelSerializable, the returned ids match the ids of the rows that will be updated
+// or updated by the mutation.
+func (m *CardMutation) IDs(ctx context.Context) ([]int, error) {
+	switch {
+	case m.op.Is(OpUpdateOne | OpDeleteOne):
+		id, exists := m.ID()
+		if exists {
+			return []int{id}, nil
+		}
+		fallthrough
+	case m.op.Is(OpUpdate | OpDelete):
+		return m.Client().Card.Query().Where(m.predicates...).IDs(ctx)
+	default:
+		return nil, fmt.Errorf("IDs is not allowed on %s operations", m.op)
+	}
+}
+
+// SetNumber sets the "number" field.
+func (m *CardMutation) SetNumber(s string) {
+	m.number = &s
+}
+
+// Number returns the value of the "number" field in the mutation.
+func (m *CardMutation) Number() (r string, exists bool) {
+	v := m.number
+	if v == nil {
+		return
+	}
+	return *v, true
+}
+
+// OldNumber returns the old "number" field's value of the Card entity.
+// If the Card object wasn't provided to the builder, the object is fetched from the database.
+// An error is returned if the mutation operation is not UpdateOne, or the database query fails.
+func (m *CardMutation) OldNumber(ctx context.Context) (v string, err error) {
+	if !m.op.Is(OpUpdateOne) {
+		return v, errors.New("OldNumber is only allowed on UpdateOne operations")
+	}
+	if m.id == nil || m.oldValue == nil {
+		return v, errors.New("OldNumber requires an ID field in the mutation")
+	}
+	oldValue, err := m.oldValue(ctx)
+	if err != nil {
+		return v, fmt.Errorf("querying old value for OldNumber: %w", err)
+	}
+	return oldValue.Number, nil
+}
+
+// ResetNumber resets all changes to the "number" field.
+func (m *CardMutation) ResetNumber() {
+	m.number = nil
+}
+
+// Where appends a list predicates to the CardMutation builder.
+func (m *CardMutation) Where(ps ...predicate.Card) {
+	m.predicates = append(m.predicates, ps...)
+}
+
+// WhereP appends storage-level predicates to the CardMutation builder. Using this method,
+// users can use type-assertion to append predicates that do not depend on any generated package.
+func (m *CardMutation) WhereP(ps ...func(*sql.Selector)) {
+	p := make([]predicate.Card, len(ps))
+	for i := range ps {
+		p[i] = ps[i]
+	}
+	m.Where(p...)
+}
+
+// Op returns the operation name.
+func (m *CardMutation) Op() Op {
+	return m.op
+}
+
+// SetOp allows setting the mutation operation.
+func (m *CardMutation) SetOp(op Op) {
+	m.op = op
+}
+
+// Type returns the node type of this mutation (Card).
+func (m *CardMutation) Type() string {
+	return m.typ
+}
+
+// Fields returns all fields that were changed during this mutation. Note that in
+// order to get all numeric fields that were incremented/decremented, call
+// AddedFields().
+func (m *CardMutation) Fields() []string {
+	fields := make([]string, 0, 1)
+	if m.number != nil {
+		fields = append(fields, card.FieldNumber)
+	}
+	return fields
+}
+
+// Field returns the value of a field with the given name. The second boolean
+// return value indicates that this field was not set, or was not defined in the
+// schema.
+func (m *CardMutation) Field(name string) (ent.Value, bool) {
+	switch name {
+	case card.FieldNumber:
+		return m.Number()
+	}
+	return nil, false
+}
+
+// OldField returns the old value of the field from the database. An error is
+// returned if the mutation operation is not UpdateOne, or the query to the
+// database failed.
+func (m *CardMutation) OldField(ctx context.Context, name string) (ent.Value, error) {
+	switch name {
+	case card.FieldNumber:
+		return m.OldNumber(ctx)
+	}
+	return nil, fmt.Errorf("unknown Card field %s", name)
+}
+
+// SetField sets the value of a field with the given name. It returns an error if
+// the field is not defined in the schema, or if the type mismatched the field
+// type.
+func (m *CardMutation) SetField(name string, value ent.Value) error {
+	switch name {
+	case card.FieldNumber:
+		v, ok := value.(string)
+		if !ok {
+			return fmt.Errorf("unexpected type %T for field %s", value, name)
+		}
+		m.SetNumber(v)
+		return nil
+	}
+	return fmt.Errorf("unknown Card field %s", name)
+}
+
+// AddedFields returns all numeric fields that were incremented/decremented during
+// this mutation.
+func (m *CardMutation) AddedFields() []string {
+	return nil
+}
+
+// AddedField returns the numeric value that was incremented/decremented on a field
+// with the given name. The second boolean return value indicates that this field
+// was not set, or was not defined in the schema.
+func (m *CardMutation) AddedField(name string) (ent.Value, bool) {
+	return nil, false
+}
+
+// AddField adds the value to the field with the given name. It returns an error if
+// the field is not defined in the schema, or if the type mismatched the field
+// type.
+func (m *CardMutation) AddField(name string, value ent.Value) error {
+	switch name {
+	}
+	return fmt.Errorf("unknown Card numeric field %s", name)
+}
+
+// ClearedFields returns all nullable fields that were cleared during this
+// mutation.
+func (m *CardMutation) ClearedFields() []string {
+	return nil
+}
+
+// FieldCleared returns a boolean indicating if a field with the given name was
+// cleared in this mutation.
+func (m *CardMutation) FieldCleared(name string) bool {
+	_, ok := m.clearedFields[name]
+	return ok
+}
+
+// ClearField clears the value of the field with the given name. It returns an
+// error if the field is not defined in the schema.
+func (m *CardMutation) ClearField(name string) error {
+	return fmt.Errorf("unknown Card nullable field %s", name)
+}
+
+// ResetField resets all changes in the mutation for the field with the given name.
+// It returns an error if the field is not defined in the schema.
+func (m *CardMutation) ResetField(name string) error {
+	switch name {
+	case card.FieldNumber:
+		m.ResetNumber()
+		return nil
+	}
+	return fmt.Errorf("unknown Card field %s", name)
+}
+
+// AddedEdges returns all edge names that were set/added in this mutation.
+func (m *CardMutation) AddedEdges() []string {
+	edges := make([]string, 0, 0)
+	return edges
+}
+
+// AddedIDs returns all IDs (to other nodes) that were added for the given edge
+// name in this mutation.
+func (m *CardMutation) AddedIDs(name string) []ent.Value {
+	return nil
+}
+
+// RemovedEdges returns all edge names that were removed in this mutation.
+func (m *CardMutation) RemovedEdges() []string {
+	edges := make([]string, 0, 0)
+	return edges
+}
+
+// RemovedIDs returns all IDs (to other nodes) that were removed for the edge with
+// the given name in this mutation.
+func (m *CardMutation) RemovedIDs(name string) []ent.Value {
+	return nil
+}
+
+// ClearedEdges returns all edge names that were cleared in this mutation.
+func (m *CardMutation) ClearedEdges() []string {
+	edges := make([]string, 0, 0)
+	return edges
+}
+
+// EdgeCleared returns a boolean which indicates if the edge with the given name
+// was cleared in this mutation.
+func (m *CardMutation) EdgeCleared(name string) bool {
+	return false
+}
+
+// ClearEdge clears the value of the edge with the given name. It returns an error
+// if that edge is not defined in the schema.
+func (m *CardMutation) ClearEdge(name string) error {
+	return fmt.Errorf("unknown Card unique edge %s", name)
+}
+
+// ResetEdge resets all changes to the edge with the given name in this mutation.
+// It returns an error if the edge is not defined in the schema.
+func (m *CardMutation) ResetEdge(name string) error {
+	return fmt.Errorf("unknown Card edge %s", name)
+}
+
 // PetMutation represents an operation that mutates the Pet nodes in the graph.
 type PetMutation struct {
 	config
diff --git a/examples/jsonencode/ent/predicate/predicate.go b/examples/jsonencode/ent/predicate/predicate.go
index d5564c88b..ddca2ed7e 100644
--- a/examples/jsonencode/ent/predicate/predicate.go
+++ b/examples/jsonencode/ent/predicate/predicate.go
@@ -10,6 +10,9 @@ import (
 	"entgo.io/ent/dialect/sql"
 )
 
+// Card is the predicate function for card builders.
+type Card func(*sql.Selector)
+
 // Pet is the predicate function for pet builders.
 type Pet func(*sql.Selector)
 
diff --git a/examples/jsonencode/ent/schema/card.go b/examples/jsonencode/ent/schema/card.go
new file mode 100644
index 000000000..87bcbf4f5
--- /dev/null
+++ b/examples/jsonencode/ent/schema/card.go
@@ -0,0 +1,22 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+package schema
+
+import (
+	"entgo.io/ent"
+	"entgo.io/ent/schema/field"
+)
+
+// Card holds the schema definition for the Card entity.
+type Card struct {
+	ent.Schema
+}
+
+// Fields of the Card.
+func (Card) Fields() []ent.Field {
+	return []ent.Field{
+		field.String("number"),
+	}
+}
diff --git a/examples/jsonencode/ent/tx.go b/examples/jsonencode/ent/tx.go
index 059a11d71..9c56c5101 100644
--- a/examples/jsonencode/ent/tx.go
+++ b/examples/jsonencode/ent/tx.go
@@ -16,6 +16,8 @@ import (
 // Tx is a transactional client that is created by calling Client.Tx().
 type Tx struct {
 	config
+	// Card is the client for interacting with the Card builders.
+	Card *CardClient
 	// Pet is the client for interacting with the Pet builders.
 	Pet *PetClient
 	// User is the client for interacting with the User builders.
@@ -151,6 +153,7 @@ func (tx *Tx) Client() *Client {
 }
 
 func (tx *Tx) init() {
+	tx.Card = NewCardClient(tx.config)
 	tx.Pet = NewPetClient(tx.config)
 	tx.User = NewUserClient(tx.config)
 }
@@ -162,7 +165,7 @@ func (tx *Tx) init() {
 // of them in order to commit or rollback the transaction.
 //
 // If a closed transaction is embedded in one of the generated entities, and the entity
-// applies a query, for example: Pet.QueryXXX(), the query will be executed
+// applies a query, for example: Card.QueryXXX(), the query will be executed
 // through the driver which created this transaction.
 //
 // Note that txDriver is not goroutine safe.