entc/gen: allow setting unique fields with default values of type function (#610)

Fixed #609

entc/gen/type.go

@@ -575,7 +575,7 @@ func (t *Type) checkField(tf *Field, f *load.Field) (err error) {
 		err = fmt.Errorf("invalid type for field %s", f.Name)
 	case f.Nillable && !f.Optional:
 		err = fmt.Errorf("nillable field %q must be optional", f.Name)
-	case f.Unique && f.Default:
+	case f.Unique && f.Default && f.Info.Type != field.TypeUUID:
 		err = fmt.Errorf("unique field %q cannot have default value", f.Name)
 	case t.fields[f.Name] != nil:
 		err = fmt.Errorf("field %q redeclared for type %q", f.Name, t.Name)

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

@@ -15,7 +15,7 @@ var (
 	// BlobsColumns holds the columns for the "blobs" table.
 	BlobsColumns = []*schema.Column{
 		{Name: "id", Type: field.TypeUUID},
-		{Name: "uuid", Type: field.TypeUUID},
+		{Name: "uuid", Type: field.TypeUUID, Unique: true},
 		{Name: "blob_parent", Type: field.TypeUUID, Unique: true, Nullable: true},
 	}
 	// BlobsTable holds the schema information for the "blobs" table.

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

@@ -23,7 +23,8 @@ func (Blob) Fields() []ent.Field {
 		field.UUID("id", uuid.UUID{}).
 			Default(uuid.New),
 		field.UUID("uuid", uuid.UUID{}).
-			Default(uuid.New),
+			Default(uuid.New).
+			Unique(),
 	}
 }