gistfile1.txt

# ok 
class List
  named_scope :without_address, lambda { |address_id| { :joins => :address_list_memberships, :conditions => ['address_list_memberships.address_id <> ?', address_id]}}
end

# ugly
class List
  def self.without_address_lookup(address_id) 
    { 
      :joins => :address_list_memberships, 
      :conditions => ['address_list_memberships.address_id <> ?', address_id]}
    }
  end
  named_scope :without_address, :without_address_lookup.to_proc
end

#pretty 

class List 
   named_scope(:without_address, lambda do |address_id|
   { 
      :joins => :address_list_memberships, 
      :conditions => ['address_list_memberships.address_id <> ?', address_id]}
    }
   end)
end