Fix bug in getting merged pull request by commit (#32079) (#32117)

Backport #32079

Fix #32027

routers/api/v1/api.go

@@ -1274,6 +1274,8 @@ func Routes() *web.Route {
 					m.Group("/{ref}", func() {
 						m.Get("/status", repo.GetCombinedCommitStatusByRef)
 						m.Get("/statuses", repo.GetCommitStatusesByRef)
+					}, context.ReferencesGitRepo())
+					m.Group("/{sha}", func() {
 						m.Get("/pull", repo.GetCommitPullRequest)
 					}, context.ReferencesGitRepo())
 				}, reqRepoReader(unit.TypeCode))

routers/api/v1/repo/commits.go

@@ -325,11 +325,11 @@ func DownloadCommitDiffOrPatch(ctx *context.APIContext) {
 	}
 }
 
-// GetCommitPullRequest returns the pull request of the commit
+// GetCommitPullRequest returns the merged pull request of the commit
 func GetCommitPullRequest(ctx *context.APIContext) {
 	// swagger:operation GET /repos/{owner}/{repo}/commits/{sha}/pull repository repoGetCommitPullRequest
 	// ---
-	// summary: Get the pull request of the commit
+	// summary: Get the merged pull request of the commit
 	// produces:
 	// - application/json
 	// parameters:
@@ -354,7 +354,7 @@ func GetCommitPullRequest(ctx *context.APIContext) {
 	//   "404":
 	//     "$ref": "#/responses/notFound"
 
-	pr, err := issues_model.GetPullRequestByMergedCommit(ctx, ctx.Repo.Repository.ID, ctx.Params(":sha"))
+	pr, err := issues_model.GetPullRequestByMergedCommit(ctx, ctx.Repo.Repository.ID, ctx.Params("sha"))
 	if err != nil {
 		if issues_model.IsErrPullRequestNotExist(err) {
 			ctx.Error(http.StatusNotFound, "GetPullRequestByMergedCommit", err)