Rework suggestion backend

models/issues/issue.go

@@ -501,6 +501,29 @@ func GetIssueByIndex(ctx context.Context, repoID, index int64) (*Issue, error) {
 	return issue, nil
 }
 
+func FindIssuesWithIndexPrefix(ctx context.Context, repoID, index int64, pageSize int) ([]*Issue, error) {
+	issues := make([]*Issue, 0, pageSize)
+	var cond string
+	switch {
+	case setting.Database.Type.IsSQLite3():
+		cond = "CAST(`index` AS TEXT) LIKE ?"
+	case setting.Database.Type.IsMySQL():
+		cond = "CAST(`index` AS CHAR) LIKE ?"
+	case setting.Database.Type.IsPostgreSQL():
+		cond = "index::TEXT LIKE ?"
+	case setting.Database.Type.IsMSSQL():
+		cond = "CAST([index] AS VARCHAR) LIKE ?"
+	}
+
+	err := db.GetEngine(ctx).Where("repo_id = ?", repoID).
+		And("`index` <> ?", index).
+		And(cond, fmt.Sprintf("%d%%", index)).
+		OrderBy("`index` ASC").
+		Limit(pageSize).
+		Find(&issues)
+	return issues, err
+}
+
 // GetIssueWithAttrsByIndex returns issue by index in a repository.
 func GetIssueWithAttrsByIndex(ctx context.Context, repoID, index int64) (*Issue, error) {
 	issue, err := GetIssueByIndex(ctx, repoID, index)

routers/web/repo/issue_suggestions.go

@@ -5,6 +5,8 @@ package repo
 
 import (
 	"net/http"
+	"sort"
+	"strconv"
 
 	"code.gitea.io/gitea/models/db"
 	issues_model "code.gitea.io/gitea/models/issues"
@@ -29,31 +31,78 @@ func IssueSuggestions(ctx *context.Context) {
 		isPull = optional.Some(false)
 	}
 
-	searchOpt := &issue_indexer.SearchOptions{
-		Paginator: &db.ListOptions{
-			Page:     0,
-			PageSize: 5,
-		},
-		Keyword:  keyword,
-		RepoIDs:  []int64{ctx.Repo.Repository.ID},
-		IsPull:   isPull,
-		IsClosed: nil,
-		SortBy:   issue_indexer.SortByUpdatedDesc,
+	indexKeyword, _ := strconv.ParseInt(keyword, 10, 64)
+	pageSize := 5
+	issues := make(issues_model.IssueList, 0, pageSize)
+	if indexKeyword > 0 {
+		issue, err := issues_model.GetIssueByIndex(ctx, ctx.Repo.Repository.ID, indexKeyword)
+		if err != nil && !issues_model.IsErrIssueNotExist(err) {
+			ctx.ServerError("GetIssueByIndex", err)
+			return
+		}
+		if issue != nil {
+			pageSize--
+		}
+
+		issues, err = issues_model.FindIssuesWithIndexPrefix(ctx, ctx.Repo.Repository.ID, indexKeyword, pageSize)
+		if err != nil {
+			ctx.ServerError("FindIssuesWithIndexPrefix", err)
+			return
+		}
+		pageSize -= len(issues)
+		if issue != nil {
+			issues = append([]*issues_model.Issue{issue}, issues...)
+		}
 	}
 
-	ids, _, err := issue_indexer.SearchIssues(ctx, searchOpt)
-	if err != nil {
-		ctx.ServerError("SearchIssues", err)
-		return
+	if pageSize > 0 {
+		searchOpt := &issue_indexer.SearchOptions{
+			Paginator: &db.ListOptions{
+				Page:     0,
+				PageSize: pageSize,
+			},
+			Keyword:  keyword,
+			RepoIDs:  []int64{ctx.Repo.Repository.ID},
+			IsPull:   isPull,
+			IsClosed: nil,
+			SortBy:   issue_indexer.SortByUpdatedDesc,
+		}
+
+		ids, _, err := issue_indexer.SearchIssues(ctx, searchOpt)
+		if err != nil {
+			ctx.ServerError("SearchIssues", err)
+			return
+		}
+
+		for i := 0; i < len(ids); i++ {
+			for _, issue := range issues {
+				if ids[i] == issue.ID {
+					ids = append(ids[:i], ids[i+1:]...)
+					i--
+					break
+				}
+			}
+		}
+
+		if len(ids) > 0 {
+			newIssues, err := issues_model.GetIssuesByIDs(ctx, ids, true)
+			if err != nil {
+				ctx.ServerError("FindIssuesByIDs", err)
+				return
+			}
+			sort.Slice(newIssues, func(i, j int) bool {
+				return newIssues[i].Index > newIssues[j].Index
+			})
+			issues = append(issues, newIssues...)
+		}
 	}
-	issues, err := issues_model.GetIssuesByIDs(ctx, ids, true)
-	if err != nil {
-		ctx.ServerError("FindIssuesByIDs", err)
+
+	if err := issues.LoadPullRequests(ctx); err != nil {
+		ctx.ServerError("LoadPullRequests", err)
 		return
 	}
 
 	suggestions := make([]*structs.Issue, 0, len(issues))
-
 	for _, issue := range issues {
 		suggestion := &structs.Issue{
 			ID:    issue.ID,
@@ -62,16 +111,10 @@ func IssueSuggestions(ctx *context.Context) {
 			State: issue.State(),
 		}
 
-		if issue.IsPull {
-			if err := issue.LoadPullRequest(ctx); err != nil {
-				ctx.ServerError("LoadPullRequest", err)
-				return
-			}
-			if issue.PullRequest != nil {
-				suggestion.PullRequest = &structs.PullRequestMeta{
-					HasMerged:        issue.PullRequest.HasMerged,
-					IsWorkInProgress: issue.PullRequest.IsWorkInProgress(ctx),
-				}
+		if issue.IsPull && issue.PullRequest != nil {
+			suggestion.PullRequest = &structs.PullRequestMeta{
+				HasMerged:        issue.PullRequest.HasMerged,
+				IsWorkInProgress: issue.PullRequest.IsWorkInProgress(ctx),
 			}
 		}