ent/gen: adding EqualFold predicate for string fields

Summary: Similar to `ContainsFold` predicate requires `--storage=sql` argument to be passed to entc.

Reviewed By: a8m

Differential Revision: D17074805

fbshipit-source-id: ced299154417fe2c9007cd6a7a504f53c8b2ef98

dialect/sql/builder.go

@@ -1024,6 +1024,14 @@ func (p *Predicate) HasSuffix(col, suffix string) *Predicate {
 	return p.Like(col, "%"+suffix)
 }
 
+// EqualFold is a helper predicate that applies the "=" predicate with case-folding.
+func EqualFold(col, sub string) *Predicate { return (&Predicate{}).EqualFold(col, sub) }
+
+// EqualFold is a helper predicate that applies the "=" predicate with case-folding.
+func (p *Predicate) EqualFold(col, sub string) *Predicate {
+	return p.EQ(Lower(col), strings.ToLower(sub))
+}
+
 // Contains is a helper predicate that checks substring using the LIKE predicate.
 func Contains(col, sub string) *Predicate { return (&Predicate{}).Contains(col, sub) }
 

dialect/sql/builder_test.go

@@ -188,6 +188,20 @@ func TestBuilder(t *testing.T) {
 			wantQuery: "UPDATE `users` SET `name` = ? WHERE `nickname` LIKE ? AND `lastname` LIKE ?",
 			wantArgs:  []interface{}{"foo", "a8m%", "%mash%"},
 		},
+		{
+			input: Select().
+				From(Table("users")).
+				Where(EqualFold("name", "Alex")),
+			wantQuery: "SELECT * FROM `users` WHERE LOWER(`name`) = ?",
+			wantArgs:  []interface{}{"alex"},
+		},
+		{
+			input: Select().
+				From(Table("users")).
+				Where(EqualFold("name", "BAR").Or().EqualFold("name", "BAZ")),
+			wantQuery: "SELECT * FROM `users` WHERE LOWER(`name`) = ? OR LOWER(`name`) = ?",
+			wantArgs:  []interface{}{"bar", "baz"},
+		},
 		{
 			input: Select().
 				From(Table("users")).