I have a many-to-many relationship like this: A user has_many organizations through affiliations and vice-versa.

I'm using declarative organizations and I only want a user to edit a particular organization if he is affiliated and the affiliationtype attribute of affiliation is a particular value.

So affiliations has 3 columns , user_id, organization_id and affiliationtype_id

I can do:

o = Organization.find(:first)
o.affiliatons[0].user and get the user

now I wish to do this:

has_permission_on [:organizations], :to => :edit do
  if_attribute (...)
end

That if_attribute should see if the current user is the organization.affiliation[?].user and if the organization.affiliation[?].affiliationtype_id = "3"

I hope this is syntax issue ... I really need to get this working.