1 files changed, 40 insertions, 0 deletions
diff --git a/internal/db/bundb/migrations/util.go b/internal/db/bundb/migrations/util.go
new file mode 100644
index 000000000..47de09e23
--- /dev/null
+++ b/internal/db/bundb/migrations/util.go
@@ -0,0 +1,40 @@
+// GoToSocial
+// Copyright (C) GoToSocial Authors admin@gotosocial.org
+// SPDX-License-Identifier: AGPL-3.0-or-later
+//
+// 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 migrations
+
+import (
+	"context"
+
+	"github.com/uptrace/bun"
+	"github.com/uptrace/bun/dialect"
+)
+
+// doesColumnExist safely checks whether given column exists on table, handling both SQLite and PostgreSQL appropriately.
+func doesColumnExist(ctx context.Context, tx bun.Tx, table, col string) (bool, error) {
+	var n int
+	var err error
+	switch tx.Dialect().Name() {
+	case dialect.SQLite:
+		err = tx.NewRaw("SELECT COUNT(*) FROM pragma_table_info(?) WHERE name=?", table, col).Scan(ctx, &n)
+	case dialect.PG:
+		err = tx.NewRaw("SELECT COUNT(*) FROM information_schema.columns WHERE table_name=? and column_name=?", table, col).Scan(ctx, &n)
+	default:
+		panic("unexpected dialect")
+	}
+	return (n > 0), err
+}