Merge pull request #1 from gobenon/gobenon-m2mpatch-1

Update orm_querym2m.go

orm/orm_querym2m.go

@@ -44,7 +44,15 @@ func (o *queryM2M) Add(mds ...interface{}) (int64, error) {
 	dbase := orm.alias.DbBaser
 
 	var models []interface{}
-
+	last_md_col_name := mi.fields.dbcols[len(mi.fields.dbcols)-1]
+	last_md := mds[len(mds)-1]
+	var v3 interface{}
+	var names []string
+	var values []interface{}
+	if reflect.Indirect(reflect.ValueOf(last_md)).Kind() != reflect.Struct {
+		v3 = (last_md)
+		mds = mds[:len(mds)-1]
+	}
 	for _, md := range mds {
 		val := reflect.ValueOf(md)
 		if val.Kind() == reflect.Slice || val.Kind() == reflect.Array {
@@ -63,15 +71,18 @@ func (o *queryM2M) Add(mds ...interface{}) (int64, error) {
 	if exist == false {
 		panic(ErrMissPK)
 	}
+	if v3 != nil {
+		names = []string{mfi.column, rfi.column, last_md_col_name}
 
-	names := []string{mfi.column, rfi.column}
-
-	values := make([]interface{}, 0, len(models)*2)
+		values = make([]interface{}, 0, len(models)*3)
+	} else {
+		names = []string{mfi.column, rfi.column}
 
+		values = make([]interface{}, 0, len(models)*2)
+	}
 	for _, md := range models {
 
 		ind := reflect.Indirect(reflect.ValueOf(md))
-
 		var v2 interface{}
 		if ind.Kind() != reflect.Struct {
 			v2 = ind.Interface()
@@ -81,14 +92,17 @@ func (o *queryM2M) Add(mds ...interface{}) (int64, error) {
 				panic(ErrMissPK)
 			}
 		}
-
+		if v3 == nil {
 			values = append(values, v1, v2)
-
+		} else {
+			values = append(values, v1, v2, v3)
 		}
 
+	}
 	return dbase.InsertValue(orm.db, mi, true, names, values)
 }
 
+
 // remove models following the origin model relationship
 func (o *queryM2M) Remove(mds ...interface{}) (int64, error) {
 	fi := o.fi