Fix swagger generation if a controller's parent doesn't define a resource_description

Author: enrique-guillen

README.rst

@@ -283,6 +283,8 @@ Example:
         property :enum1, ['v1', 'v2'], :desc => "One of 2 possible string values"
       end
    end
+   tags %w[profiles logins]
+   tags 'more', 'related', 'resources'
    description "method description"
    formats ['json', 'jsonp', 'xml']
    meta :message => "Some very important info"

lib/apipie/method_description.rb

@@ -101,7 +101,7 @@ def tag_list
       parent = Apipie.get_resource_description(@resource.controller.superclass)
 
       # get tags from parent resource description
-      parent_tags = [parent, @resource].flat_map { |resource| resource._tag_list_arg }
+      parent_tags = [parent, @resource].compact.flat_map { |resource| resource._tag_list_arg }
       Apipie::TagListDescription.new((parent_tags + @tag_list).uniq.compact)
     end
 

spec/dummy/app/controllers/tagged_cats_controller.rb

@@ -3,7 +3,7 @@
 # defining a set of tags for the contained methods to include.
 #
 
-class TaggedCatsController < ApplicationController
+class TaggedCatsController < ActionController::Base
   resource_description do
     description 'A controller to test "returns"'
     short 'Pets'

spec/dummy/app/controllers/tagged_dogs_controller.rb

@@ -0,0 +1,15 @@
+#
+# The TagsController defined here provides an example of a
+# tags call without a resource description.
+#
+
+class TaggedDogsController < ActionController::Base
+  #-----------------------------------------------------------
+  # simple 'returns' example: a method that returns a cat record
+  #-----------------------------------------------------------
+  api :GET, "/pets/:id/as_properties", "Get a dog record"
+  tags(%w[Dogs Wolves])
+  def show_as_properties
+    render :plain => "showing pet properties"
+  end
+end

spec/lib/swagger/swagger_dsl_spec.rb

@@ -448,6 +448,27 @@ def have_field?(field, expected_name, breadcrumb)
 
   end
 
+  #==============================================================================
+  # TaggedDogsController is a demonstration of how tags may be defined in a simple
+  # controller class without defining either the controller resource-description
+  # block or the controller's superclass's resource-description block.
+  #==============================================================================
+
+  describe TaggedDogsController do
+    describe "TaggedDogsController#show_as_properties" do
+      subject do
+        desc._methods[:show_as_properties]
+      end
+
+      it "should return tags with 'Dogs', and 'Wolves'" do
+        returns_obj = subject.tag_list
+        puts returns_obj.inspect
+
+        expect(returns_obj.tags).to eq(%w[Dogs Wolves])
+      end
+    end
+  end
+
   #==============================================================================
   # TaggedCatsController is a demonstration of how tags may be defined in the
   # controller's resource description so that they may be automatically prefixed