Improve spec format

lib/generators/simple_controller/templates/specs/spec.rb.tt

@@ -18,7 +18,7 @@ RSpec.describe '<%= controller_path %>', type: :request, capture_examples: true,
 
   before :each do
 <% if auth.present? -%>
-    @auth = <%= auth %>.register "auth", "password"
+    @<%= resource_singular %> = <%= auth %>.register "auth", "password"
     @auth_token = <%= auth %>.login "auth", "password"
 <% end -%>
     @entity_count = 5
@@ -78,8 +78,9 @@ resource_singular %>_ref
 <% elsif details[:summary].start_with?("show") -%>
         it {
           body = JSON.parse(response.body)
+          <%= resource_singular %> = @<%= resource_plural %>.first
 <% attributes_names.each do |attr| -%>
-          expect(body['<%= attr %>']).to eq <%= resource_singular %>_value[:<%= attr %>]
+          expect(body['<%= attr %>']).to eq <%= resource_singular %>.<%= attr %>
 <% end -%>
         }
 <% end -%>