Add Method UpdateColumn, UpdateColumns

README.md

@@ -320,7 +320,7 @@ db.Where("role = ?", "admin").Or("role = ?", "super_admin").Not("name = ?", "jin
 user.Name = "jinzhu 2"
 user.Age = 100
 db.Save(&user)
-//// UPDATE users SET name='jinzhu 2', age=100 WHERE id=111;
+//// UPDATE users SET name='jinzhu 2', age=100, updated_at = '2013-11-17 21:34:10' WHERE id=111;
 ```
 
 ### Update one attribute with `Update`
@@ -328,12 +328,12 @@ db.Save(&user)
 ```go
 // Update existing user's name if it is changed
 db.Model(&user).Update("name", "hello")
-//// UPDATE users SET name='hello' WHERE id=111;
+//// UPDATE users SET name='hello', updated_at = '2013-11-17 21:34:10' WHERE id=111;
 
 // Find out a user, and update the name if it is changed
 db.First(&user, 111).Update("name", "hello")
 //// SELECT * FROM users LIMIT 1;
-//// UPDATE users SET name='hello' WHERE id=111;
+//// UPDATE users SET name='hello', updated_at = '2013-11-17 21:34:10' WHERE id=111;
 
 // Update name with search condiation and specified table name
 db.Table("users").Where(10).Update("name", "hello")
@@ -345,7 +345,7 @@ db.Table("users").Where(10).Update("name", "hello")
 ```go
 // Update user's name and age if they are changed
 db.Model(&user).Updates(User{Name: "hello", Age: 18})
-//// UPDATE users SET name='hello', age=18 WHERE id = 111;
+//// UPDATE users SET name='hello', age=18, updated_at = '2013-11-17 21:34:10' WHERE id = 111;
 
 // Updates with Map
 db.Table("users").Where(10).Updates(map[string]interface{}{"name": "hello", "age": 18})
@@ -356,6 +356,16 @@ db.Model(User{}).Updates(User{Name: "hello", Age: 18})
 //// UPDATE users SET name='hello', age=18;
 ```
 
+### Update attributes without callbacks
+
+```go
+db.Model(&user).UpdateColumn("name", "hello")
+//// UPDATE users SET name='hello' WHERE id = 111;
+
+db.Model(&user).UpdateColumns(User{Name: "hello", Age: 18})
+//// UPDATE users SET name='hello', age=18 WHERE id = 111;
+```
+
 ## Delete
 
 ### Delete an existing struct
@@ -780,7 +790,6 @@ db.Where("email = ?", "x@example.org").Attrs(User{RegisteredIp: "111.111.111.111
 ```
 
 ## TODO
-* UpdateColumn/Columns
 * Scopes
 * Joins
 * Scan

do.go

@@ -199,43 +199,52 @@ func (s *Do) create() (i interface{}) {
 	return
 }
 
+func (s *Do) convertToMapInterface(values interface{}) map[string]interface{} {
+	attrs := map[string]interface{}{}
+
+	switch value := values.(type) {
+	case map[string]interface{}:
+		attrs = value
+	case []interface{}:
+		for _, v := range value {
+			for key, value := range s.convertToMapInterface(v) {
+				attrs[key] = value
+			}
+		}
+	case interface{}:
+		m := &Model{data: values, do: s}
+		for _, field := range m.columnsHasValue("other") {
+			attrs[field.dbName] = field.Value
+		}
+	}
+	return attrs
+}
+
 func (s *Do) updateAttrs(values interface{}, ignore_protected_attrs ...bool) *Do {
 	ignore_protected := len(ignore_protected_attrs) > 0 && ignore_protected_attrs[0]
 	s.usingUpdate = true
 
-	switch value := values.(type) {
-	case map[string]interface{}:
-		if len(value) > 0 {
-			results, has_update := s.model.updatedColumnsAndValues(value, ignore_protected)
+	if maps := s.convertToMapInterface(values); len(maps) > 0 {
+		results, has_update := s.model.updatedColumnsAndValues(maps, ignore_protected)
 		if len(results) > 0 {
 			s.update_attrs = results
 		}
 		s.hasUpdate = has_update
 	}
-	case []interface{}:
-		for _, v := range value {
-			s.updateAttrs(v)
-		}
-	case interface{}:
-		m := &Model{data: values, do: s}
-		attrs := map[string]interface{}{}
-		for _, field := range m.columnsHasValue("other") {
-			attrs[field.dbName] = field.Value
-		}
-		s.updateAttrs(attrs)
-	}
 	return s
 }
 
-func (s *Do) prepareUpdateSql() {
+func (s *Do) prepareUpdateSql(include_self bool) {
 	var sqls []string
 	for key, value := range s.update_attrs {
 		sqls = append(sqls, fmt.Sprintf("%v = %v", key, s.addToVars(value)))
 	}
 
+	if include_self {
 		for key, value := range s.model.columnsAndValues("update") {
 			sqls = append(sqls, fmt.Sprintf("%v = %v", key, s.addToVars(value)))
 		}
+	}
 
 	s.sql = fmt.Sprintf(
 		"UPDATE %v SET %v %v",
@@ -246,6 +255,16 @@ func (s *Do) prepareUpdateSql() {
 	return
 }
 
+func (s *Do) updateColumns(value interface{}) *Do {
+	s.update_attrs = s.convertToMapInterface(value)
+	s.prepareUpdateSql(false)
+	if !s.db.hasError() {
+		s.exec()
+		s.updateAttrs(s.update_attrs)
+	}
+	return s
+}
+
 func (s *Do) update() *Do {
 	if s.usingUpdate && !s.hasUpdate {
 		return s
@@ -255,7 +274,7 @@ func (s *Do) update() *Do {
 	s.model.callMethod("BeforeSave")
 	s.saveBeforeAssociations()
 
-	s.prepareUpdateSql()
+	s.prepareUpdateSql(true)
 
 	if !s.db.hasError() {
 		s.exec()

gorm_test.go

@@ -900,6 +900,31 @@ func TestUpdates(t *testing.T) {
 	}
 }
 
+func TestUpdateColumn(t *testing.T) {
+	product1 := Product{Code: "update_column 1", Price: 10}
+	product2 := Product{Code: "update_column 2", Price: 20}
+	db.Save(&product1).Save(&product2).UpdateColumn(map[string]interface{}{"code": "update_column 3", "price": 100})
+	if product2.Code != "update_column 3" || product2.Price != 100 {
+		t.Errorf("product 2 should be updated with update column")
+	}
+
+	var product3 Product
+	db.First(&product3, product1.Id)
+	if product3.Code != "update_column 1" || product3.Price != 10 {
+		t.Errorf("product 1 should not be updated")
+	}
+
+	var product4, product5 Product
+	db.First(&product4, product2.Id)
+	updated_at1 := product4.UpdatedAt
+
+	db.Model(Product{}).Where(product2.Id).UpdateColumn("code", "update_column_new")
+	db.First(&product5, product2.Id)
+	if updated_at1.Format(time.RFC3339Nano) != product5.UpdatedAt.Format(time.RFC3339Nano) {
+		t.Errorf("updated_at should not be updated with update column")
+	}
+}
+
 func TestSoftDelete(t *testing.T) {
 	type Order struct {
 		Id        int64
@@ -1444,7 +1469,7 @@ func BenchmarkGorm(b *testing.B) {
 		// Query
 		db.First(&BigEmail{}, "email = ?", e)
 		// Update
-		db.Model(&email).Update("email", "new-"+e)
+		db.Model(&email).UpdateColumn("email", "new-"+e)
 		// Delete
 		db.Delete(&email)
 	}

main.go

@@ -153,6 +153,14 @@ func (s *DB) Updates(values interface{}, ignore_protected_attrs ...bool) *DB {
 	return s.clone().do(s.data).begin().updateAttrs(values, ignore_protected_attrs...).update().commit_or_rollback().db
 }
 
+func (s *DB) UpdateColumn(attrs ...interface{}) *DB {
+	return s.UpdateColumns(toSearchableMap(attrs...), true)
+}
+
+func (s *DB) UpdateColumns(values interface{}, ignore_protected_attrs ...bool) *DB {
+	return s.clone().do(s.data).begin().updateColumns(values).commit_or_rollback().db
+}
+
 func (s *DB) Save(value interface{}) *DB {
 	return s.clone().do(value).begin().save().commit_or_rollback().db
 }

model.go

@@ -134,6 +134,10 @@ func (m *Model) updatedColumnsAndValues(values map[string]interface{}, ignore_pr
 	}
 
 	data := m.reflectData()
+	if !data.CanAddr() {
+		return
+	}
+
 	for key, value := range values {
 		if field := data.FieldByName(snakeToUpperCamel(key)); field.IsValid() {
 			if field.Interface() != value {