Allow multiple projects per issue and pull requests (#36784)

Add ability to add and remove multiple projects per issue
and pull request.

Resolve #12974

---------

Signed-off-by: Icy Avocado <avocado@ovacoda.com>
Co-authored-by: Tyrone Yeh <siryeh@gmail.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: OpenCode (gpt-5.2-codex) <opencode@openai.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Claude (Opus 4.7) <noreply@anthropic.com>

modules/templates/page.go

@@ -5,6 +5,7 @@ package templates
 
 import (
 	"context"
+	"fmt"
 	"html/template"
 	"io"
 	"net/http"
@@ -36,7 +37,11 @@ func (r *pageRenderer) funcMapDummy() template.FuncMap {
 }
 
 func (r *pageRenderer) TemplateLookup(tmpl string, templateCtx context.Context) (TemplateExecutor, error) { //nolint:revive // we don't use ctx, only pass it to the template executor
-	return r.tmplRenderer.Templates().Executor(tmpl, r.funcMap(templateCtx))
+	tmpls := r.tmplRenderer.Templates()
+	if tmpls == nil {
+		return nil, fmt.Errorf("no templates defined for %s", tmpl)
+	}
+	return tmpls.Executor(tmpl, r.funcMap(templateCtx))
 }
 
 func (r *pageRenderer) HTML(w io.Writer, status int, tplName TplName, data any, templateCtx context.Context) error { //nolint:revive // we don't use ctx, only pass it to the template executor

modules/templates/util_slice.go

@@ -6,6 +6,11 @@ package templates
 import (
 	"fmt"
 	"reflect"
+	"slices"
+	"strconv"
+	"strings"
+
+	"code.gitea.io/gitea/modules/util"
 )
 
 type SliceUtils struct{}
@@ -33,3 +38,29 @@ func (su *SliceUtils) Contains(s, v any) bool {
 	}
 	return false
 }
+
+// JoinInt64 joins a slice of int64 values into a comma-separated string.
+func (su *SliceUtils) JoinInt64(values []int64) string {
+	if len(values) == 0 {
+		return ""
+	}
+	strs := make([]string, len(values))
+	for i, v := range values {
+		strs[i] = strconv.FormatInt(v, 10)
+	}
+	return strings.Join(strs, ",")
+}
+
+func (su *SliceUtils) JoinToggleIDs(values []int64, target int64) (ret struct {
+	IsIncluded bool
+	ToggledIDs string
+},
+) {
+	ret.IsIncluded = slices.Contains(values, target)
+	if ret.IsIncluded {
+		ret.ToggledIDs = su.JoinInt64(util.SliceRemoveAll(slices.Clone(values), target))
+	} else {
+		ret.ToggledIDs = su.JoinInt64(append(values, target))
+	}
+	return ret
+}

modules/templates/util_test.go

@@ -70,6 +70,16 @@ func TestUtils(t *testing.T) {
 	actual = execTmpl("{{StringUtils.Contains .String .Value}}", map[string]any{"String": "abc", "Value": "x"})
 	assert.Equal(t, "false", actual)
 
+	// Test JoinInt64
+	actual = execTmpl("{{SliceUtils.JoinInt64 .Values}}", map[string]any{"Values": []int64{1, 2, 3}})
+	assert.Equal(t, "1,2,3", actual)
+
+	actual = execTmpl("{{SliceUtils.JoinInt64 .Values}}", map[string]any{"Values": []int64{}})
+	assert.Empty(t, actual)
+
+	actual = execTmpl("{{SliceUtils.JoinInt64 .Values}}", map[string]any{"Values": []int64{42}})
+	assert.Equal(t, "42", actual)
+
 	tmpl := template.New("test")
 	tmpl.Funcs(template.FuncMap{"SliceUtils": NewSliceUtils, "StringUtils": NewStringUtils})
 	template.Must(tmpl.Parse("{{SliceUtils.Contains .Slice .Value}}"))