adding :singular option to support has_one associations in load/authorize resource - closes #93

spec/cancan/controller_resource_spec.rb

@@ -166,6 +166,26 @@ describe CanCan::ControllerResource do
     @controller.instance_variable_get(:@ability).should == :some_ability
   end
 
+  it "should find record through has_one association with :singular option" do
+    @params.merge!(:action => "show")
+    person = Object.new
+    @controller.instance_variable_set(:@person, person)
+    stub(person).ability { :some_ability }
+    resource = CanCan::ControllerResource.new(@controller, :through => :person, :singular => true)
+    resource.load_resource
+    @controller.instance_variable_get(:@ability).should == :some_ability
+  end
+
+  it "should build record through has_one association with :singular option" do
+    @params.merge!(:action => "create", :ability => :ability_attributes)
+    person = Object.new
+    @controller.instance_variable_set(:@person, person)
+    stub(person).build_ability(:ability_attributes) { :new_ability }
+    resource = CanCan::ControllerResource.new(@controller, :through => :person, :singular => true)
+    resource.load_resource
+    @controller.instance_variable_get(:@ability).should == :new_ability
+  end
+
   it "should only authorize :read action on parent resource" do
     @params.merge!(:action => "new", :person_id => 123)
     stub(Person).find(123) { :some_person }