t.Fatalf("no error should happen when rename index, but got %v", err)
	}

	if !DB.Migrator().HasIndex(&IndexStruct{}, "idx_users_name_1") {
		t.Fatalf("Should find index for user's name after rename")
	}

	if err := DB.Migrator().DropIndex(&IndexStruct{}, "idx_users_name_1"); err != nil {