Return 422 when API playlists cannot be saved

app/controllers/api/playlists_controller.rb

@@ -11,8 +11,11 @@ module API
 
     def create
       @playlist = current_user.playlists.build playlist_params
-      @playlist.save
-      render :show, status: :created
+      if @playlist.save
+        render :show, status: :created
+      else
+        render json: :nothing, status: :unprocessable_entity
+      end
     end
 
     def update

spec/integration/api/playlists_spec.rb

@@ -40,6 +40,14 @@ describe 'API playlists' do
         }
       )
     end
+
+    context 'when playlist is invalid' do
+      let(:playlist) { attributes_for :playlist, name: '' }
+
+      it 'responds with unprocessable entity status' do
+        expect(response).to have_http_status 422
+      end
+    end
   end
 
   it 'updates a playlist' do