hasOne(Customer::className(), ['id' => 'customer_id']); } public function getOrderItems() { return $this->hasMany(OrderItem::className(), ['order_id' => 'id']); } public function getItems() { return $this->hasMany(Item::className(), ['id' => 'item_id']) ->via('orderItems', function($q) { // additional query configuration }); } public function getBooks() { return $this->hasMany(Item::className(), ['id' => 'item_id']) ->via('orderItems', ['order_id' => 'id']); //->where(['category_id' => 1]); } public function beforeSave($insert) { if (parent::beforeSave($insert)) { $this->create_time = time(); return true; } else { return false; } } public static function getRecordSchema() { return new RecordSchema(array( 'name' => 'orders', 'primaryKey' => ['id'], 'columns' => array( 'id' => 'integer', 'customer_id' => 'integer', 'create_time' => 'integer', 'total' => 'decimal', ) )); } }