also use new link helper in version representer

lib/api/v3/versions/version_representer.rb

@@ -38,16 +38,14 @@ module API
         link :self do
           {
             href: api_v3_paths.version(represented.id),
-            title: "#{represented.name}"
+            title: represented.name
           }
         end
 
-        link :definingProject do
-          {
-            href: api_v3_paths.project(represented.project.id),
-            title: represented.project.name
-          } if represented.project.visible?(current_user)
-        end
+        linked_property :definingProject,
+                        path: :project,
+                        backing_field: :project,
+                        visible_condition: -> (*) { represented.project.visible?(current_user) }
 
         link :availableInProjects do
           {

spec/lib/api/v3/support/links.rb

@@ -48,3 +48,29 @@ shared_examples_for 'action link' do
     it { expect(subject).to have_json_path("_links/#{action}/href") }
   end
 end
+
+shared_examples_for 'has a titled link' do
+  it { is_expected.to be_json_eql(href.to_json).at_path("_links/#{link}/href") }
+  it { is_expected.to be_json_eql(title.to_json).at_path("_links/#{link}/title") }
+end
+
+shared_examples_for 'has an untitled link' do
+  it { is_expected.to be_json_eql(href.to_json).at_path("_links/#{link}/href") }
+  it { is_expected.to_not have_json_path("_links/#{link}/title") }
+end
+
+shared_examples_for 'has an empty link' do
+  it { is_expected.to be_json_eql(nil.to_json).at_path("_links/#{link}/href") }
+
+  it 'has no embedded resource' do
+    is_expected.to_not have_json_path("_embedded/#{link}")
+  end
+end
+
+shared_examples_for 'has no link' do
+  it { is_expected.to_not have_json_path("_links/#{link}") }
+
+  it 'has no embedded resource' do
+    is_expected.to_not have_json_path("_embedded/#{link}")
+  end
+end

spec/lib/api/v3/versions/version_representer_spec.rb

@@ -41,40 +41,47 @@ describe ::API::V3::Versions::VersionRepresenter do
 
     it { should include_json('Version'.to_json).at_path('_type') }
 
-    context 'links' do
+    describe 'links' do
 
       it { should have_json_type(Object).at_path('_links') }
 
-      it 'to self' do
-        path = api_v3_paths.version(version.id)
-
-        expect(subject).to be_json_eql(path.to_json).at_path('_links/self/href')
+      describe 'to self' do
+        it_behaves_like 'has a titled link' do
+          let(:link) { 'self' }
+          let(:href) { api_v3_paths.version(version.id) }
+          let(:title) { version.name }
+        end
       end
 
-      context 'to the defining project' do
-        let(:path) { api_v3_paths.project(version.project.id) }
-
-        it 'exists if the user has the permission to see the project' do
-          allow(version.project).to receive(:visible?).with(user).and_return(true)
-
-          subject = representer.to_json
-
-          expect(subject).to be_json_eql(path.to_json).at_path('_links/definingProject/href')
+      describe 'to the defining project' do
+        context 'if the user has the permission to see the project' do
+          before do
+            allow(version.project).to receive(:visible?).with(user).and_return(true)
+          end
+
+          it_behaves_like 'has a titled link' do
+            let(:link) { 'definingProject' }
+            let(:href) { api_v3_paths.project(version.project.id) }
+            let(:title) { version.project.name }
+          end
         end
 
-        it 'does not exist if the user lacks the permission to see the project' do
-          allow(version.project).to receive(:visible?).with(user).and_return(false)
-
-          subject = representer.to_json
+        context 'if the user lacks the permission to see the project' do
+          before do
+            allow(version.project).to receive(:visible?).with(user).and_return(false)
+          end
 
-          expect(subject).to_not have_json_path('_links/definingProject/href')
+          it_behaves_like 'has no link' do
+            let(:link) { 'definingProject' }
+          end
         end
       end
 
-      it 'to available projects' do
-        path = api_v3_paths.versions_projects(version.id)
-
-        expect(subject).to be_json_eql(path.to_json).at_path('_links/availableInProjects/href')
+      describe 'to available projects' do
+        it_behaves_like 'has an untitled link' do
+          let(:link) { 'availableInProjects' }
+          let(:href) { api_v3_paths.versions_projects(version.id) }
+        end
       end
     end
 

spec/lib/api/v3/work_packages/work_package_representer_spec.rb

@@ -233,19 +233,6 @@ describe ::API::V3::WorkPackages::WorkPackageRepresenter do
     end
 
     describe '_links' do
-      shared_examples_for 'has a titled link' do
-        it { is_expected.to be_json_eql(href.to_json).at_path("_links/#{link}/href") }
-        it { is_expected.to be_json_eql(title.to_json).at_path("_links/#{link}/title") }
-      end
-
-      shared_examples_for 'has an empty link' do
-        it { is_expected.to be_json_eql(nil.to_json).at_path("_links/#{link}/href") }
-
-        it 'has no embedded resource' do
-          is_expected.to_not have_json_path("_embedded/#{link}")
-        end
-      end
-
       it { is_expected.to have_json_type(Object).at_path('_links') }
 
       it 'should link to self' do