Use OldRef instead of CommitSHA for DeleteBranch comments (#14604)

Fix #14545

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

models/issue.go

@@ -749,7 +749,7 @@ func AddDeletePRBranchComment(doer *User, repo *Repository, issueID int64, branc
 		Doer:   doer,
 		Repo:   repo,
 		Issue:  issue,
-		CommitSHA: branchName,
+		OldRef: branchName,
 	}
 	if _, err = createComment(sess, opts); err != nil {
 		return err

models/migrations/migrations.go

@@ -284,6 +284,8 @@ var migrations = []Migration{
 	NewMigration("Add user redirect", addUserRedirect),
 	// v168 -> v169
 	NewMigration("Recreate user table to fix default values", recreateUserTableToFixDefaultValues),
+	// v169 -> v170
+	NewMigration("Update DeleteBranch comments to set the old_ref to the commit_sha", commentTypeDeleteBranchUseOldRef),
 }
 
 // GetCurrentDBVersion returns the current db version

models/migrations/v169.go

@@ -0,0 +1,14 @@
+// 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 (
+	"xorm.io/xorm"
+)
+
+func commentTypeDeleteBranchUseOldRef(x *xorm.Engine) error {
+	_, err := x.Exec("UPDATE comment SET old_ref = commit_sha, commit_sha = '' WHERE type = 11")
+	return err
+}

templates/repo/issue/view_content/comments.tmpl

@@ -251,7 +251,7 @@
 			</a>
 			<span class="text grey">
 				<a class="author" href="{{.Poster.HomeLink}}">{{.Poster.GetDisplayName}}</a>
-				{{$.i18n.Tr "repo.issues.delete_branch_at" (.CommitSHA|Escape) $createdStr | Safe}}
+				{{$.i18n.Tr "repo.issues.delete_branch_at" (.OldRef|Escape) $createdStr | Safe}}
 			</span>
 		</div>
 	{{else if eq .Type 12}}