<?php
    
    use yii\db\Migration;
    
    class m170607_102520_social_customer_modification extends Migration
    {
        public function safeUp()
        {
            $this->alterColumn('customer', 'email', 'DROP NOT NULL');
        }
        
        public function safeDown()
        {
            $this->alterColumn('customer', 'email', 'SET NOT NULL');
        }
    }