fix(api): filter list-column-issues by project_board_id

ListProjectColumnIssues was returning every issue in the project regardless
of which column was requested. The handler set ProjectIDs but had no way to
constrain to a specific column, and applyProjectCondition only joined
project_issue on project_id.

Add IssuesOptions.ProjectColumnID and extend the single-project branch of
applyProjectCondition to include project_board_id in the JOIN when set.

Strengthen the integration test: previously it placed two issues in the
project (default column) and asserted a column listing returned 2, which
masked the bug. Now create two distinct columns, move one issue into each,
and verify each column's listing returns exactly the issue it owns.

Reported during e2e validation on git.oleks.space against the production
fork (1.26.0-unstable-2026-05-11). Worth back-porting to upstream PR #37518.

models/issues/issue_search.go

@@ -42,6 +42,7 @@ type IssuesOptions struct { //nolint:revive // export stutter
 	SubscriberID       int64
 	MilestoneIDs       []int64
 	ProjectIDs         []int64
+	ProjectColumnID    int64
 	IsClosed           optional.Option[bool]
 	IsPull             optional.Option[bool]
 	LabelIDs           []int64
@@ -206,7 +207,13 @@ func applyProjectCondition(sess *xorm.Session, opts *IssuesOptions) {
 	if len(projectIDs) == 1 && projectIDs[0] == db.NoConditionID { // show those that are in no project
 		sess.And(builder.NotIn("issue.id", builder.Select("issue_id").From("project_issue")))
 	} else if len(projectIDs) == 1 && projectIDs[0] > 0 { // single specific project
-		sess.Join("INNER", "project_issue", "issue.id = project_issue.issue_id AND project_issue.project_id = ?", projectIDs[0])
+		if opts.ProjectColumnID > 0 {
+			sess.Join("INNER", "project_issue",
+				"issue.id = project_issue.issue_id AND project_issue.project_id = ? AND project_issue.project_board_id = ?",
+				projectIDs[0], opts.ProjectColumnID)
+		} else {
+			sess.Join("INNER", "project_issue", "issue.id = project_issue.issue_id AND project_issue.project_id = ?", projectIDs[0])
+		}
 	} else if len(projectIDs) > 1 { // multiple projects
 		// FIXME: ISSUE-MULTIPLE-PROJECTS-FILTER: this logic is not right, it should use "AND" but not "OR"
 		sess.And(builder.In("issue.id", builder.Select("issue_id").From("project_issue").Where(builder.In("project_id", projectIDs))))

routers/api/v1/repo/project.go

@@ -694,10 +694,11 @@ func ListProjectColumnIssues(ctx *context.APIContext) {
 
 	listOptions := utils.GetListOptions(ctx)
 	issuesOpts := &issues_model.IssuesOptions{
-		Paginator:  &listOptions,
-		RepoIDs:    []int64{ctx.Repo.Repository.ID},
-		ProjectIDs: []int64{column.ProjectID},
-		SortType:   issues_model.SortTypeProjectColumnSorting,
+		Paginator:       &listOptions,
+		RepoIDs:         []int64{ctx.Repo.Repository.ID},
+		ProjectIDs:      []int64{column.ProjectID},
+		ProjectColumnID: column.ID,
+		SortType:        issues_model.SortTypeProjectColumnSorting,
 	}
 
 	count, err := issues_model.CountIssues(ctx, issuesOpts)

tests/integration/api_repo_project_test.go

@@ -15,6 +15,7 @@ import (
 	"code.gitea.io/gitea/models/unittest"
 	user_model "code.gitea.io/gitea/models/user"
 	api "code.gitea.io/gitea/modules/structs"
+	projects_service "code.gitea.io/gitea/services/projects"
 	"code.gitea.io/gitea/tests"
 
 	"github.com/stretchr/testify/assert"
@@ -542,8 +543,8 @@ func testAPIAddIssueToProjectColumn(t *testing.T) {
 func testAPIListProjectColumnIssues(t *testing.T) {
 	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
 	owner := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: repo.OwnerID})
-	issue := unittest.AssertExistsAndLoadBean(t, &issues_model.Issue{ID: 1})
-	pull := unittest.AssertExistsAndLoadBean(t, &issues_model.Issue{ID: 2})
+	issueA := unittest.AssertExistsAndLoadBean(t, &issues_model.Issue{ID: 1})
+	issueB := unittest.AssertExistsAndLoadBean(t, &issues_model.Issue{ID: 2})
 
 	project := &project_model.Project{
 		Title:        "Project for Column Issues",
@@ -555,35 +556,52 @@ func testAPIListProjectColumnIssues(t *testing.T) {
 	err := project_model.NewProject(t.Context(), project)
 	assert.NoError(t, err)
 
-	column := &project_model.Column{
-		Title:     "Column for Issues",
+	columnA := &project_model.Column{
+		Title:     "Column A",
 		ProjectID: project.ID,
 		CreatorID: owner.ID,
 	}
-	err = project_model.NewColumn(t.Context(), column)
+	err = project_model.NewColumn(t.Context(), columnA)
 	assert.NoError(t, err)
 
-	err = issues_model.IssueAssignOrRemoveProject(t.Context(), issue, owner, []int64{project.ID})
+	columnB := &project_model.Column{
+		Title:     "Column B",
+		ProjectID: project.ID,
+		CreatorID: owner.ID,
+	}
+	err = project_model.NewColumn(t.Context(), columnB)
 	assert.NoError(t, err)
-	err = issues_model.IssueAssignOrRemoveProject(t.Context(), pull, owner, []int64{project.ID})
+
+	// Place issueA in columnA, issueB in columnB.
+	err = issues_model.IssueAssignOrRemoveProject(t.Context(), issueA, owner, []int64{project.ID})
+	assert.NoError(t, err)
+	err = projects_service.MoveIssuesOnProjectColumn(t.Context(), owner, columnA, map[int64]int64{0: issueA.ID})
+	assert.NoError(t, err)
+
+	err = issues_model.IssueAssignOrRemoveProject(t.Context(), issueB, owner, []int64{project.ID})
+	assert.NoError(t, err)
+	err = projects_service.MoveIssuesOnProjectColumn(t.Context(), owner, columnB, map[int64]int64{0: issueB.ID})
 	assert.NoError(t, err)
 
 	token := getUserToken(t, owner.Name, auth_model.AccessTokenScopeReadIssue)
 
-	req := NewRequestf(t, "GET", "/api/v1/repos/%s/%s/projects/%d/columns/%d/issues", owner.Name, repo.Name, project.ID, column.ID).
+	// Column A should contain only issueA.
+	req := NewRequestf(t, "GET", "/api/v1/repos/%s/%s/projects/%d/columns/%d/issues", owner.Name, repo.Name, project.ID, columnA.ID).
 		AddTokenAuth(token)
 	resp := MakeRequest(t, req, http.StatusOK)
+	var issuesA []api.Issue
+	DecodeJSON(t, resp, &issuesA)
+	assert.Len(t, issuesA, 1)
+	assert.Equal(t, issueA.ID, issuesA[0].ID)
 
-	var issues []api.Issue
-	DecodeJSON(t, resp, &issues)
-	assert.Len(t, issues, 2)
-
-	issueIDs := make(map[int64]struct{}, len(issues))
-	for _, apiIssue := range issues {
-		issueIDs[apiIssue.ID] = struct{}{}
-	}
-	assert.Contains(t, issueIDs, issue.ID)
-	assert.Contains(t, issueIDs, pull.ID)
+	// Column B should contain only issueB.
+	req = NewRequestf(t, "GET", "/api/v1/repos/%s/%s/projects/%d/columns/%d/issues", owner.Name, repo.Name, project.ID, columnB.ID).
+		AddTokenAuth(token)
+	resp = MakeRequest(t, req, http.StatusOK)
+	var issuesB []api.Issue
+	DecodeJSON(t, resp, &issuesB)
+	assert.Len(t, issuesB, 1)
+	assert.Equal(t, issueB.ID, issuesB[0].ID)
 }
 
 func testAPIRemoveIssueFromProjectColumn(t *testing.T) {