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Cancan, Inherited Resources, and Nested Routes

h1. Cancan, Inherited Resources, and Nested Routes p(meta). 07 Oct 2010 - Balitmore, MD h2. Problem: My subscription does not have a subscriber. InheritedResources is not populating the `belongs_to` item.

  SubscriptionsController << InheritedResources::Base
    belongs_to :subscriber
    load_and_authorize_resource

    def create
      @subscription = build_resource
      # do something with subscription
      create!
    end
  end

In `def create`, `@subscription.subscriber` is nil. This *should* be populated by InheritedResources during #build_resource.

  def build_resource
    get_resource_ivar || set_resource_ivar(end_of_association_chain.send(method_for_build, params[resource_instance_name] || {}))
  end

Unfortunately, Cancan's load_resource is populating the @subscription instance var, so build_resource simply returns the value of the instance var (get_resource_var). h2. Solution: Don't ask cancan to load the resource.

  SubscriptionsController << InheritedResources::Base
    belongs_to :subscriber
    authorize_resource

    def create
      @subscription = build_resource
    	# do something with subscription
      create!
    end
  end

Or...

  SubscriptionsController << InheritedResources::Base
    belongs_to :subscriber

    def create
      @subscription = build_resource
      authorize! :create, Subscription
    	# do something with subscription
      create!
    end
  end

Note: this appears to only be an issue if using nested routes.

resources :subscriber do
  resources :subscription

This was identified on Rails 3. May affect Rails 2.

Cancan, Inherited Resources, and Nested Routes

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