entc/gen: move predicates to mutation object (#825)

examples/start/ent/user_update.go

@@ -22,14 +22,13 @@ import (
 // UserUpdate is the builder for updating User entities.
 type UserUpdate struct {
 	config
-	hooks      []Hook
-	mutation   *UserMutation
-	predicates []predicate.User
+	hooks    []Hook
+	mutation *UserMutation
 }
 
 // Where adds a new predicate for the builder.
 func (uu *UserUpdate) Where(ps ...predicate.User) *UserUpdate {
-	uu.predicates = append(uu.predicates, ps...)
+	uu.mutation.predicates = append(uu.mutation.predicates, ps...)
 	return uu
 }
 
@@ -215,7 +214,7 @@ func (uu *UserUpdate) sqlSave(ctx context.Context) (n int, err error) {
 			},
 		},
 	}
-	if ps := uu.predicates; len(ps) > 0 {
+	if ps := uu.mutation.predicates; len(ps) > 0 {
 		_spec.Predicate = func(selector *sql.Selector) {
 			for i := range ps {
 				ps[i](selector)