Read route metadata via readers instead of route.options[]

lib/grape-swagger/endpoint.rb

@@ -123,7 +123,7 @@ def method_object(route, options, path)
       method[:parameters]  = params_object(route, options, path, method[:consumes])
       method[:security]    = security_object(route)
       method[:responses]   = response_object(route, options)
-      method[:tags]        = route.tags || tag_object(route, path)
+      method[:tags]        = route.options.key?(:tags) ? route.tags : tag_object(route, path)
       method[:operationId] = GrapeSwagger::DocMethods::OperationId.build(route, path)
       method[:deprecated] = deprecated_object(route)
       method.delete_if { |_, value| value.nil? }

spec/swagger_v2/endpoint_versioned_path_spec.rb

@@ -53,6 +53,23 @@
       end
     end
 
+    context 'when tags are explicitly set to nil' do
+      let(:item) do
+        Class.new(Grape::API) do
+          version 'v1', using: :path
+
+          resource :item do
+            desc 'Item description', tags: nil
+            get '/'
+          end
+        end
+      end
+
+      it 'omits the tags key instead of falling back to the default tag' do
+        expect(subject.first['/v1/item'][:get]).not_to have_key(:tags)
+      end
+    end
+
     context 'when parameter with a custom type is specified' do
       let(:item) do
         Class.new(Grape::API) do