entc/gen: add support for referencing fks to existing fields (#1289)

examples/o2o2types/ent/card_query.go

@@ -381,7 +381,8 @@ func (cq *CardQuery) sqlAll(ctx context.Context) ([]*Card, error) {
 		ids := make([]int, 0, len(nodes))
 		nodeids := make(map[int][]*Card)
 		for i := range nodes {
-			if fk := nodes[i].user_card; fk != nil {
+			fk := nodes[i].user_card
+			if fk != nil {
 				ids = append(ids, *fk)
 				nodeids[*fk] = append(nodeids[*fk], nodes[i])
 			}

examples/o2o2types/ent/migrate/schema.go

@@ -26,9 +26,8 @@ var (
 		PrimaryKey: []*schema.Column{CardsColumns[0]},
 		ForeignKeys: []*schema.ForeignKey{
 			{
-				Symbol:  "cards_users_card",
-				Columns: []*schema.Column{CardsColumns[3]},
-
+				Symbol:     "cards_users_card",
+				Columns:    []*schema.Column{CardsColumns[3]},
 				RefColumns: []*schema.Column{UsersColumns[0]},
 				OnDelete:   schema.SetNull,
 			},