entc/load: add reflect kind for default value (#1101)

entc/load/schema.go

@@ -47,6 +47,7 @@ type Field struct {
 	Optional      bool                    `json:"optional,omitempty"`
 	Default       bool                    `json:"default,omitempty"`
 	DefaultValue  interface{}             `json:"default_value,omitempty"`
+	DefaultKind   reflect.Kind            `json:"default_kind,omitempty"`
 	UpdateDefault bool                    `json:"update_default,omitempty"`
 	Immutable     bool                    `json:"immutable,omitempty"`
 	Validators    int                     `json:"validators,omitempty"`
@@ -133,6 +134,9 @@ func NewField(fd *field.Descriptor) (*Field, error) {
 	if size := int64(fd.Size); size != 0 {
 		sf.Size = &size
 	}
+	if sf.Default {
+		sf.DefaultKind = reflect.TypeOf(fd.Default).Kind()
+	}
 	// If the default value can be encoded to the generator.
 	// For example, not a function like time.Now.
 	if _, err := json.Marshal(fd.Default); err == nil {

entc/load/schema_test.go

@@ -8,6 +8,7 @@ import (
 	"context"
 	"encoding/json"
 	"math"
+	"reflect"
 	"testing"
 	"time"
 
@@ -170,10 +171,12 @@ func TestMarshalSchema(t *testing.T) {
 		require.Equal(t, "sensitive", schema.Fields[5].Name)
 		require.Equal(t, field.TypeString, schema.Fields[5].Info.Type)
 		require.True(t, schema.Fields[5].Sensitive)
+		require.Equal(t, reflect.Invalid, schema.Fields[5].DefaultKind)
 
 		require.Equal(t, "creation_time", schema.Fields[6].Name)
 		require.Equal(t, field.TypeTime, schema.Fields[6].Info.Type)
 		require.Nil(t, schema.Fields[6].DefaultValue)
+		require.Equal(t, reflect.Func, schema.Fields[6].DefaultKind)
 
 		require.Equal(t, "uuid", schema.Fields[7].Name)
 		require.Equal(t, field.TypeUUID, schema.Fields[7].Info.Type)