Name the tags on the topology screens based on its classifications

https://bugzilla.redhat.com/show_bug.cgi?id=1467805

app/services/topology_service.rb

@@ -24,9 +24,18 @@ def entity_id(entity)
     entity_type(entity) + entity.compressed_id.to_s
   end
 
+  def entity_name(entity)
+    if entity.kind_of?(Tag)
+      cls = entity.classification
+      [cls.parent, cls].map(&:description).join(': ')
+    else
+      entity.name
+    end
+  end
+
   def build_base_entity_data(entity)
     {
-      :name   => entity.name,
+      :name   => entity_name(entity),
       :kind   => entity_type(entity),
       :model  => entity.class.to_s,
       :miq_id => entity.id,

spec/services/topology_service_spec.rb

@@ -128,4 +128,26 @@
       end
     end
   end
+
+  describe '#entity_name' do
+    let(:name) { subject.send(:entity_name, entity) }
+
+    context 'entity is not a tag' do
+      let(:entity) { FactoryGirl.create(:vm_vmware) }
+
+      it 'returns with the name of the entity' do
+        expect(name).to eq(entity.name)
+      end
+    end
+
+    context 'entity is a tag' do
+      let(:parent_cls) { FactoryGirl.create(:classification, :description => 'foo') }
+      let(:cls) { FactoryGirl.create(:classification, :parent => parent_cls, :description => 'bar') }
+      let(:entity) { FactoryGirl.create(:tag, :classification => cls) }
+
+      it 'returns with the parent and the child classification description' do
+        expect(name).to eq('foo: bar')
+      end
+    end
+  end
 end