Fix Vandal loading issue

Author: Lee Richmond

lib/graphiti/resource/configuration.rb

@@ -104,6 +104,11 @@ def self.inherited(klass)
             klass.attribute :id, :integer_id
           end
           klass.stat total: [:count]
+
+          if defined?(::Rails) && ::Rails.env.development?
+            # Avoid adding dupe resources when re-autoloading
+            Graphiti.resources.reject! { |r| r.name == klass.name }
+          end
           Graphiti.resources << klass
         end
       end

spec/remote_resource_spec.rb

@@ -208,7 +208,7 @@ def request_headers
 
     context "when Rails" do
       before do
-        stub_const("Rails", true)
+        stub_const("Rails", double.as_null_object)
       end
 
       it "forwards Authorization header to the remote endpoint" do

spec/resource_spec.rb

@@ -71,7 +71,7 @@
         before do
           rails = double \
             application: double(config: double(eager_load: eager_load))
-          stub_const("Rails", rails)
+          stub_const("Rails", rails.as_null_object)
         end
 
         context "and eager loading" do

spec/schema_spec.rb

@@ -738,7 +738,7 @@ def self.name
     context "when Rails is defined" do
       let(:rails) do
         app = double(eager_load!: true, config: double.as_null_object)
-        double(application: app)
+        double(application: app).as_null_object
       end
 
       before do