Add an actor to FF check on work item type resolver

Most work item's API checks a project as an actor on
the work_items feature flag. This resolver would only check
the FF globally.

app/graphql/resolvers/work_items/types_resolver.rb

@@ -6,6 +6,8 @@ module Resolvers
       type Types::WorkItems::TypeType.connection_type, null: true
 
       def resolve
+        return unless Feature.enabled?(:work_items, object)
+
         # This will require a finder in the future when groups/projects get their work item types
         # All groups/projects use the default types for now
         ::WorkItems::Type.default.order_by_name_asc

app/graphql/types/group_type.rb

@@ -209,8 +209,9 @@ module Types
 
     field :work_item_types, Types::WorkItems::TypeType.connection_type,
           resolver: Resolvers::WorkItems::TypesResolver,
-          description: 'Work item types available to the group.',
-          feature_flag: :work_items
+          description: 'Work item types available to the group.' \
+                       ' Returns `null` if `work_items` feature flag is disabled.' \
+                       ' This flag is disabled by default, because the feature is experimental and is subject to change without notice.'
 
     def label(title:)
       BatchLoader::GraphQL.for(title).batch(key: group) do |titles, loader, args|

app/graphql/types/project_type.rb

@@ -397,8 +397,9 @@ module Types
 
     field :work_item_types, Types::WorkItems::TypeType.connection_type,
           resolver: Resolvers::WorkItems::TypesResolver,
-          description: 'Work item types available to the project.',
-          feature_flag: :work_items
+          description: 'Work item types available to the project.' \
+                       ' Returns `null` if `work_items` feature flag is disabled.' \
+                       ' This flag is disabled by default, because the feature is experimental and is subject to change without notice.'
 
     def label(title:)
       BatchLoader::GraphQL.for(title).batch(key: project) do |titles, loader, args|

doc/api/graphql/reference/index.md

@@ -11129,7 +11129,7 @@ four standard [pagination arguments](#connection-pagination-arguments):
 | <a id="groupvisibility"></a>`visibility` | [`String`](#string) | Visibility of the namespace. |
 | <a id="groupvulnerabilityscanners"></a>`vulnerabilityScanners` | [`VulnerabilityScannerConnection`](#vulnerabilityscannerconnection) | Vulnerability scanners reported on the project vulnerabilities of the group and its subgroups. (see [Connections](#connections)) |
 | <a id="groupweburl"></a>`webUrl` | [`String!`](#string) | Web URL of the group. |
-| <a id="groupworkitemtypes"></a>`workItemTypes` | [`WorkItemTypeConnection`](#workitemtypeconnection) | Work item types available to the group. Available only when feature flag `work_items` is enabled. This flag is disabled by default, because the feature is experimental and is subject to change without notice. (see [Connections](#connections)) |
+| <a id="groupworkitemtypes"></a>`workItemTypes` | [`WorkItemTypeConnection`](#workitemtypeconnection) | Work item types available to the group. Returns `null` if `work_items` feature flag is disabled. This flag is disabled by default, because the feature is experimental and is subject to change without notice. (see [Connections](#connections)) |
 
 #### Fields with arguments
 
@@ -13730,7 +13730,7 @@ Represents vulnerability finding of a security report on the pipeline.
 | <a id="projectvulnerabilityscanners"></a>`vulnerabilityScanners` | [`VulnerabilityScannerConnection`](#vulnerabilityscannerconnection) | Vulnerability scanners reported on the project vulnerabilities. (see [Connections](#connections)) |
 | <a id="projectweburl"></a>`webUrl` | [`String`](#string) | Web URL of the project. |
 | <a id="projectwikienabled"></a>`wikiEnabled` | [`Boolean`](#boolean) | Indicates if Wikis are enabled for the current user. |
-| <a id="projectworkitemtypes"></a>`workItemTypes` | [`WorkItemTypeConnection`](#workitemtypeconnection) | Work item types available to the project. Available only when feature flag `work_items` is enabled. This flag is disabled by default, because the feature is experimental and is subject to change without notice. (see [Connections](#connections)) |
+| <a id="projectworkitemtypes"></a>`workItemTypes` | [`WorkItemTypeConnection`](#workitemtypeconnection) | Work item types available to the project. Returns `null` if `work_items` feature flag is disabled. This flag is disabled by default, because the feature is experimental and is subject to change without notice. (see [Connections](#connections)) |
 
 #### Fields with arguments
 

spec/graphql/resolvers/work_items/types_resolver_spec.rb

@@ -7,16 +7,41 @@ RSpec.describe Resolvers::WorkItems::TypesResolver do
 
   let_it_be(:current_user) { create(:user) }
   let_it_be(:group)        { create(:group) }
+  let_it_be(:project)      { create(:project, group: group) }
 
   before_all do
     group.add_developer(current_user)
   end
 
-  describe '#resolve' do
-    it 'returns all default work item types' do
-      result = resolve(described_class, obj: group)
+  shared_examples 'a work item type resolver' do
+    subject(:result) { resolve(described_class, obj: object) }
 
+    it 'returns all default work item types' do
       expect(result.to_a).to match(WorkItems::Type.default.order_by_name_asc)
     end
+
+    context 'when work_items feature flag is disabled' do
+      before do
+        stub_feature_flags(work_items: false)
+      end
+
+      it 'returns nil' do
+        expect(result).to be_nil
+      end
+    end
+  end
+
+  describe '#resolve' do
+    context 'when parent is a group' do
+      let(:object) { group }
+
+      it_behaves_like 'a work item type resolver'
+    end
+
+    context 'when parent is a project' do
+      let(:object) { project }
+
+      it_behaves_like 'a work item type resolver'
+    end
   end
 end

spec/requests/api/graphql/group/work_item_types_spec.rb

@@ -64,8 +64,8 @@ RSpec.describe 'getting a list of work item types for a group' do
       post_graphql(query, current_user: current_user)
     end
 
-    it 'makes the workItemTypes field unavailable' do
-      expect(graphql_errors).to contain_exactly(hash_including("message" => "Field 'workItemTypes' doesn't exist on type 'Group'"))
+    it 'returns null' do
+      expect(graphql_data.dig('group', 'workItemTypes')).to be_nil
     end
   end
 end

spec/requests/api/graphql/project/work_item_types_spec.rb

@@ -64,8 +64,8 @@ RSpec.describe 'getting a list of work item types for a project' do
       post_graphql(query, current_user: current_user)
     end
 
-    it 'makes the workItemTypes field unavailable' do
-      expect(graphql_errors).to contain_exactly(hash_including("message" => "Field 'workItemTypes' doesn't exist on type 'Project'"))
+    it 'returns null' do
+      expect(graphql_data.dig('project', 'workItemTypes')).to be_nil
     end
   end
 end