/*
   GoToSocial
   Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU Affero General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU Affero General Public License for more details.

   You should have received a copy of the GNU Affero General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package bundb

import (
	"github.com/uptrace/bun"
)

// whereEmptyOrNull is a convenience function to return a bun WhereGroup that specifies
// that the given column should be EITHER an empty string OR null.
//
// Use it as follows:
//
//   q = q.WhereGroup(" AND ", whereEmptyOrNull("whatever_column"))
func whereEmptyOrNull(column string) func(*bun.SelectQuery) *bun.SelectQuery {
	return func(q *bun.SelectQuery) *bun.SelectQuery {
		return q.
			WhereOr("? IS NULL", bun.Ident(column)).
			WhereOr("? = ''", bun.Ident(column))
	}
}