Fix repository's pull request count error (#7518)

* fix pr count error

* fix tests

models/issue.go

 func (issue *Issue) BlockingDependencies() ([]*Issue, error) {
 	return issue.getBlockingDependencies(x)
 }
+
+func (issue *Issue) updateClosedNum(e Engine) (err error) {
+	if issue.IsPull {
+		_, err = e.Exec("UPDATE `repository` SET num_closed_pulls=(SELECT count(*) FROM issue WHERE repo_id=? AND is_pull=? AND is_closed=?) WHERE id=?",
+			issue.RepoID,
+			true,
+			true,
+			issue.RepoID,
+		)
+	} else {
+		_, err = e.Exec("UPDATE `repository` SET num_closed_issues=(SELECT count(*) FROM issue WHERE repo_id=? AND is_pull=? AND is_closed=?) WHERE id=?",
+			issue.RepoID,
+			false,
+			true,
+			issue.RepoID,
+		)
+	}
+	return
+}

models/issue_comment.go

 			act.OpType = ActionReopenPullRequest
 		}
 
-		if opts.Issue.IsPull {
-			_, err = e.Exec("UPDATE `repository` SET num_closed_pulls=num_closed_pulls-1 WHERE id=?", opts.Repo.ID)
-		} else {
-			_, err = e.Exec("UPDATE `repository` SET num_closed_issues=num_closed_issues-1 WHERE id=?", opts.Repo.ID)
-		}
-		if err != nil {
+		if err = opts.Issue.updateClosedNum(e); err != nil {
 			return err
 		}
 
 			act.OpType = ActionClosePullRequest
 		}
 
-		if opts.Issue.IsPull {
-			_, err = e.Exec("UPDATE `repository` SET num_closed_pulls=num_closed_pulls+1 WHERE id=?", opts.Repo.ID)
-		} else {
-			_, err = e.Exec("UPDATE `repository` SET num_closed_issues=num_closed_issues+1 WHERE id=?", opts.Repo.ID)
-		}
-		if err != nil {
+		if err = opts.Issue.updateClosedNum(e); err != nil {
 			return err
 		}
 	}

models/repo.go

 	}
 	// ***** END: Repository.NumClosedIssues *****
 
+	// ***** START: Repository.NumClosedPulls *****
+	desc = "repository count 'num_closed_pulls'"
+	results, err = x.Query("SELECT repo.id FROM `repository` repo WHERE repo.num_closed_pulls!=(SELECT COUNT(*) FROM `issue` WHERE repo_id=repo.id AND is_closed=? AND is_pull=?)", true, true)
+	if err != nil {
+		log.Error("Select %s: %v", desc, err)
+	} else {
+		for _, result := range results {
+			id := com.StrTo(result["id"]).MustInt64()
+			log.Trace("Updating %s: %d", desc, id)
+			_, err = x.Exec("UPDATE `repository` SET num_closed_pulls=(SELECT COUNT(*) FROM `issue` WHERE repo_id=? AND is_closed=? AND is_pull=?) WHERE id=?", id, true, true, id)
+			if err != nil {
+				log.Error("Update %s[%d]: %v", desc, id, err)
+			}
+		}
+	}
+	// ***** END: Repository.NumClosedPulls *****
+
 	// FIXME: use checker when stop supporting old fork repo format.
 	// ***** START: Repository.NumForks *****
 	results, err = x.Query("SELECT repo.id FROM `repository` repo WHERE repo.num_forks!=(SELECT COUNT(*) FROM `repository` WHERE fork_id=repo.id)")