fix bug on cache delete

session_delete.go

@@ -29,6 +29,7 @@ func (session *Session) cacheDelete(sqlStr string, args ...interface{}) error {
 
 	cacher := session.engine.getCacher2(session.statement.RefTable)
 	tableName := session.statement.TableName()
+	pkColumns := session.statement.RefTable.PKColumns()
 	ids, err := core.GetCacheSql(cacher, tableName, newsql, args)
 	if err != nil {
 		resultsSlice, err := session.queryBytes(newsql, args...)
@@ -40,7 +41,7 @@ func (session *Session) cacheDelete(sqlStr string, args ...interface{}) error {
 			for _, data := range resultsSlice {
 				var id int64
 				var pk core.PK = make([]interface{}, 0)
-				for _, col := range session.statement.RefTable.PKColumns() {
+				for _, col := range pkColumns {
 					if v, ok := data[col.Name]; !ok {
 						return errors.New("no id")
 					} else if col.SQLType.IsText() {

session_delete_test.go

@@ -137,3 +137,32 @@ func TestDeleted(t *testing.T) {
 	assert.NoError(t, err)
 	assert.EqualValues(t, 2, len(records3))
 }
+
+func TestCacheDelete(t *testing.T) {
+	assert.NoError(t, prepareEngine())
+
+	cacher := NewLRUCacher(NewMemoryStore(), 1000)
+	testEngine.SetDefaultCacher(cacher)
+
+	type CacheDeleteStruct struct {
+		Id int64
+	}
+
+	err := testEngine.CreateTables(&CacheDeleteStruct{})
+	assert.NoError(t, err)
+
+	_, err = testEngine.Insert(&CacheDeleteStruct{})
+	assert.NoError(t, err)
+
+	aff, err := testEngine.Delete(&CacheDeleteStruct{
+		Id: 1,
+	})
+	assert.NoError(t, err)
+	assert.EqualValues(t, aff, 1)
+
+	aff, err = testEngine.Unscoped().Delete(&CacheDeleteStruct{
+		Id: 1,
+	})
+	assert.NoError(t, err)
+	assert.EqualValues(t, aff, 0)
+}