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- // Copyright 2021 The Gitea Authors. All rights reserved.
- // Use of this source code is governed by a MIT-style
- // license that can be found in the LICENSE file.
-
- package migrations
-
- import (
- "fmt"
-
- "xorm.io/xorm"
- )
-
- // deleteOrphanedIssueLabels looks through the database for issue_labels where the label no longer exists and deletes them.
- func deleteOrphanedIssueLabels(x *xorm.Engine) error {
- type IssueLabel struct {
- ID int64 `xorm:"pk autoincr"`
- IssueID int64 `xorm:"UNIQUE(s)"`
- LabelID int64 `xorm:"UNIQUE(s)"`
- }
-
- sess := x.NewSession()
- defer sess.Close()
- if err := sess.Begin(); err != nil {
- return err
- }
-
- if err := sess.Sync2(new(IssueLabel)); err != nil {
- return fmt.Errorf("Sync2: %v", err)
- }
-
- if _, err := sess.Exec(`DELETE FROM issue_label WHERE issue_label.id IN (
- SELECT ill.id FROM (
- SELECT il.id
- FROM issue_label AS il
- LEFT JOIN label ON il.label_id = label.id
- WHERE
- label.id IS NULL
- ) AS ill)`); err != nil {
- return err
- }
-
- return sess.Commit()
- }
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