update employee migrate

db/migrate/20170403155230_create_employees.rb

@@ -5,6 +5,7 @@ class CreateEmployees < ActiveRecord::Migration[5.1]
       t.string :role, :null => false, :default => "cashier"
       t.boolean :is_active, :default => true, :index=>true
       t.string :emp_id, :null => false
+      t.integer :order_queue_station_id
       t.string :password_digest, :null => false
       t.string :token_session, :index=>true
       t.datetime :session_expiry