ent/entc/integration/gremlin/ent/task_query.go

// 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 entc, DO NOT EDIT.

package ent

import (
	"context"
	"errors"
	"fmt"
	"math"

	"entgo.io/ent/dialect/gremlin"
	"entgo.io/ent/dialect/gremlin/graph/dsl"
	"entgo.io/ent/dialect/gremlin/graph/dsl/__"
	"entgo.io/ent/dialect/gremlin/graph/dsl/g"
	"entgo.io/ent/entc/integration/gremlin/ent/predicate"

	enttask "entgo.io/ent/entc/integration/gremlin/ent/task"
)

// TaskQuery is the builder for querying Task entities.
type TaskQuery struct {
	config
	limit      *int
	offset     *int
	unique     *bool
	order      []OrderFunc
	fields     []string
	predicates []predicate.Task
	// intermediate query (i.e. traversal path).
	gremlin *dsl.Traversal
	path    func(context.Context) (*dsl.Traversal, error)
}

// Where adds a new predicate for the TaskQuery builder.
func (tq *TaskQuery) Where(ps ...predicate.Task) *TaskQuery {
	tq.predicates = append(tq.predicates, ps...)
	return tq
}

// Limit adds a limit step to the query.
func (tq *TaskQuery) Limit(limit int) *TaskQuery {
	tq.limit = &limit
	return tq
}

// Offset adds an offset step to the query.
func (tq *TaskQuery) Offset(offset int) *TaskQuery {
	tq.offset = &offset
	return tq
}

// 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 (tq *TaskQuery) Unique(unique bool) *TaskQuery {
	tq.unique = &unique
	return tq
}

// Order adds an order step to the query.
func (tq *TaskQuery) Order(o ...OrderFunc) *TaskQuery {
	tq.order = append(tq.order, o...)
	return tq
}

// First returns the first Task entity from the query.
// Returns a *NotFoundError when no Task was found.
func (tq *TaskQuery) First(ctx context.Context) (*Task, error) {
	nodes, err := tq.Limit(1).All(ctx)
	if err != nil {
		return nil, err
	}
	if len(nodes) == 0 {
		return nil, &NotFoundError{enttask.Label}
	}
	return nodes[0], nil
}

// FirstX is like First, but panics if an error occurs.
func (tq *TaskQuery) FirstX(ctx context.Context) *Task {
	node, err := tq.First(ctx)
	if err != nil && !IsNotFound(err) {
		panic(err)
	}
	return node
}

// FirstID returns the first Task ID from the query.
// Returns a *NotFoundError when no Task ID was found.
func (tq *TaskQuery) FirstID(ctx context.Context) (id string, err error) {
	var ids []string
	if ids, err = tq.Limit(1).IDs(ctx); err != nil {
		return
	}
	if len(ids) == 0 {
		err = &NotFoundError{enttask.Label}
		return
	}
	return ids[0], nil
}

// FirstIDX is like FirstID, but panics if an error occurs.
func (tq *TaskQuery) FirstIDX(ctx context.Context) string {
	id, err := tq.FirstID(ctx)
	if err != nil && !IsNotFound(err) {
		panic(err)
	}
	return id
}

// Only returns a single Task entity found by the query, ensuring it only returns one.
// Returns a *NotSingularError when more than one Task entity is found.
// Returns a *NotFoundError when no Task entities are found.
func (tq *TaskQuery) Only(ctx context.Context) (*Task, error) {
	nodes, err := tq.Limit(2).All(ctx)
	if err != nil {
		return nil, err
	}
	switch len(nodes) {
	case 1:
		return nodes[0], nil
	case 0:
		return nil, &NotFoundError{enttask.Label}
	default:
		return nil, &NotSingularError{enttask.Label}
	}
}

// OnlyX is like Only, but panics if an error occurs.
func (tq *TaskQuery) OnlyX(ctx context.Context) *Task {
	node, err := tq.Only(ctx)
	if err != nil {
		panic(err)
	}
	return node
}

// OnlyID is like Only, but returns the only Task ID in the query.
// Returns a *NotSingularError when more than one Task ID is found.
// Returns a *NotFoundError when no entities are found.
func (tq *TaskQuery) OnlyID(ctx context.Context) (id string, err error) {
	var ids []string
	if ids, err = tq.Limit(2).IDs(ctx); err != nil {
		return
	}
	switch len(ids) {
	case 1:
		id = ids[0]
	case 0:
		err = &NotFoundError{enttask.Label}
	default:
		err = &NotSingularError{enttask.Label}
	}
	return
}

// OnlyIDX is like OnlyID, but panics if an error occurs.
func (tq *TaskQuery) OnlyIDX(ctx context.Context) string {
	id, err := tq.OnlyID(ctx)
	if err != nil {
		panic(err)
	}
	return id
}

// All executes the query and returns a list of Tasks.
func (tq *TaskQuery) All(ctx context.Context) ([]*Task, error) {
	if err := tq.prepareQuery(ctx); err != nil {
		return nil, err
	}
	return tq.gremlinAll(ctx)
}

// AllX is like All, but panics if an error occurs.
func (tq *TaskQuery) AllX(ctx context.Context) []*Task {
	nodes, err := tq.All(ctx)
	if err != nil {
		panic(err)
	}
	return nodes
}

// IDs executes the query and returns a list of Task IDs.
func (tq *TaskQuery) IDs(ctx context.Context) ([]string, error) {
	var ids []string
	if err := tq.Select(enttask.FieldID).Scan(ctx, &ids); err != nil {
		return nil, err
	}
	return ids, nil
}

// IDsX is like IDs, but panics if an error occurs.
func (tq *TaskQuery) IDsX(ctx context.Context) []string {
	ids, err := tq.IDs(ctx)
	if err != nil {
		panic(err)
	}
	return ids
}

// Count returns the count of the given query.
func (tq *TaskQuery) Count(ctx context.Context) (int, error) {
	if err := tq.prepareQuery(ctx); err != nil {
		return 0, err
	}
	return tq.gremlinCount(ctx)
}

// CountX is like Count, but panics if an error occurs.
func (tq *TaskQuery) CountX(ctx context.Context) int {
	count, err := tq.Count(ctx)
	if err != nil {
		panic(err)
	}
	return count
}

// Exist returns true if the query has elements in the graph.
func (tq *TaskQuery) Exist(ctx context.Context) (bool, error) {
	if err := tq.prepareQuery(ctx); err != nil {
		return false, err
	}
	return tq.gremlinExist(ctx)
}

// ExistX is like Exist, but panics if an error occurs.
func (tq *TaskQuery) ExistX(ctx context.Context) bool {
	exist, err := tq.Exist(ctx)
	if err != nil {
		panic(err)
	}
	return exist
}

// Clone returns a duplicate of the TaskQuery builder, including all associated steps. It can be
// used to prepare common query builders and use them differently after the clone is made.
func (tq *TaskQuery) Clone() *TaskQuery {
	if tq == nil {
		return nil
	}
	return &TaskQuery{
		config:     tq.config,
		limit:      tq.limit,
		offset:     tq.offset,
		order:      append([]OrderFunc{}, tq.order...),
		predicates: append([]predicate.Task{}, tq.predicates...),
		// clone intermediate query.
		gremlin: tq.gremlin.Clone(),
		path:    tq.path,
	}
}

// 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 {
//		Priority task.Priority `json:"priority,omitempty"`
//		Count int `json:"count,omitempty"`
//	}
//
//	client.Task.Query().
//		GroupBy(enttask.FieldPriority).
//		Aggregate(ent.Count()).
//		Scan(ctx, &v)
//
func (tq *TaskQuery) GroupBy(field string, fields ...string) *TaskGroupBy {
	group := &TaskGroupBy{config: tq.config}
	group.fields = append([]string{field}, fields...)
	group.path = func(ctx context.Context) (prev *dsl.Traversal, err error) {
		if err := tq.prepareQuery(ctx); err != nil {
			return nil, err
		}
		return tq.gremlinQuery(ctx), nil
	}
	return group
}

// 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 {
//		Priority task.Priority `json:"priority,omitempty"`
//	}
//
//	client.Task.Query().
//		Select(enttask.FieldPriority).
//		Scan(ctx, &v)
//
func (tq *TaskQuery) Select(fields ...string) *TaskSelect {
	tq.fields = append(tq.fields, fields...)
	return &TaskSelect{TaskQuery: tq}
}

func (tq *TaskQuery) prepareQuery(ctx context.Context) error {
	if tq.path != nil {
		prev, err := tq.path(ctx)
		if err != nil {
			return err
		}
		tq.gremlin = prev
	}
	return nil
}

func (tq *TaskQuery) gremlinAll(ctx context.Context) ([]*Task, error) {
	res := &gremlin.Response{}
	traversal := tq.gremlinQuery(ctx)
	if len(tq.fields) > 0 {
		fields := make([]interface{}, len(tq.fields))
		for i, f := range tq.fields {
			fields[i] = f
		}
		traversal.ValueMap(fields...)
	} else {
		traversal.ValueMap(true)
	}
	query, bindings := traversal.Query()
	if err := tq.driver.Exec(ctx, query, bindings, res); err != nil {
		return nil, err
	}
	var ts Tasks
	if err := ts.FromResponse(res); err != nil {
		return nil, err
	}
	ts.config(tq.config)
	return ts, nil
}

func (tq *TaskQuery) gremlinCount(ctx context.Context) (int, error) {
	res := &gremlin.Response{}
	query, bindings := tq.gremlinQuery(ctx).Count().Query()
	if err := tq.driver.Exec(ctx, query, bindings, res); err != nil {
		return 0, err
	}
	return res.ReadInt()
}

func (tq *TaskQuery) gremlinExist(ctx context.Context) (bool, error) {
	res := &gremlin.Response{}
	query, bindings := tq.gremlinQuery(ctx).HasNext().Query()
	if err := tq.driver.Exec(ctx, query, bindings, res); err != nil {
		return false, err
	}
	return res.ReadBool()
}

func (tq *TaskQuery) gremlinQuery(context.Context) *dsl.Traversal {
	v := g.V().HasLabel(enttask.Label)
	if tq.gremlin != nil {
		v = tq.gremlin.Clone()
	}
	for _, p := range tq.predicates {
		p(v)
	}
	if len(tq.order) > 0 {
		v.Order()
		for _, p := range tq.order {
			p(v)
		}
	}
	switch limit, offset := tq.limit, tq.offset; {
	case limit != nil && offset != nil:
		v.Range(*offset, *offset+*limit)
	case offset != nil:
		v.Range(*offset, math.MaxInt32)
	case limit != nil:
		v.Limit(*limit)
	}
	if unique := tq.unique; unique == nil || *unique {
		v.Dedup()
	}
	return v
}

// TaskGroupBy is the group-by builder for Task entities.
type TaskGroupBy struct {
	config
	fields []string
	fns    []AggregateFunc
	// intermediate query (i.e. traversal path).
	gremlin *dsl.Traversal
	path    func(context.Context) (*dsl.Traversal, error)
}

// Aggregate adds the given aggregation functions to the group-by query.
func (tgb *TaskGroupBy) Aggregate(fns ...AggregateFunc) *TaskGroupBy {
	tgb.fns = append(tgb.fns, fns...)
	return tgb
}

// Scan applies the group-by query and scans the result into the given value.
func (tgb *TaskGroupBy) Scan(ctx context.Context, v interface{}) error {
	query, err := tgb.path(ctx)
	if err != nil {
		return err
	}
	tgb.gremlin = query
	return tgb.gremlinScan(ctx, v)
}

// ScanX is like Scan, but panics if an error occurs.
func (tgb *TaskGroupBy) ScanX(ctx context.Context, v interface{}) {
	if err := tgb.Scan(ctx, v); err != nil {
		panic(err)
	}
}

// Strings returns list of strings from group-by.
// It is only allowed when executing a group-by query with one field.
func (tgb *TaskGroupBy) Strings(ctx context.Context) ([]string, error) {
	if len(tgb.fields) > 1 {
		return nil, errors.New("ent: TaskGroupBy.Strings is not achievable when grouping more than 1 field")
	}
	var v []string
	if err := tgb.Scan(ctx, &v); err != nil {
		return nil, err
	}
	return v, nil
}

// StringsX is like Strings, but panics if an error occurs.
func (tgb *TaskGroupBy) StringsX(ctx context.Context) []string {
	v, err := tgb.Strings(ctx)
	if err != nil {
		panic(err)
	}
	return v
}

// String returns a single string from a group-by query.
// It is only allowed when executing a group-by query with one field.
func (tgb *TaskGroupBy) String(ctx context.Context) (_ string, err error) {
	var v []string
	if v, err = tgb.Strings(ctx); err != nil {
		return
	}
	switch len(v) {
	case 1:
		return v[0], nil
	case 0:
		err = &NotFoundError{enttask.Label}
	default:
		err = fmt.Errorf("ent: TaskGroupBy.Strings returned %d results when one was expected", len(v))
	}
	return
}

// StringX is like String, but panics if an error occurs.
func (tgb *TaskGroupBy) StringX(ctx context.Context) string {
	v, err := tgb.String(ctx)
	if err != nil {
		panic(err)
	}
	return v
}

// Ints returns list of ints from group-by.
// It is only allowed when executing a group-by query with one field.
func (tgb *TaskGroupBy) Ints(ctx context.Context) ([]int, error) {
	if len(tgb.fields) > 1 {
		return nil, errors.New("ent: TaskGroupBy.Ints is not achievable when grouping more than 1 field")
	}
	var v []int
	if err := tgb.Scan(ctx, &v); err != nil {
		return nil, err
	}
	return v, nil
}

// IntsX is like Ints, but panics if an error occurs.
func (tgb *TaskGroupBy) IntsX(ctx context.Context) []int {
	v, err := tgb.Ints(ctx)
	if err != nil {
		panic(err)
	}
	return v
}

// Int returns a single int from a group-by query.
// It is only allowed when executing a group-by query with one field.
func (tgb *TaskGroupBy) Int(ctx context.Context) (_ int, err error) {
	var v []int
	if v, err = tgb.Ints(ctx); err != nil {
		return
	}
	switch len(v) {
	case 1:
		return v[0], nil
	case 0:
		err = &NotFoundError{enttask.Label}
	default:
		err = fmt.Errorf("ent: TaskGroupBy.Ints returned %d results when one was expected", len(v))
	}
	return
}

// IntX is like Int, but panics if an error occurs.
func (tgb *TaskGroupBy) IntX(ctx context.Context) int {
	v, err := tgb.Int(ctx)
	if err != nil {
		panic(err)
	}
	return v
}

// Float64s returns list of float64s from group-by.
// It is only allowed when executing a group-by query with one field.
func (tgb *TaskGroupBy) Float64s(ctx context.Context) ([]float64, error) {
	if len(tgb.fields) > 1 {
		return nil, errors.New("ent: TaskGroupBy.Float64s is not achievable when grouping more than 1 field")
	}
	var v []float64
	if err := tgb.Scan(ctx, &v); err != nil {
		return nil, err
	}
	return v, nil
}

// Float64sX is like Float64s, but panics if an error occurs.
func (tgb *TaskGroupBy) Float64sX(ctx context.Context) []float64 {
	v, err := tgb.Float64s(ctx)
	if err != nil {
		panic(err)
	}
	return v
}

// Float64 returns a single float64 from a group-by query.
// It is only allowed when executing a group-by query with one field.
func (tgb *TaskGroupBy) Float64(ctx context.Context) (_ float64, err error) {
	var v []float64
	if v, err = tgb.Float64s(ctx); err != nil {
		return
	}
	switch len(v) {
	case 1:
		return v[0], nil
	case 0:
		err = &NotFoundError{enttask.Label}
	default:
		err = fmt.Errorf("ent: TaskGroupBy.Float64s returned %d results when one was expected", len(v))
	}
	return
}

// Float64X is like Float64, but panics if an error occurs.
func (tgb *TaskGroupBy) Float64X(ctx context.Context) float64 {
	v, err := tgb.Float64(ctx)
	if err != nil {
		panic(err)
	}
	return v
}

// Bools returns list of bools from group-by.
// It is only allowed when executing a group-by query with one field.
func (tgb *TaskGroupBy) Bools(ctx context.Context) ([]bool, error) {
	if len(tgb.fields) > 1 {
		return nil, errors.New("ent: TaskGroupBy.Bools is not achievable when grouping more than 1 field")
	}
	var v []bool
	if err := tgb.Scan(ctx, &v); err != nil {
		return nil, err
	}
	return v, nil
}

// BoolsX is like Bools, but panics if an error occurs.
func (tgb *TaskGroupBy) BoolsX(ctx context.Context) []bool {
	v, err := tgb.Bools(ctx)
	if err != nil {
		panic(err)
	}
	return v
}

// Bool returns a single bool from a group-by query.
// It is only allowed when executing a group-by query with one field.
func (tgb *TaskGroupBy) Bool(ctx context.Context) (_ bool, err error) {
	var v []bool
	if v, err = tgb.Bools(ctx); err != nil {
		return
	}
	switch len(v) {
	case 1:
		return v[0], nil
	case 0:
		err = &NotFoundError{enttask.Label}
	default:
		err = fmt.Errorf("ent: TaskGroupBy.Bools returned %d results when one was expected", len(v))
	}
	return
}

// BoolX is like Bool, but panics if an error occurs.
func (tgb *TaskGroupBy) BoolX(ctx context.Context) bool {
	v, err := tgb.Bool(ctx)
	if err != nil {
		panic(err)
	}
	return v
}

func (tgb *TaskGroupBy) gremlinScan(ctx context.Context, v interface{}) error {
	res := &gremlin.Response{}
	query, bindings := tgb.gremlinQuery().Query()
	if err := tgb.driver.Exec(ctx, query, bindings, res); err != nil {
		return err
	}
	if len(tgb.fields)+len(tgb.fns) == 1 {
		return res.ReadVal(v)
	}
	vm, err := res.ReadValueMap()
	if err != nil {
		return err
	}
	return vm.Decode(v)
}

func (tgb *TaskGroupBy) gremlinQuery() *dsl.Traversal {
	var (
		trs   []interface{}
		names []interface{}
	)
	for _, fn := range tgb.fns {
		name, tr := fn("p", "")
		trs = append(trs, tr)
		names = append(names, name)
	}
	for _, f := range tgb.fields {
		names = append(names, f)
		trs = append(trs, __.As("p").Unfold().Values(f).As(f))
	}
	return tgb.gremlin.Group().
		By(__.Values(tgb.fields...).Fold()).
		By(__.Fold().Match(trs...).Select(names...)).
		Select(dsl.Values).
		Next()
}

// TaskSelect is the builder for selecting fields of Task entities.
type TaskSelect struct {
	*TaskQuery
	// intermediate query (i.e. traversal path).
	gremlin *dsl.Traversal
}

// Scan applies the selector query and scans the result into the given value.
func (ts *TaskSelect) Scan(ctx context.Context, v interface{}) error {
	if err := ts.prepareQuery(ctx); err != nil {
		return err
	}
	ts.gremlin = ts.TaskQuery.gremlinQuery(ctx)
	return ts.gremlinScan(ctx, v)
}

// ScanX is like Scan, but panics if an error occurs.
func (ts *TaskSelect) ScanX(ctx context.Context, v interface{}) {
	if err := ts.Scan(ctx, v); err != nil {
		panic(err)
	}
}

// Strings returns list of strings from a selector. It is only allowed when selecting one field.
func (ts *TaskSelect) Strings(ctx context.Context) ([]string, error) {
	if len(ts.fields) > 1 {
		return nil, errors.New("ent: TaskSelect.Strings is not achievable when selecting more than 1 field")
	}
	var v []string
	if err := ts.Scan(ctx, &v); err != nil {
		return nil, err
	}
	return v, nil
}

// StringsX is like Strings, but panics if an error occurs.
func (ts *TaskSelect) StringsX(ctx context.Context) []string {
	v, err := ts.Strings(ctx)
	if err != nil {
		panic(err)
	}
	return v
}

// String returns a single string from a selector. It is only allowed when selecting one field.
func (ts *TaskSelect) String(ctx context.Context) (_ string, err error) {
	var v []string
	if v, err = ts.Strings(ctx); err != nil {
		return
	}
	switch len(v) {
	case 1:
		return v[0], nil
	case 0:
		err = &NotFoundError{enttask.Label}
	default:
		err = fmt.Errorf("ent: TaskSelect.Strings returned %d results when one was expected", len(v))
	}
	return
}

// StringX is like String, but panics if an error occurs.
func (ts *TaskSelect) StringX(ctx context.Context) string {
	v, err := ts.String(ctx)
	if err != nil {
		panic(err)
	}
	return v
}

// Ints returns list of ints from a selector. It is only allowed when selecting one field.
func (ts *TaskSelect) Ints(ctx context.Context) ([]int, error) {
	if len(ts.fields) > 1 {
		return nil, errors.New("ent: TaskSelect.Ints is not achievable when selecting more than 1 field")
	}
	var v []int
	if err := ts.Scan(ctx, &v); err != nil {
		return nil, err
	}
	return v, nil
}

// IntsX is like Ints, but panics if an error occurs.
func (ts *TaskSelect) IntsX(ctx context.Context) []int {
	v, err := ts.Ints(ctx)
	if err != nil {
		panic(err)
	}
	return v
}

// Int returns a single int from a selector. It is only allowed when selecting one field.
func (ts *TaskSelect) Int(ctx context.Context) (_ int, err error) {
	var v []int
	if v, err = ts.Ints(ctx); err != nil {
		return
	}
	switch len(v) {
	case 1:
		return v[0], nil
	case 0:
		err = &NotFoundError{enttask.Label}
	default:
		err = fmt.Errorf("ent: TaskSelect.Ints returned %d results when one was expected", len(v))
	}
	return
}

// IntX is like Int, but panics if an error occurs.
func (ts *TaskSelect) IntX(ctx context.Context) int {
	v, err := ts.Int(ctx)
	if err != nil {
		panic(err)
	}
	return v
}

// Float64s returns list of float64s from a selector. It is only allowed when selecting one field.
func (ts *TaskSelect) Float64s(ctx context.Context) ([]float64, error) {
	if len(ts.fields) > 1 {
		return nil, errors.New("ent: TaskSelect.Float64s is not achievable when selecting more than 1 field")
	}
	var v []float64
	if err := ts.Scan(ctx, &v); err != nil {
		return nil, err
	}
	return v, nil
}

// Float64sX is like Float64s, but panics if an error occurs.
func (ts *TaskSelect) Float64sX(ctx context.Context) []float64 {
	v, err := ts.Float64s(ctx)
	if err != nil {
		panic(err)
	}
	return v
}

// Float64 returns a single float64 from a selector. It is only allowed when selecting one field.
func (ts *TaskSelect) Float64(ctx context.Context) (_ float64, err error) {
	var v []float64
	if v, err = ts.Float64s(ctx); err != nil {
		return
	}
	switch len(v) {
	case 1:
		return v[0], nil
	case 0:
		err = &NotFoundError{enttask.Label}
	default:
		err = fmt.Errorf("ent: TaskSelect.Float64s returned %d results when one was expected", len(v))
	}
	return
}

// Float64X is like Float64, but panics if an error occurs.
func (ts *TaskSelect) Float64X(ctx context.Context) float64 {
	v, err := ts.Float64(ctx)
	if err != nil {
		panic(err)
	}
	return v
}

// Bools returns list of bools from a selector. It is only allowed when selecting one field.
func (ts *TaskSelect) Bools(ctx context.Context) ([]bool, error) {
	if len(ts.fields) > 1 {
		return nil, errors.New("ent: TaskSelect.Bools is not achievable when selecting more than 1 field")
	}
	var v []bool
	if err := ts.Scan(ctx, &v); err != nil {
		return nil, err
	}
	return v, nil
}

// BoolsX is like Bools, but panics if an error occurs.
func (ts *TaskSelect) BoolsX(ctx context.Context) []bool {
	v, err := ts.Bools(ctx)
	if err != nil {
		panic(err)
	}
	return v
}

// Bool returns a single bool from a selector. It is only allowed when selecting one field.
func (ts *TaskSelect) Bool(ctx context.Context) (_ bool, err error) {
	var v []bool
	if v, err = ts.Bools(ctx); err != nil {
		return
	}
	switch len(v) {
	case 1:
		return v[0], nil
	case 0:
		err = &NotFoundError{enttask.Label}
	default:
		err = fmt.Errorf("ent: TaskSelect.Bools returned %d results when one was expected", len(v))
	}
	return
}

// BoolX is like Bool, but panics if an error occurs.
func (ts *TaskSelect) BoolX(ctx context.Context) bool {
	v, err := ts.Bool(ctx)
	if err != nil {
		panic(err)
	}
	return v
}

func (ts *TaskSelect) gremlinScan(ctx context.Context, v interface{}) error {
	var (
		traversal *dsl.Traversal
		res       = &gremlin.Response{}
	)
	if len(ts.fields) == 1 {
		if ts.fields[0] != enttask.FieldID {
			traversal = ts.gremlin.Values(ts.fields...)
		} else {
			traversal = ts.gremlin.ID()
		}
	} else {
		fields := make([]interface{}, len(ts.fields))
		for i, f := range ts.fields {
			fields[i] = f
		}
		traversal = ts.gremlin.ValueMap(fields...)
	}
	query, bindings := traversal.Query()
	if err := ts.driver.Exec(ctx, query, bindings, res); err != nil {
		return err
	}
	if len(ts.fields) == 1 {
		return res.ReadVal(v)
	}
	vm, err := res.ReadValueMap()
	if err != nil {
		return err
	}
	return vm.Decode(v)
}