<?php
    
    use yii\db\Migration;
    
    /**
     * Handles the creation of table `wishlist`.
     */
    class m170512_092259_create_wishlist_table extends Migration
    {
        /**
         * @inheritdoc
         */
        public function up()
        {
            $this->createTable(
                'wishlist',
                [
                    'user_id'    => $this->integer(),
                    'product_id' => $this->integer(),
                    'variant_id' => $this->integer(),
                ]
            );
            
            $this->addForeignKey('user_fk', 'wishlist', 'user_id', 'customer', 'id', 'CASCADE', 'CASCADE');
            $this->addForeignKey('product_fk', 'wishlist', 'product_id', 'product', 'id', 'CASCADE', 'CASCADE');
            $this->addForeignKey('variant_fk', 'wishlist', 'variant_id', 'variant', 'id', 'CASCADE', 'CASCADE');
            
            $this->createIndex(
                'user_variant_fk',
                'wishlist',
                [
                    'user_id',
                    'variant_id',
                ],
                true
            );
        }
        
        /**
         * @inheritdoc
         */
        public function down()
        {
            $this->dropIndex(
                'user_variant_fk',
                'wishlist'
            );
            
            $this->dropForeignKey('variant_fk', 'wishlist');
            $this->dropForeignKey('product_fk', 'wishlist');
            $this->dropForeignKey('user_fk', 'wishlist');
            
            $this->dropTable('wishlist');
        }
    }