hasOne('Customer', ['id' => 'customer_id']); } public function getOrderItems() { return $this->hasMany('OrderItem', ['order_id' => 'id']); } public function getItems() { return $this->hasMany('Item', ['id' => 'item_id']) ->via('orderItems', function ($q) { // additional query configuration })->orderBy('id'); } public function getBooks() { return $this->hasMany('Item', ['id' => 'item_id']) ->viaTable('tbl_order_item', ['order_id' => 'id']) ->where(['category_id' => 1]); } public function beforeSave($insert) { if (parent::beforeSave($insert)) { $this->create_time = time(); return true; } else { return false; } } }