adding :nested option for load_resource - closes #10

spec/cancan/resource_authorization_spec.rb

@@ -78,8 +78,28 @@ describe CanCan::ResourceAuthorization do
   end
   
   it "should not try to load resource for other action if params[:id] is undefined" do
-    authorization = CanCan::ResourceAuthorization.new(@controller, {:controller => "abilities", :action => "list"})
+    authorization = CanCan::ResourceAuthorization.new(@controller, :controller => "abilities", :action => "list")
     authorization.load_resource
     @controller.instance_variable_get(:@ability).should be_nil
   end
+  
+  it "should load nested resource and fetch other resource through the association" do
+    person = Object.new
+    stub(Person).find(456) { person }
+    stub(person).abilities.stub!.find(123) { :some_ability }
+    authorization = CanCan::ResourceAuthorization.new(@controller, {:controller => "abilities", :action => "show", :id => 123, :person_id => 456}, {:nested => :person})
+    authorization.load_resource
+    @controller.instance_variable_get(:@person).should == person
+    @controller.instance_variable_get(:@ability).should == :some_ability
+  end
+  
+  it "should load nested resource and fetch build resource through the association" do
+    person = Object.new
+    stub(Person).find(456) { person }
+    stub(person).abilities.stub!.build({:foo => :bar}) { :some_ability }
+    authorization = CanCan::ResourceAuthorization.new(@controller, {:controller => "abilities", :action => "new", :person_id => 456, :ability => {:foo => :bar}}, {:nested => :person})
+    authorization.load_resource
+    @controller.instance_variable_get(:@person).should == person
+    @controller.instance_variable_get(:@ability).should == :some_ability
+  end
 end

spec/spec_helper.rb

@@ -16,3 +16,7 @@ class Ability
   def initialize(user)
   end
 end
+
+# this class helps out in testing nesting
+class Person
+end