Cancan authentication with Rails -

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i have complex scenario authentication it, came model structure.

see model structure

can 1 guide how use cancan embed authentication structure.

def initialize (user)     user ||= user.new # guest user         user.roles.each |role|       role.permissions.each |p|         can :read, p.resource.class_name.to_s.classify.constantize |subject|           p.resource.class_name == subject.id , p.can_read         end         can :create, p.resource.class_name.to_s.classify.constantize |subject|           p.resource.class_name == subject.id , p.can_create         end         can :update, p.resource.class_name.to_s.classify.constantize |subject|           p.resource.class_name == subject.id , p.can_update         end         can :destroy, p.resource.class_name.to_s.classify.constantize |subject|           p.resource.class_name == subject.id , p.can_delete         end       end     end end

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