Allow filtering issues by any assignee (#33343)

This is the opposite of the "No assignee" filter, it will match all
issues that have at least one assignee.

Before
![Before
change](https://github.com/user-attachments/assets/4aea194b-9add-4a84-8d6b-61bfd8d9e58e)

After
![After change with any
filter](https://github.com/user-attachments/assets/99f1205d-ba9f-4a0a-a60b-cc1a0c0823fe)

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

routers/web/org/projects.go

@@ -347,11 +347,11 @@ func ViewProject(ctx *context.Context) {
 	if ctx.Written() {
 		return
 	}
-	assigneeID := ctx.FormInt64("assignee") // TODO: use "optional" but not 0 in the future
+	assigneeID := ctx.FormString("assignee")
 
 	opts := issues_model.IssuesOptions{
 		LabelIDs:   labelIDs,
-		AssigneeID: optional.Some(assigneeID),
+		AssigneeID: assigneeID,
 		Owner:      project.Owner,
 		Doer:       ctx.Doer,
 	}

routers/web/repo/issue_list.go

@@ -208,10 +208,10 @@ func SearchIssues(ctx *context.Context) {
 	if ctx.IsSigned {
 		ctxUserID := ctx.Doer.ID
 		if ctx.FormBool("created") {
-			searchOpt.PosterID = optional.Some(ctxUserID)
+			searchOpt.PosterID = strconv.FormatInt(ctxUserID, 10)
 		}
 		if ctx.FormBool("assigned") {
-			searchOpt.AssigneeID = optional.Some(ctxUserID)
+			searchOpt.AssigneeID = strconv.FormatInt(ctxUserID, 10)
 		}
 		if ctx.FormBool("mentioned") {
 			searchOpt.MentionID = optional.Some(ctxUserID)
@@ -373,10 +373,10 @@ func SearchRepoIssuesJSON(ctx *context.Context) {
 	}
 
 	if createdByID > 0 {
-		searchOpt.PosterID = optional.Some(createdByID)
+		searchOpt.PosterID = strconv.FormatInt(createdByID, 10)
 	}
 	if assignedByID > 0 {
-		searchOpt.AssigneeID = optional.Some(assignedByID)
+		searchOpt.AssigneeID = strconv.FormatInt(assignedByID, 10)
 	}
 	if mentionedByID > 0 {
 		searchOpt.MentionID = optional.Some(mentionedByID)
@@ -490,7 +490,7 @@ func issues(ctx *context.Context, milestoneID, projectID int64, isPullOption opt
 		viewType = "all"
 	}
 
-	assigneeID := ctx.FormInt64("assignee") // TODO: use "optional" but not 0 in the future
+	assigneeID := ctx.FormString("assignee")
 	posterUsername := ctx.FormString("poster")
 	posterUserID := shared_user.GetFilterUserIDByName(ctx, posterUsername)
 	var mentionedID, reviewRequestedID, reviewedID int64
@@ -498,11 +498,11 @@ func issues(ctx *context.Context, milestoneID, projectID int64, isPullOption opt
 	if ctx.IsSigned {
 		switch viewType {
 		case "created_by":
-			posterUserID = optional.Some(ctx.Doer.ID)
+			posterUserID = strconv.FormatInt(ctx.Doer.ID, 10)
 		case "mentioned":
 			mentionedID = ctx.Doer.ID
 		case "assigned":
-			assigneeID = ctx.Doer.ID
+			assigneeID = fmt.Sprint(ctx.Doer.ID)
 		case "review_requested":
 			reviewRequestedID = ctx.Doer.ID
 		case "reviewed_by":
@@ -532,7 +532,7 @@ func issues(ctx *context.Context, milestoneID, projectID int64, isPullOption opt
 		LabelIDs:          labelIDs,
 		MilestoneIDs:      mileIDs,
 		ProjectID:         projectID,
-		AssigneeID:        optional.Some(assigneeID),
+		AssigneeID:        assigneeID,
 		MentionedID:       mentionedID,
 		PosterID:          posterUserID,
 		ReviewRequestedID: reviewRequestedID,
@@ -613,7 +613,7 @@ func issues(ctx *context.Context, milestoneID, projectID int64, isPullOption opt
 				PageSize: setting.UI.IssuePagingNum,
 			},
 			RepoIDs:           []int64{repo.ID},
-			AssigneeID:        optional.Some(assigneeID),
+			AssigneeID:        assigneeID,
 			PosterID:          posterUserID,
 			MentionedID:       mentionedID,
 			ReviewRequestedID: reviewRequestedID,

routers/web/repo/projects.go

@@ -315,12 +315,12 @@ func ViewProject(ctx *context.Context) {
 
 	labelIDs := issue.PrepareFilterIssueLabels(ctx, ctx.Repo.Repository.ID, ctx.Repo.Owner)
 
-	assigneeID := ctx.FormInt64("assignee") // TODO: use "optional" but not 0 in the future
+	assigneeID := ctx.FormString("assignee")
 
 	issuesMap, err := project_service.LoadIssuesFromProject(ctx, project, &issues_model.IssuesOptions{
 		RepoIDs:    []int64{ctx.Repo.Repository.ID},
 		LabelIDs:   labelIDs,
-		AssigneeID: optional.Some(assigneeID),
+		AssigneeID: assigneeID,
 	})
 	if err != nil {
 		ctx.ServerError("LoadIssuesOfColumns", err)

routers/web/shared/user/helper.go

@@ -8,9 +8,7 @@ import (
 	"slices"
 	"strconv"
 
-	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/models/user"
-	"code.gitea.io/gitea/modules/optional"
 )
 
 func MakeSelfOnTop(doer *user.User, users []*user.User) []*user.User {
@@ -34,19 +32,20 @@ func MakeSelfOnTop(doer *user.User, users []*user.User) []*user.User {
 // So it's better to make it work like GitHub: users could input username directly.
 // Since it only converts the username to ID directly and is only used internally (to search issues), so no permission check is needed.
 // Return values:
-// * nil: no filter
-// * some(id): match the id, the id could be -1 to match the issues without assignee
-// * some(NonExistingID): match no issue (due to the user doesn't exist)
-func GetFilterUserIDByName(ctx context.Context, name string) optional.Option[int64] {
+// * "": no filter
+// * "{the-id}": match the id
+// * "(none)": match no issue (due to the user doesn't exist)
+func GetFilterUserIDByName(ctx context.Context, name string) string {
 	if name == "" {
-		return optional.None[int64]()
+		return ""
 	}
 	u, err := user.GetUserByName(ctx, name)
 	if err != nil {
 		if id, err := strconv.ParseInt(name, 10, 64); err == nil {
-			return optional.Some(id)
+			return strconv.FormatInt(id, 10)
 		}
-		return optional.Some(db.NonExistingID)
+		// The "(none)" is for internal usage only: when doer tries to search non-existing user, use "(none)" to return empty result.
+		return "(none)"
 	}
-	return optional.Some(u.ID)
+	return strconv.FormatInt(u.ID, 10)
 }

routers/web/user/home.go

@@ -501,9 +501,9 @@ func buildIssueOverview(ctx *context.Context, unitType unit.Type) {
 	case issues_model.FilterModeAll:
 	case issues_model.FilterModeYourRepositories:
 	case issues_model.FilterModeAssign:
-		opts.AssigneeID = optional.Some(ctx.Doer.ID)
+		opts.AssigneeID = strconv.FormatInt(ctx.Doer.ID, 10)
 	case issues_model.FilterModeCreate:
-		opts.PosterID = optional.Some(ctx.Doer.ID)
+		opts.PosterID = strconv.FormatInt(ctx.Doer.ID, 10)
 	case issues_model.FilterModeMention:
 		opts.MentionedID = ctx.Doer.ID
 	case issues_model.FilterModeReviewRequested:
@@ -792,9 +792,9 @@ func getUserIssueStats(ctx *context.Context, ctxUser *user_model.User, filterMod
 		case issues_model.FilterModeYourRepositories:
 			openClosedOpts.AllPublic = false
 		case issues_model.FilterModeAssign:
-			openClosedOpts.AssigneeID = optional.Some(doerID)
+			openClosedOpts.AssigneeID = strconv.FormatInt(doerID, 10)
 		case issues_model.FilterModeCreate:
-			openClosedOpts.PosterID = optional.Some(doerID)
+			openClosedOpts.PosterID = strconv.FormatInt(doerID, 10)
 		case issues_model.FilterModeMention:
 			openClosedOpts.MentionID = optional.Some(doerID)
 		case issues_model.FilterModeReviewRequested:
@@ -816,8 +816,8 @@ func getUserIssueStats(ctx *context.Context, ctxUser *user_model.User, filterMod
 
 	// Below stats are for the left sidebar
 	opts = opts.Copy(func(o *issue_indexer.SearchOptions) {
-		o.AssigneeID = nil
-		o.PosterID = nil
+		o.AssigneeID = ""
+		o.PosterID = ""
 		o.MentionID = nil
 		o.ReviewRequestedID = nil
 		o.ReviewedID = nil
@@ -827,11 +827,11 @@ func getUserIssueStats(ctx *context.Context, ctxUser *user_model.User, filterMod
 	if err != nil {
 		return nil, err
 	}
-	ret.AssignCount, err = issue_indexer.CountIssues(ctx, opts.Copy(func(o *issue_indexer.SearchOptions) { o.AssigneeID = optional.Some(doerID) }))
+	ret.AssignCount, err = issue_indexer.CountIssues(ctx, opts.Copy(func(o *issue_indexer.SearchOptions) { o.AssigneeID = strconv.FormatInt(doerID, 10) }))
 	if err != nil {
 		return nil, err
 	}
-	ret.CreateCount, err = issue_indexer.CountIssues(ctx, opts.Copy(func(o *issue_indexer.SearchOptions) { o.PosterID = optional.Some(doerID) }))
+	ret.CreateCount, err = issue_indexer.CountIssues(ctx, opts.Copy(func(o *issue_indexer.SearchOptions) { o.PosterID = strconv.FormatInt(doerID, 10) }))
 	if err != nil {
 		return nil, err
 	}