overriding associations problem

class User < ActiveRecord::Base belongs_to :creator, :class_name => 'Admin', :foreign_key => :creator_id end

class CreateUsers < ActiveRecord::Migration   def self.up     create_table :users do |t|       t.column :name, :string       t.column :creator_id, :string       t.timestamps     end   end

  def self.down     drop_table :users   end end

I override the naming associations by using the :class_name option in the belongs_to method. I am expecting that it is assocaited by the :creato_id in this case. However the error message shows that it is still looking for users.admin_id instead of users.creator_id though I specify the :foreign_key. How could that be?