Make Updates accept struct other than map[string]interface{}

README.md

@@ -219,6 +219,12 @@ db.Table("users").Where(10).Updates(map[string]interface{}{"name": "hello", "age
 //// update users set name='hello', age=18 where id = 10;
 db.Table("users").Updates(map[string]interface{}{"name": "hello", "age": 18})
 //// update users set name='hello', age=18;
+db.Find(&users).Updates(User{Name: "hello", Age: 18})
+//// update users set name='hello', age=18;
+db.First(&user, 20).Updates(User{Name: "hello", Age: 18})
+//// update users set name='hello', age=18 where id = 20;
+//// object user's value would be reflected by the Updates also,
+//// so you don't need to refetch the user from database
 
 // Soft Delete
 // For those struct have DeletedAt field, they will get soft delete ability automatically!

chain.go

@@ -157,7 +157,7 @@ func (s *Chain) Update(column string, value interface{}) *Chain {
 	return s.Updates(map[string]interface{}{column: value}, true)
 }
 
-func (s *Chain) Updates(values map[string]interface{}, ignore_protected_attrs ...bool) *Chain {
+func (s *Chain) Updates(values interface{}, ignore_protected_attrs ...bool) *Chain {
 	s.do(s.value).setUpdateAttrs(values, ignore_protected_attrs...).update()
 	return s
 }

do.go

@@ -146,8 +146,20 @@ func (s *Do) create() {
 	return
 }
 
-func (s *Do) setUpdateAttrs(values map[string]interface{}, ignore_protected_attrs ...bool) *Do {
-	s.updateAttrs = values
+func (s *Do) setUpdateAttrs(values interface{}, ignore_protected_attrs ...bool) *Do {
+	switch values.(type) {
+	case map[string]interface{}:
+		s.updateAttrs = values.(map[string]interface{})
+	case interface{}:
+		m := &Model{data: values, driver: s.driver}
+		fields := m.columnsHasValue("")
+
+		s.updateAttrs = make(map[string]interface{}, len(fields))
+		for _, field := range fields {
+			s.updateAttrs[field.DbName] = field.Value
+		}
+	}
+
 	s.ignoreProtectedAttrs = len(ignore_protected_attrs) > 0 && ignore_protected_attrs[0]
 	return s
 }

gorm_test.go

@@ -778,7 +778,10 @@ func TestUpdates(t *testing.T) {
 	updated_at2 := product2.UpdatedAt
 
 	var product3 Product
-	db.First(&product3, product2.Id).Updates(map[string]interface{}{"code": "edf", "price": 100})
+	db.First(&product3, product2.Id).Updates(Product{Code: "edf", Price: 100})
+	if product3.Code != "edf" || product3.Price != 100 {
+		t.Errorf("Object should be updated also with update attributes")
+	}
 
 	if updated_at2.Format(time.RFC3339Nano) != product3.UpdatedAt.Format(time.RFC3339Nano) {
 		t.Errorf("updated_at should not be updated if nothing really new")