[#42551] API: Add Storages to collection endpoint of projects

https://community.openproject.org/work_packages/42551

- This fixes a failed class check when eager loading projects

lib/api/v3/projects/project_eager_loading_wrapper.rb

@@ -32,6 +32,9 @@ module API
       class ProjectEagerLoadingWrapper < API::V3::Utilities::EagerLoading::EagerLoadingWrapper
         include API::V3::Utilities::EagerLoading::CustomFieldAccessor
 
+        # delegate class check to wrapped object, as there are cases where the type is checked explicitly.
+        delegate :is_a?, to: :__getobj__
+
         class << self
           def wrap(projects)
             custom_fields = projects.first.available_custom_fields if projects.present?

spec/requests/api/v3/projects/index_resource_spec.rb

@@ -266,4 +266,17 @@ describe 'API v3 Project resource index', type: :request, content_type: :json do
         .to be_json_eql(expected.to_json)
     end
   end
+
+  context 'as project collection' do
+    let(:role) { create(:role, permissions: %i[view_work_packages]) }
+    let(:projects) { [project] }
+    let(:expected) do
+      "#{api_v3_paths.project(project.id)}/work_packages"
+    end
+
+    it 'has projects with links to their work packages' do
+      expect(last_response.body)
+        .to be_json_eql(expected.to_json).at_path('_embedded/elements/0/_links/workPackages/href')
+    end
+  end
 end