Renamed UserRoles to UserRole Joins, Needed ID column in user_role_joins table

db/migrate/20130423231937_alter_user_roles.rb

@@ -3,7 +3,6 @@ class AlterUserRoles < ActiveRecord::Migration
     rename_table :user_roles, :user_role_joins
     change_table :user_role_joins do |t|
       t.rename :role, :role_id
-      t.remove :id
     end
   end
 end

db/schema.rb

@@ -154,7 +154,7 @@ ActiveRecord::Schema.define(:version => 20130424005701) do
     t.datetime "updated_at",  :null => false
   end
 
-  create_table "user_role_joins", :id => false, :force => true do |t|
+  create_table "user_role_joins", :force => true do |t|
     t.string   "role_id"
     t.datetime "created_at", :null => false
     t.datetime "updated_at", :null => false