fix:serializer contain field panic (#5461)

schema/field.go

@@ -950,7 +950,7 @@ func (field *Field) setupNewValuePool() {
 			New: func() interface{} {
 				return &serializer{
 					Field:      field,
-					Serializer: reflect.New(reflect.Indirect(reflect.ValueOf(field.Serializer)).Type()).Interface().(SerializerInterface),
+					Serializer: field.Serializer,
 				}
 			},
 		}

tests/serializer_test.go

@@ -22,6 +22,7 @@ type SerializerStruct struct {
 	JobInfo                Job                    `gorm:"type:bytes;serializer:gob"`
 	CreatedTime            int64                  `gorm:"serializer:unixtime;type:time"` // store time in db, use int as field type
 	UpdatedTime            *int64                 `gorm:"serializer:unixtime;type:time"` // store time in db, use int as field type
+	CustomSerializerString string                 `gorm:"serializer:custom"`
 	EncryptedString        EncryptedString
 }
 
@@ -52,7 +53,32 @@ func (es EncryptedString) Value(ctx context.Context, field *schema.Field, dst re
 	return "hello" + string(es), nil
 }
 
+type CustomSerializer struct {
+	prefix []byte
+}
+
+func NewCustomSerializer(prefix string) *CustomSerializer {
+	return &CustomSerializer{prefix: []byte(prefix)}
+}
+
+func (c *CustomSerializer) Scan(ctx context.Context, field *schema.Field, dst reflect.Value, dbValue interface{}) (err error) {
+	switch value := dbValue.(type) {
+	case []byte:
+		err = field.Set(ctx, dst, bytes.TrimPrefix(value, c.prefix))
+	case string:
+		err = field.Set(ctx, dst, strings.TrimPrefix(value, string(c.prefix)))
+	default:
+		err = fmt.Errorf("unsupported data %#v", dbValue)
+	}
+	return err
+}
+
+func (c *CustomSerializer) Value(ctx context.Context, field *schema.Field, dst reflect.Value, fieldValue interface{}) (interface{}, error) {
+	return fmt.Sprintf("%s%s", c.prefix, fieldValue), nil
+}
+
 func TestSerializer(t *testing.T) {
+	schema.RegisterSerializer("custom", NewCustomSerializer("hello"))
 	DB.Migrator().DropTable(&SerializerStruct{})
 	if err := DB.Migrator().AutoMigrate(&SerializerStruct{}); err != nil {
 		t.Fatalf("no error should happen when migrate scanner, valuer struct, got error %v", err)
@@ -74,6 +100,7 @@ func TestSerializer(t *testing.T) {
 			Location: "Kenmawr",
 			IsIntern: false,
 		},
+		CustomSerializerString: "world",
 	}
 
 	if err := DB.Create(&data).Error; err != nil {
@@ -90,6 +117,7 @@ func TestSerializer(t *testing.T) {
 }
 
 func TestSerializerAssignFirstOrCreate(t *testing.T) {
+	schema.RegisterSerializer("custom", NewCustomSerializer("hello"))
 	DB.Migrator().DropTable(&SerializerStruct{})
 	if err := DB.Migrator().AutoMigrate(&SerializerStruct{}); err != nil {
 		t.Fatalf("no error should happen when migrate scanner, valuer struct, got error %v", err)
@@ -109,6 +137,7 @@ func TestSerializerAssignFirstOrCreate(t *testing.T) {
 			Location: "Shadyside",
 			IsIntern: false,
 		},
+		CustomSerializerString: "world",
 	}
 
 	// first time insert record