respond with new custom fields after PATCH-ing WP

lib/api/v3/work_packages/work_packages_api.rb

@@ -108,8 +108,11 @@ module API
                                                             send_notifications)
 
               if write_request_valid? && update_service.save
-                @representer.represented.reload
+                work_package = @representer.represented
-                @representer
+                work_package.reload
+                @representer = WorkPackages::WorkPackageRepresenter.create(
+                  work_package,
+                  current_user: current_user)
               else
                 fail ::API::Errors::ErrorBase.create(@representer.represented.errors.dup)
               end

spec/requests/api/v3/work_package_resource_spec.rb

@@ -198,7 +198,6 @@ h4. things we like
     end
   end
 
-  # disabled the its below because the implementation was temporarily disabled
   describe '#patch' do
     let(:patch_path) { "/api/v3/work_packages/#{work_package.id}" }
     let(:valid_params) do
@@ -472,6 +471,71 @@ h4. things we like
         end
       end
 
+      context 'type' do
+        let(:target_type) { FactoryGirl.create(:type) }
+        let(:type_link) { "/api/v3/types/#{target_type.id}" }
+        let(:type_parameter) { { _links: { type: { href: type_link } } } }
+        let(:params) { valid_params.merge(type_parameter) }
+
+        before { allow(User).to receive(:current).and_return current_user }
+
+        context 'valid type' do
+          before do
+            project.types << target_type
+          end
+
+          include_context 'patch request'
+
+          it { expect(response.status).to eq(200) }
+
+          it 'should respond with updated work package type' do
+            expect(subject.body).to be_json_eql(target_type.name.to_json)
+                                      .at_path('_embedded/type/name')
+          end
+
+          it_behaves_like 'lock version updated'
+        end
+
+        context 'valid type changing custom fields' do
+          let(:custom_field) { FactoryGirl.create(:work_package_custom_field) }
+
+          before do
+            project.types << target_type
+            project.work_package_custom_fields << custom_field
+            target_type.custom_fields << custom_field
+          end
+
+          include_context 'patch request'
+
+          it 'responds with the new custom field added' do
+            expect(subject.body).to have_json_path("customField#{custom_field.id}")
+          end
+        end
+
+        context 'invalid type' do
+          include_context 'patch request'
+
+          it_behaves_like 'constraint violation' do
+            let(:message) { "Type #{I18n.t('activerecord.errors.messages.inclusion')}" }
+          end
+        end
+
+        context 'wrong resource' do
+          let(:type_link) { "/api/v3/users/#{current_user.id}" }
+
+          include_context 'patch request'
+
+          it_behaves_like 'constraint violation' do
+            let(:message) {
+              I18n.t('api_v3.errors.invalid_resource',
+                     property: 'type',
+                     expected: '/api/v3/types/:id',
+                     actual: type_link)
+            }
+          end
+        end
+      end
+
       context 'assignee and responsible' do
         let(:user) { FactoryGirl.create(:user, member_in_project: project) }
         let(:params) { valid_params.merge(user_parameter) }