Cancan gem help as I Can..not ;-)

I’ll be grateful to any cancan guru to give me some advice on how to
formulate the abilities in a structure with associations …

I have the following tree association :

Subdomain (has_one) > Portfolio (has_many) > Projects (has_many) >
Payments
Subdomain (has_many) > Users (w roles)

I want a ‘user’ with role ‘owner’ to be able to manage all model
instances in the hierarchy ONLY within his subdomain

I wrote ( need to understand if it’s fine … or if there is a better
way… I know CanCan 2.0 is coming but…)

class Ability
include CanCan::Ability
def initialize(user)
user ||= User.new

  subdomain = user.subdomain
  can :manage, Portfolio, :subdomain_id => subdomain[:id]
  can :create, Project
  can :modify, Project, :portfolio => {:subdomain_id =>

subdomain[:id]}
can :create, Payment
can :modify, Payment, :project => {:portfolio => {:subdomain_id
=> subdomain[:id]} }

Why is it not possible to check the subdomain on ‘create’ when
resources are not nested ? I tried
can :create, Project, :portfolio => {:subdomain_id => subdomain[:id]}
but then it raises a CanCan::AccessDenied error on form submit…

thanks for your feedback

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