From dcb3ddb5c5e092f49ed0e495e4973a6205ebb177 Mon Sep 17 00:00:00 2001
From: Guillermo Prandi <guillep2k@users.noreply.github.com>
Date: Fri, 27 Sep 2019 18:56:17 -0300
Subject: [PATCH] Revert #7898

---
 models/issue.go             | 52 +++++++++++++++++++++----------------
 routers/api/v1/repo/pull.go |  7 +++++
 routers/repo/pull.go        |  7 +++++
 3 files changed, 43 insertions(+), 23 deletions(-)

diff --git a/models/issue.go b/models/issue.go
index 77712c0fec72e..eea39fb2c5bae 100644
--- a/models/issue.go
+++ b/models/issue.go
@@ -5,6 +5,7 @@
 package models
 
 import (
+	"errors"
 	"fmt"
 	"path"
 	"regexp"
@@ -73,7 +74,6 @@ var (
 
 const issueTasksRegexpStr = `(^\s*[-*]\s\[[\sx]\]\s.)|(\n\s*[-*]\s\[[\sx]\]\s.)`
 const issueTasksDoneRegexpStr = `(^\s*[-*]\s\[[x]\]\s.)|(\n\s*[-*]\s\[[x]\]\s.)`
-const issueMaxDupIndexAttempts = 3
 
 func init() {
 	issueTasksPat = regexp.MustCompile(issueTasksRegexpStr)
@@ -1053,9 +1053,36 @@ type NewIssueOptions struct {
 	IsPull      bool
 }
 
+// GetMaxIndexOfIssue returns the max index on issue
+func GetMaxIndexOfIssue(repoID int64) (int64, error) {
+	return getMaxIndexOfIssue(x, repoID)
+}
+
+func getMaxIndexOfIssue(e Engine, repoID int64) (int64, error) {
+	var (
+		maxIndex int64
+		has      bool
+		err      error
+	)
+
+	has, err = e.SQL("SELECT COALESCE((SELECT MAX(`index`) FROM issue WHERE repo_id = ?),0)", repoID).Get(&maxIndex)
+	if err != nil {
+		return 0, err
+	} else if !has {
+		return 0, errors.New("Retrieve Max index from issue failed")
+	}
+	return maxIndex, nil
+}
+
 func newIssue(e *xorm.Session, doer *User, opts NewIssueOptions) (err error) {
 	opts.Issue.Title = strings.TrimSpace(opts.Issue.Title)
 
+	maxIndex, err := getMaxIndexOfIssue(e, opts.Issue.RepoID)
+	if err != nil {
+		return err
+	}
+	opts.Issue.Index = maxIndex + 1
+
 	if opts.Issue.MilestoneID > 0 {
 		milestone, err := getMilestoneByRepoID(e, opts.Issue.RepoID, opts.Issue.MilestoneID)
 		if err != nil && !IsErrMilestoneNotExist(err) {
@@ -1104,31 +1131,10 @@ func newIssue(e *xorm.Session, doer *User, opts NewIssueOptions) (err error) {
 	}
 
 	// Milestone and assignee validation should happen before insert actual object.
-
-	// There's no good way to identify a duplicate key error in database/sql; brute force some retries
-	dupIndexAttempts := issueMaxDupIndexAttempts
-	for {
-		_, err := e.SetExpr("`index`", "coalesce(MAX(`index`),0)+1").
-			Where("repo_id=?", opts.Issue.RepoID).
-			Insert(opts.Issue)
-		if err == nil {
-			break
-		}
-
-		dupIndexAttempts--
-		if dupIndexAttempts <= 0 {
-			return err
-		}
-	}
-
-	inserted, err := getIssueByID(e, opts.Issue.ID)
-	if err != nil {
+	if _, err = e.Insert(opts.Issue); err != nil {
 		return err
 	}
 
-	// Patch Index with the value calculated by the database
-	opts.Issue.Index = inserted.Index
-
 	if opts.Issue.MilestoneID > 0 {
 		if err = changeMilestoneAssign(e, doer, opts.Issue, -1); err != nil {
 			return err
diff --git a/routers/api/v1/repo/pull.go b/routers/api/v1/repo/pull.go
index 0f9eab2f5029d..370a95eabff1c 100644
--- a/routers/api/v1/repo/pull.go
+++ b/routers/api/v1/repo/pull.go
@@ -254,8 +254,15 @@ func CreatePullRequest(ctx *context.APIContext, form api.CreatePullRequestOption
 		deadlineUnix = timeutil.TimeStamp(form.Deadline.Unix())
 	}
 
+	maxIndex, err := models.GetMaxIndexOfIssue(repo.ID)
+	if err != nil {
+		ctx.ServerError("GetPatch", err)
+		return
+	}
+
 	prIssue := &models.Issue{
 		RepoID:       repo.ID,
+		Index:        maxIndex + 1,
 		Title:        form.Title,
 		PosterID:     ctx.User.ID,
 		Poster:       ctx.User,
diff --git a/routers/repo/pull.go b/routers/repo/pull.go
index 180d592e3dbf8..f6332d0d5d204 100644
--- a/routers/repo/pull.go
+++ b/routers/repo/pull.go
@@ -766,8 +766,15 @@ func CompareAndPullRequestPost(ctx *context.Context, form auth.CreateIssueForm)
 		return
 	}
 
+	maxIndex, err := models.GetMaxIndexOfIssue(repo.ID)
+	if err != nil {
+		ctx.ServerError("GetPatch", err)
+		return
+	}
+
 	pullIssue := &models.Issue{
 		RepoID:      repo.ID,
+		Index:       maxIndex + 1,
 		Title:       form.Title,
 		PosterID:    ctx.User.ID,
 		Poster:      ctx.User,