Pg to bun (#148)

* start moving to bun

* changing more stuff

* more

* and yet more

* tests passing

* seems stable now

* more big changes

* small fix

* little fixes

internal/db/bundb/media.go

@@ -0,0 +1,53 @@
+/*
+   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 (
+	"context"
+
+	"github.com/sirupsen/logrus"
+	"github.com/superseriousbusiness/gotosocial/internal/config"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/uptrace/bun"
+)
+
+type mediaDB struct {
+	config *config.Config
+	conn   *bun.DB
+	log    *logrus.Logger
+}
+
+func (m *mediaDB) newMediaQ(i interface{}) *bun.SelectQuery {
+	return m.conn.
+		NewSelect().
+		Model(i).
+		Relation("Account")
+}
+
+func (m *mediaDB) GetAttachmentByID(ctx context.Context, id string) (*gtsmodel.MediaAttachment, db.Error) {
+	attachment := &gtsmodel.MediaAttachment{}
+
+	q := m.newMediaQ(attachment).
+		Where("media_attachment.id = ?", id)
+
+	err := processErrorResponse(q.Scan(ctx))
+
+	return attachment, err
+}