Write stub code for Many2Many

main.go

@@ -338,7 +338,11 @@ func (s *DB) AddUniqueIndex(indexName string, column ...string) *DB {
 	return s
 }
 
-func (s *DB) RemoveIndex(column string) *DB {
+func (s *DB) RemoveIndex(indexName string) *DB {
-	s.clone().NewScope(s.Value).removeIndex(column)
+	s.clone().NewScope(s.Value).removeIndex(indexName)
+	return s
+}
+
+func (s *DB) Many2Many(column string) *DB {
 	return s
 }

many2many.go

@@ -0,0 +1,23 @@
+package gorm
+
+type many2many struct {
+}
+
+func (*many2many) Find(value interface{}) {
+}
+
+func (*many2many) Append(values interface{}) {
+}
+
+func (*many2many) Delete(value interface{}) {
+}
+
+func (*many2many) Clear(value interface{}) {
+}
+
+func (*many2many) Replace(values interface{}) {
+}
+
+func (*many2many) Count(values interface{}) int {
+	return 0
+}

migration_test.go

@@ -51,6 +51,10 @@ func runMigration() {
 	if err := db.AutoMigrate(Role{}).Error; err != nil {
 		panic(fmt.Sprintf("No error should happen when create table, but got %+v", err))
 	}
+
+	if err := db.AutoMigrate(Language{}).Error; err != nil {
+		panic(fmt.Sprintf("No error should happen when create table, but got %+v", err))
+	}
 }
 
 func TestIndexes(t *testing.T) {

relations_test.go

@@ -127,10 +127,25 @@ func TestRelated(t *testing.T) {
 }
 
 func TestQueryManyToManyWithRelated(t *testing.T) {
-	// db.Model(&User{}).Related(&[]Language{}, "Languages")
+	var languages = []Language{{Name: "ZH"}, {Name: "EN"}, {Name: "DE"}}
-	// SELECT `languages`.* FROM `languages` INNER JOIN `user_languages` ON `languages`.`id` = `user_languages`.`language_id` WHERE `user_languages`.`user_id` = 111
+	user := User{Name: "Many2Many", Languages: languages}
-	// db.Model(&User{}).Many2Many("Languages").Find(&[]Language{})
+	db.Debug().Save(&user)
+
+	var newLanguages []Language
+	db.Model(&user).Related(&newLanguages, "Languages")
+	if len(newLanguages) != 3 {
+		t.Errorf("Query many to many relations")
+	}
+
+	newLanguages = []Language{}
+	db.Model(&user).Many2Many("Languages").Find(&newLanguages)
+	if len(newLanguages) != 3 {
+		t.Errorf("Query many to many relations")
+	}
+
 	// db.Model(&User{}).Many2Many("Languages").Add(&Language{})
 	// db.Model(&User{}).Many2Many("Languages").Remove(&Language{})
 	// db.Model(&User{}).Many2Many("Languages").Replace(&[]Language{})
+	// db.Model(&User{}).Related(&[]Language{}, "Languages")
+	// SELECT `languages`.* FROM `languages` INNER JOIN `user_languages` ON `languages`.`id` = `user_languages`.`language_id` WHERE `user_languages`.`user_id` = 111
 }

scope_private.go

@@ -300,7 +300,7 @@ func (scope *Scope) updatedAttrsWithValues(values map[string]interface{}, ignore
 }
 
 func (scope *Scope) sqlTagForField(field *Field) (tag string) {
-	tag, addationalTag, size := parseSqlTag(field.Tag.Get(scope.db.parent.tagIdentifier))
+	tag, additionalTag, size := parseSqlTag(field.Tag.Get(scope.db.parent.tagIdentifier))
 
 	if tag == "-" {
 		field.IsIgnored = true
@@ -330,8 +330,8 @@ func (scope *Scope) sqlTagForField(field *Field) (tag string) {
 		}
 	}
 
-	if len(addationalTag) > 0 {
+	if len(additionalTag) > 0 {
-		tag = tag + " " + addationalTag
+		tag = tag + " " + additionalTag
 	}
 	return
 }

structs_test.go

@@ -24,6 +24,7 @@ type User struct {
 	ShippingAddressId int64         // Embedded struct's foreign key
 	CreditCard        CreditCard
 	Latitude          float64
+	Languages         []Language `gorm:"many2many:user_languages;"`
 	CompanyId         int64
 	Company
 	Role
@@ -60,6 +61,11 @@ type Address struct {
 	DeletedAt time.Time
 }
 
+type Language struct {
+	Id   int
+	Name string
+}
+
 type Product struct {
 	Id                    int64
 	Code                  string