entc/gen: add default-funcs and validators for userdefined id (#436)

Fixes #432

entc/gen/template/builder/create.tmpl

@@ -34,8 +34,9 @@ type {{ $builder }} struct {
 // Save creates the {{ $.Name }} in the database.
 func ({{ $receiver }} *{{ $builder }}) Save(ctx context.Context) (*{{ $.Name }}, error) {
 	{{- $mutation := print $receiver ".mutation" }}
-	{{- range $_, $f := $.Fields }}
-		{{- if or $f.Default (not $f.Optional) }}
+	{{- $fields := $.Fields }}{{ if $.ID.UserDefined }}{{ $fields = append $fields $.ID }}{{ end }}
+	{{- range $f := $fields }}
+		{{- if or $f.Default (and (not $f.Optional) (ne $f $.ID)) }}
 			if _, ok := {{ $mutation }}.{{ $f.MutationGet }}(); !ok {
 				{{- if $f.Default }}
 					v := {{ $.Package }}.{{ $f.DefaultName }}{{ if or $f.IsTime $f.IsUUID }}(){{ end }}
@@ -53,7 +54,7 @@ func ({{ $receiver }} *{{ $builder }}) Save(ctx context.Context) (*{{ $.Name }},
 			}
 		{{- end }}
 	{{- end }}
-	{{- range $_, $e := $.Edges }}
+	{{- range $e := $.Edges }}
 		{{- if not $e.Optional }}
 			{{- if $e.Unique }}
 				if _, ok := {{ $mutation }}.{{ $e.StructField }}ID(); !ok {

entc/gen/template/meta.tmpl

@@ -57,7 +57,8 @@ const (
 		{{- if $.HasPolicy }}
 			Policy ent.Policy
 		{{- end }}
-		{{- range $f := $.Fields }}
+		{{- $fields := $.Fields }}{{ if $.ID.UserDefined }}{{ $fields = append $fields $.ID }}{{ end }}
+		{{- range $f := $fields }}
 			{{- if and $f.Default (not $f.IsEnum) }}
 				{{- $default := $f.DefaultName }}
 				// {{ $default }} holds the default value on creation for the {{ $f.Name }} field.
@@ -79,7 +80,7 @@ const (
 {{ end }}
 
 {{/* define custom type for enum fields */}}
-{{ range $_, $f := $.Fields -}}
+{{ range $f := $.Fields -}}
 	{{ if $f.IsEnum }}
 		{{/* omit the package name from the type. */}}
 		{{ $enum := trimPackage $f.Type.String $.Package }}

entc/gen/template/runtime.tmpl

@@ -110,11 +110,12 @@ func init() {
 				{{- end }}
 			}
 		{{- end }}
-		{{- with $n.Fields }}
+		{{- $fields := $n.Fields }}{{ if $n.ID.UserDefined }}{{ $fields = append $fields $n.ID }}{{ end }}
+		{{- with $fields }}
 			{{ $pkg }}Fields := {{ $schema }}.{{ $n.Name }}{}.Fields()
 			_ = {{ $pkg }}Fields
 		{{- end }}
-		{{- range $i, $f := $n.Fields }}
+		{{- range $i, $f := $fields }}
 			{{- $desc := print $pkg "Desc" $f.StructField }}
 			{{- /* enum default values handled near their declarations (in type package). */}}
 			{{- if or (and $f.Default (not $f.IsEnum)) $f.UpdateDefault $f.Validators }}

entc/gen/type.go

@@ -222,7 +222,11 @@ func (t Type) HasAssoc(name string) (*Edge, bool) {
 
 // HasValidators reports if any of the type's field has validators.
 func (t Type) HasValidators() bool {
-	for _, f := range t.Fields {
+	fields := t.Fields
+	if t.ID.UserDefined {
+		fields = append(fields, t.ID)
+	}
+	for _, f := range fields {
 		if f.Validators > 0 {
 			return true
 		}
@@ -232,7 +236,11 @@ func (t Type) HasValidators() bool {
 
 // HasDefault reports if any of this type's fields has default value on creation.
 func (t Type) HasDefault() bool {
-	for _, f := range t.Fields {
+	fields := t.Fields
+	if t.ID.UserDefined {
+		fields = append(fields, t.ID)
+	}
+	for _, f := range fields {
 		if f.Default {
 			return true
 		}

entc/integration/customid/customid_test.go

@@ -91,10 +91,11 @@ func CustomID(t *testing.T, client *ent.Client) {
 	require.Equal(t, 3, hub.ID)
 	require.Equal(t, []int{1, 5}, hub.QueryUsers().Order(ent.Asc(user.FieldID)).IDsX(ctx))
 
-	blb := client.Blob.Create().SetID(uuid.New()).SaveX(ctx)
-	require.NotEmpty(t, blb.ID)
-	require.NotEmpty(t, blb.UUID)
-	chd := client.Blob.Create().SetID(uuid.New()).SetParent(blb).SaveX(ctx)
+	blb := client.Blob.Create().SaveX(ctx)
+	require.NotEmpty(t, blb.ID, "use default value")
+	id := uuid.New()
+	chd := client.Blob.Create().SetID(id).SetParent(blb).SaveX(ctx)
+	require.Equal(t, id, chd.ID, "use provided id")
 	require.Equal(t, blb.ID, chd.QueryParent().OnlyX(ctx).ID)
 	lnk := client.Blob.Create().SetID(uuid.New()).AddLinks(chd, blb).SaveX(ctx)
 	require.Equal(t, 2, lnk.QueryLinks().CountX(ctx))

entc/integration/customid/ent/blob/blob.go

@@ -52,4 +52,6 @@ var (
 var (
 	// DefaultUUID holds the default value on creation for the uuid field.
 	DefaultUUID func() uuid.UUID
+	// DefaultID holds the default value on creation for the id field.
+	DefaultID func() uuid.UUID
 )

entc/integration/customid/ent/blob_create.go

@@ -75,6 +75,10 @@ func (bc *BlobCreate) Save(ctx context.Context) (*Blob, error) {
 		v := blob.DefaultUUID()
 		bc.mutation.SetUUID(v)
 	}
+	if _, ok := bc.mutation.ID(); !ok {
+		v := blob.DefaultID()
+		bc.mutation.SetID(v)
+	}
 	var (
 		err  error
 		node *Blob

entc/integration/customid/ent/pet/pet.go

@@ -61,3 +61,8 @@ var (
 	// primary key for the friends relation (M2M).
 	FriendsPrimaryKey = []string{"pet_id", "friend_id"}
 )
+
+var (
+	// IDValidator is a validator for the "id" field. It is called by the builders before save.
+	IDValidator func(string) error
+)

entc/integration/customid/ent/pet_create.go

@@ -100,6 +100,11 @@ func (pc *PetCreate) SetBestFriend(p *Pet) *PetCreate {
 
 // Save creates the Pet in the database.
 func (pc *PetCreate) Save(ctx context.Context) (*Pet, error) {
+	if v, ok := pc.mutation.ID(); ok {
+		if err := pet.IDValidator(v); err != nil {
+			return nil, fmt.Errorf("ent: validator failed for field \"id\": %v", err)
+		}
+	}
 	var (
 		err  error
 		node *Pet

entc/integration/customid/ent/runtime.go

@@ -8,6 +8,7 @@ package ent
 
 import (
 	"github.com/facebookincubator/ent/entc/integration/customid/ent/blob"
+	"github.com/facebookincubator/ent/entc/integration/customid/ent/pet"
 	"github.com/facebookincubator/ent/entc/integration/customid/ent/schema"
 	"github.com/google/uuid"
 )
@@ -22,4 +23,28 @@ func init() {
 	blobDescUUID := blobFields[1].Descriptor()
 	// blob.DefaultUUID holds the default value on creation for the uuid field.
 	blob.DefaultUUID = blobDescUUID.Default.(func() uuid.UUID)
+	// blobDescID is the schema descriptor for id field.
+	blobDescID := blobFields[0].Descriptor()
+	// blob.DefaultID holds the default value on creation for the id field.
+	blob.DefaultID = blobDescID.Default.(func() uuid.UUID)
+	petFields := schema.Pet{}.Fields()
+	_ = petFields
+	// petDescID is the schema descriptor for id field.
+	petDescID := petFields[0].Descriptor()
+	// pet.IDValidator is a validator for the "id" field. It is called by the builders before save.
+	pet.IDValidator = func() func(string) error {
+		validators := petDescID.Validators
+		fns := [...]func(string) error{
+			validators[0].(func(string) error),
+			validators[1].(func(string) error),
+		}
+		return func(id string) error {
+			for _, fn := range fns {
+				if err := fn(id); err != nil {
+					return err
+				}
+			}
+			return nil
+		}
+	}()
 }

entc/integration/customid/ent/schema/blob.go

@@ -20,7 +20,8 @@ type Blob struct {
 // Fields of the Blob.
 func (Blob) Fields() []ent.Field {
 	return []ent.Field{
-		field.UUID("id", uuid.UUID{}),
+		field.UUID("id", uuid.UUID{}).
+			Default(uuid.New),
 		field.UUID("uuid", uuid.UUID{}).
 			Default(uuid.New),
 	}