Question

我正在查询activedataprovider，我将其用于搜索目的。我需要使用交叉连接。我使用joinWith，但它抱怨仓库模型与产品无关。它叫产品。这里是否有任何工作，以便它不会触发关系，因为它是一个交叉连接？

其他说明：某些属性，如product_id，product.category等，并不存在于基于仓库的原始模型上。如果我只是添加公共属性/属性变量，或者我是否需要解决这个问题，它是否可以正常工作？

public function search($params)
    {               
        $query = Warehouse::find()->joinWith('product')
                ->select(['product_id' => 'product.id','warehouse.warehouse', 'product.category', 'product.product', 'min_stock' => 'coalesce(critical.min_stock, -1)'])
                ->leftJoin('critical', 'critical.product_id = product.id AND critical.warehouse_id = warehouse.id')
                ->where(['warehouse.id' => $this->_id]);

        $this->load($params);

        $dataProvider = new ActiveDataProvider([
            'query' => $query,
        ]);        

        if (!$this->validate()) {
            // uncomment the following line if you do not want to return any records when validation fails
            // $query->where('0=1');
            return $dataProvider;
        }

        $query->andFilterWhere(['category' => $this->category]);
        $query->andFilterWhere(['like', 'product', $this->product]);        

        return $dataProvider;
    }

Answer 1

对于使用yii2 activeRecord或activeQuery functionalites构建困难（或不可能）的所有查询，您可以使用findBySql

$sql = "select 
          product.id as id
          , warehouse.warehouse as warehouse 
          , product.category as category
          , product.product as product
          , coalesce(critical.min_stock, -1) as min_stock 
          from Warehouse 
          cross join product  
          left join critical on ritical.product_id = product.id AND critical.warehouse_id = warehouse.id
          where warehouse.id' = " . $this->_id  

 $model =  Warehouse::findBySql($sql );

Answer 2

将您的查询记录作为数组获取，这样您就不需要定义关系

public function search($params)
    {               
        $query = Warehouse::find()->joinWith('product')
                ->select(['product_id' => 'product.id','warehouse.warehouse', 'product.category', 'product.product', 'min_stock' => 'coalesce(critical.min_stock, -1)'])
                ->leftJoin('critical', 'critical.product_id = product.id AND critical.warehouse_id = warehouse.id')
                ->where(['warehouse.id' => $this->_id]);

        $query = Warehouse::find()
                ->select('product.id as id,warehouse.warehouse as warehouse, product.category as category, product.product as product, coalesce(critical.min_stock, -1) as min_stock ')
                ->leftJoin('product', 'warehouse.product_id = product.id')
                ->leftJoin('critical', 'critical.product_id = product.id')
                ->where(['warehouse.id' => $this->_id]);
                ->andWhere('critical.warehouse_id = warehouse.id')
                ->asArray();

        $this->load($params);

        $dataProvider = new ActiveDataProvider([
            'query' => $query,
        ]);        

        if (!$this->validate()) {
            // uncomment the following line if you do not want to return any records when validation fails
            // $query->where('0=1');
            return $dataProvider;
        }

        $query->andFilterWhere(['category' => $this->category]);
        $query->andFilterWhere(['like', 'product', $this->product]);        

        return $dataProvider;
    }

现在你将获得记录，因为数组不是对象。

第二种方法是，使用hasOne()或hasMany()

在模型中定义仓库与产品之间的关系

Answer 3

-> joinWith（'product'，true，'交叉连接'）

    mailVC.delegate = self

有没有一种正确的方法来使用yii2进行交叉连接？

3 个答案: