order of rules when using includes

[Brad Langhorst]

Take the example of an admin user vs. a guest user.

for the guest i have the rule:

    has_permission_on :conditions, :to => [:new, :create,:update,:read,:show,:index] do

      if_permitted_to :read, :experimental_conditions

    end

    has_permission_on :experimental_conditions, :to => [:new, :create,:update,:read, :show, :index] do

      if_attribute :well_id => is { nil }

    end

but for the admin user i have the rule 

    has_permission_on :conditions, :to => [:new, :create,:update,:read,:show,:index]

(much less expensive)

the admin user also 

 includes [:guest]

so when i say

Conditions.with_permissions_to(:read) i always get the expensive left outer join performed. 

I have tried to change the position of the the includes hoping that the cheap rules will be evaluated first, but it does not seem to be the case.

What's the best way to handle this?

Brad