code.gitea.io/gitea@v1.21.7/models/migrations/v1_14/v177.go (about)

     1  // Copyright 2021 The Gitea Authors. All rights reserved.
     2  // SPDX-License-Identifier: MIT
     3  
     4  package v1_14 //nolint
     5  
     6  import (
     7  	"fmt"
     8  
     9  	"xorm.io/xorm"
    10  )
    11  
    12  // DeleteOrphanedIssueLabels looks through the database for issue_labels where the label no longer exists and deletes them.
    13  func DeleteOrphanedIssueLabels(x *xorm.Engine) error {
    14  	type IssueLabel struct {
    15  		ID      int64 `xorm:"pk autoincr"`
    16  		IssueID int64 `xorm:"UNIQUE(s)"`
    17  		LabelID int64 `xorm:"UNIQUE(s)"`
    18  	}
    19  
    20  	sess := x.NewSession()
    21  	defer sess.Close()
    22  	if err := sess.Begin(); err != nil {
    23  		return err
    24  	}
    25  
    26  	if err := sess.Sync(new(IssueLabel)); err != nil {
    27  		return fmt.Errorf("Sync: %w", err)
    28  	}
    29  
    30  	if _, err := sess.Exec(`DELETE FROM issue_label WHERE issue_label.id IN (
    31  		SELECT ill.id FROM (
    32  			SELECT il.id
    33  			FROM issue_label AS il
    34  				LEFT JOIN label ON il.label_id = label.id
    35  			WHERE
    36  				label.id IS NULL
    37  		) AS ill)`); err != nil {
    38  		return err
    39  	}
    40  
    41  	return sess.Commit()
    42  }