Add API to get merged PR of a commit (#29243)

Adds a new API `/repos/{owner}/{repo}/commits/{sha}/pull` that allows
you to get the merged PR associated to a commit.

---------

Co-authored-by: 6543 <6543@obermui.de>

models/issues/pull.go

@@ -1093,3 +1093,23 @@ func InsertPullRequests(ctx context.Context, prs ...*PullRequest) error {
 	}
 	return committer.Commit()
 }
+
+// GetPullRequestByMergedCommit returns a merged pull request by the given commit
+func GetPullRequestByMergedCommit(ctx context.Context, repoID int64, sha string) (*PullRequest, error) {
+	pr := new(PullRequest)
+	has, err := db.GetEngine(ctx).Where("base_repo_id = ? AND merged_commit_id = ?", repoID, sha).Get(pr)
+	if err != nil {
+		return nil, err
+	} else if !has {
+		return nil, ErrPullRequestNotExist{0, 0, 0, repoID, "", ""}
+	}
+
+	if err = pr.LoadAttributes(ctx); err != nil {
+		return nil, err
+	}
+	if err = pr.LoadIssue(ctx); err != nil {
+		return nil, err
+	}
+
+	return pr, nil
+}

models/issues/pull_test.go

@@ -339,6 +339,18 @@ func TestGetApprovers(t *testing.T) {
 	assert.EqualValues(t, expected, approvers)
 }
 
+func TestGetPullRequestByMergedCommit(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	pr, err := issues_model.GetPullRequestByMergedCommit(db.DefaultContext, 1, "1a8823cd1a9549fde083f992f6b9b87a7ab74fb3")
+	assert.NoError(t, err)
+	assert.EqualValues(t, 1, pr.ID)
+
+	_, err = issues_model.GetPullRequestByMergedCommit(db.DefaultContext, 0, "1a8823cd1a9549fde083f992f6b9b87a7ab74fb3")
+	assert.ErrorAs(t, err, &issues_model.ErrPullRequestNotExist{})
+	_, err = issues_model.GetPullRequestByMergedCommit(db.DefaultContext, 1, "")
+	assert.ErrorAs(t, err, &issues_model.ErrPullRequestNotExist{})
+}
+
 func TestMigrate_InsertPullRequests(t *testing.T) {
 	assert.NoError(t, unittest.PrepareTestDatabase())
 	reponame := "repo1"