Expose stage dropdown path and title in stage entity

app/serializers/stage_entity.rb

@@ -3,17 +3,35 @@ class StageEntity < Grape::Entity
 
   expose :name
 
-  expose :status do |stage, options|
-    StatusEntity.represent(
-      stage.detailed_status(request.user),
-      options)
+  expose :title do |stage|
+    "#{stage.name}: #{detailed_status.label}"
   end
 
+  expose :detailed_status, as: :status,
+    with: StatusEntity
+
   expose :path do |stage|
     namespace_project_pipeline_path(
       stage.pipeline.project.namespace,
       stage.pipeline.project,
-      stage.pipeline.id,
+      stage.pipeline,
       anchor: stage.name)
   end
+
+  expose :dropdown_path do |stage|
+    stage_namespace_project_pipeline_path(
+      stage.pipeline.project.namespace,
+      stage.pipeline.project,
+      stage.pipeline,
+      stage: stage.name,
+      format: :json)
+  end
+
+  private
+
+  alias_method :stage, :object
+
+  def detailed_status
+    stage.detailed_status(request.user)
+  end
 end

spec/serializers/stage_entity_spec.rb

@@ -15,6 +15,7 @@ describe StageEntity do
 
   before do
     allow(request).to receive(:user).and_return(user)
+    create(:ci_build, :success, pipeline: pipeline)
   end
 
   describe '#as_json' do
@@ -26,6 +27,7 @@ describe StageEntity do
 
     it 'contains detailed status' do
       expect(subject[:status]).to include :text, :label, :group, :icon
+      expect(subject[:status][:label]).to eq 'passed'
     end
 
     it 'contains valid name' do
@@ -36,5 +38,14 @@ describe StageEntity do
       expect(subject[:path])
         .to include "pipelines/#{pipeline.id}##{stage.name}"
     end
+
+    it 'contains path to the stage dropdown' do
+      expect(subject[:dropdown_path])
+        .to include "pipelines/#{pipeline.id}/stage.json?stage=test"
+    end
+
+    it 'contains stage title' do
+      expect(subject[:title]).to eq 'test: passed'
+    end
   end
 end