fix bugs when too many IN variables (#4594)

models/issue_list.go

@@ -9,6 +9,11 @@ import "fmt"
 // IssueList defines a list of issues
 type IssueList []*Issue
 
+const (
+	// default variables number on IN () in SQL
+	defaultMaxInSize = 50
+)
+
 func (issues IssueList) getRepoIDs() []int64 {
 	repoIDs := make(map[int64]struct{}, len(issues))
 	for _, issue := range issues {
@@ -26,12 +31,21 @@ func (issues IssueList) loadRepositories(e Engine) ([]*Repository, error) {
 
 	repoIDs := issues.getRepoIDs()
 	repoMaps := make(map[int64]*Repository, len(repoIDs))
+	var left = len(repoIDs)
+	for left > 0 {
+		var limit = defaultMaxInSize
+		if left < limit {
+			limit = left
+		}
 		err := e.
-		In("id", repoIDs).
+			In("id", repoIDs[:limit]).
 			Find(&repoMaps)
 		if err != nil {
 			return nil, fmt.Errorf("find repository: %v", err)
 		}
+		left = left - limit
+		repoIDs = repoIDs[limit:]
+	}
 
 	for _, issue := range issues {
 		issue.Repo = repoMaps[issue.RepoID]
@@ -61,12 +75,21 @@ func (issues IssueList) loadPosters(e Engine) error {
 
 	posterIDs := issues.getPosterIDs()
 	posterMaps := make(map[int64]*User, len(posterIDs))
+	var left = len(posterIDs)
+	for left > 0 {
+		var limit = defaultMaxInSize
+		if left < limit {
+			limit = left
+		}
 		err := e.
-		In("id", posterIDs).
+			In("id", posterIDs[:limit]).
 			Find(&posterMaps)
 		if err != nil {
 			return err
 		}
+		left = left - limit
+		posterIDs = posterIDs[limit:]
+	}
 
 	for _, issue := range issues {
 		if issue.PosterID <= 0 {
@@ -99,24 +122,35 @@ func (issues IssueList) loadLabels(e Engine) error {
 	}
 
 	var issueLabels = make(map[int64][]*Label, len(issues)*3)
+	var issueIDs = issues.getIssueIDs()
+	var left = len(issueIDs)
+	for left > 0 {
+		var limit = defaultMaxInSize
+		if left < limit {
+			limit = left
+		}
 		rows, err := e.Table("label").
 			Join("LEFT", "issue_label", "issue_label.label_id = label.id").
-		In("issue_label.issue_id", issues.getIssueIDs()).
+			In("issue_label.issue_id", issueIDs[:limit]).
 			Asc("label.name").
 			Rows(new(LabelIssue))
 		if err != nil {
 			return err
 		}
-	defer rows.Close()
 
 		for rows.Next() {
 			var labelIssue LabelIssue
 			err = rows.Scan(&labelIssue)
 			if err != nil {
+				rows.Close()
 				return err
 			}
 			issueLabels[labelIssue.IssueLabel.IssueID] = append(issueLabels[labelIssue.IssueLabel.IssueID], labelIssue.Label)
 		}
+		rows.Close()
+		left = left - limit
+		issueIDs = issueIDs[limit:]
+	}
 
 	for _, issue := range issues {
 		issue.Labels = issueLabels[issue.ID]
@@ -141,12 +175,21 @@ func (issues IssueList) loadMilestones(e Engine) error {
 	}
 
 	milestoneMaps := make(map[int64]*Milestone, len(milestoneIDs))
+	var left = len(milestoneIDs)
+	for left > 0 {
+		var limit = defaultMaxInSize
+		if left < limit {
+			limit = left
+		}
 		err := e.
-		In("id", milestoneIDs).
+			In("id", milestoneIDs[:limit]).
 			Find(&milestoneMaps)
 		if err != nil {
 			return err
 		}
+		left = left - limit
+		milestoneIDs = milestoneIDs[limit:]
+	}
 
 	for _, issue := range issues {
 		issue.Milestone = milestoneMaps[issue.MilestoneID]
@@ -165,24 +208,36 @@ func (issues IssueList) loadAssignees(e Engine) error {
 	}
 
 	var assignees = make(map[int64][]*User, len(issues))
+	var issueIDs = issues.getIssueIDs()
+	var left = len(issueIDs)
+	for left > 0 {
+		var limit = defaultMaxInSize
+		if left < limit {
+			limit = left
+		}
 		rows, err := e.Table("issue_assignees").
 			Join("INNER", "`user`", "`user`.id = `issue_assignees`.assignee_id").
-		In("`issue_assignees`.issue_id", issues.getIssueIDs()).
+			In("`issue_assignees`.issue_id", issueIDs[:limit]).
 			Rows(new(AssigneeIssue))
 		if err != nil {
 			return err
 		}
-	defer rows.Close()
 
 		for rows.Next() {
 			var assigneeIssue AssigneeIssue
 			err = rows.Scan(&assigneeIssue)
 			if err != nil {
+				rows.Close()
 				return err
 			}
 
 			assignees[assigneeIssue.IssueAssignee.IssueID] = append(assignees[assigneeIssue.IssueAssignee.IssueID], assigneeIssue.Assignee)
 		}
+		rows.Close()
+
+		left = left - limit
+		issueIDs = issueIDs[limit:]
+	}
 
 	for _, issue := range issues {
 		issue.Assignees = assignees[issue.ID]
@@ -207,23 +262,34 @@ func (issues IssueList) loadPullRequests(e Engine) error {
 	}
 
 	pullRequestMaps := make(map[int64]*PullRequest, len(issuesIDs))
+	var left = len(issuesIDs)
+	for left > 0 {
+		var limit = defaultMaxInSize
+		if left < limit {
+			limit = left
+		}
 		rows, err := e.
-		In("issue_id", issuesIDs).
+			In("issue_id", issuesIDs[:limit]).
 			Rows(new(PullRequest))
 		if err != nil {
 			return err
 		}
-	defer rows.Close()
 
 		for rows.Next() {
 			var pr PullRequest
 			err = rows.Scan(&pr)
 			if err != nil {
+				rows.Close()
 				return err
 			}
 			pullRequestMaps[pr.IssueID] = &pr
 		}
 
+		rows.Close()
+		left = left - limit
+		issuesIDs = issuesIDs[limit:]
+	}
+
 	for _, issue := range issues {
 		issue.PullRequest = pullRequestMaps[issue.ID]
 	}
@@ -236,24 +302,36 @@ func (issues IssueList) loadAttachments(e Engine) (err error) {
 	}
 
 	var attachments = make(map[int64][]*Attachment, len(issues))
+	var issuesIDs = issues.getIssueIDs()
+	var left = len(issuesIDs)
+	for left > 0 {
+		var limit = defaultMaxInSize
+		if left < limit {
+			limit = left
+		}
 		rows, err := e.Table("attachment").
 			Join("INNER", "issue", "issue.id = attachment.issue_id").
-		In("issue.id", issues.getIssueIDs()).
+			In("issue.id", issuesIDs[:limit]).
 			Rows(new(Attachment))
 		if err != nil {
 			return err
 		}
-	defer rows.Close()
 
 		for rows.Next() {
 			var attachment Attachment
 			err = rows.Scan(&attachment)
 			if err != nil {
+				rows.Close()
 				return err
 			}
 			attachments[attachment.IssueID] = append(attachments[attachment.IssueID], &attachment)
 		}
 
+		rows.Close()
+		left = left - limit
+		issuesIDs = issuesIDs[limit:]
+	}
+
 	for _, issue := range issues {
 		issue.Attachments = attachments[issue.ID]
 	}
@@ -266,23 +344,34 @@ func (issues IssueList) loadComments(e Engine) (err error) {
 	}
 
 	var comments = make(map[int64][]*Comment, len(issues))
+	var issuesIDs = issues.getIssueIDs()
+	var left = len(issuesIDs)
+	for left > 0 {
+		var limit = defaultMaxInSize
+		if left < limit {
+			limit = left
+		}
 		rows, err := e.Table("comment").
 			Join("INNER", "issue", "issue.id = comment.issue_id").
-		In("issue.id", issues.getIssueIDs()).
+			In("issue.id", issuesIDs[:limit]).
 			Rows(new(Comment))
 		if err != nil {
 			return err
 		}
-	defer rows.Close()
 
 		for rows.Next() {
 			var comment Comment
 			err = rows.Scan(&comment)
 			if err != nil {
+				rows.Close()
 				return err
 			}
 			comments[comment.IssueID] = append(comments[comment.IssueID], &comment)
 		}
+		rows.Close()
+		left = left - limit
+		issuesIDs = issuesIDs[limit:]
+	}
 
 	for _, issue := range issues {
 		issue.Comments = comments[issue.ID]
@@ -307,26 +396,36 @@ func (issues IssueList) loadTotalTrackedTimes(e Engine) (err error) {
 		}
 	}
 
+	var left = len(ids)
+	for left > 0 {
+		var limit = defaultMaxInSize
+		if left < limit {
+			limit = left
+		}
+
 		// select issue_id, sum(time) from tracked_time where issue_id in (<issue ids in current page>) group by issue_id
 		rows, err := e.Table("tracked_time").
 			Select("issue_id, sum(time) as time").
-		In("issue_id", ids).
+			In("issue_id", ids[:limit]).
 			GroupBy("issue_id").
 			Rows(new(totalTimesByIssue))
 		if err != nil {
 			return err
 		}
 
-	defer rows.Close()
-
 		for rows.Next() {
 			var totalTime totalTimesByIssue
 			err = rows.Scan(&totalTime)
 			if err != nil {
+				rows.Close()
 				return err
 			}
 			trackedTimes[totalTime.IssueID] = totalTime.Time
 		}
+		rows.Close()
+		left = left - limit
+		ids = ids[limit:]
+	}
 
 	for _, issue := range issues {
 		issue.TotalTrackedTime = trackedTimes[issue.ID]