/**
  * @return \yii\db\ActiveQuery
  */
 public function getCarts()
 {
     return $this->hasMany(Cart::className(), ['item_id' => 'item_id']);
 }
 /**
  * @return \yii\db\ActiveQuery
  */
 public function getCarts()
 {
     return $this->hasMany(Cart::className(), ['customer_user_name' => 'customer_user_name']);
 }