情境要求：

要在订单（Order）视图的gridview中显示出客户（Customer）姓名，并使其具有与其它字段相同的排序和搜索功能。

数据库结构

订单表order含有字段customer_id 与 客户表customer的id字段关联

首先确保在Order Model中包含以下代码：

public function getCustomer(){  return $this->hasOne(Customer::className(), ["id" => "customer_id"]);}

用gii会自动生成此代码；

第一步：

在OrderSearch添加一个$customer_name变量

class OrderSearch extends Order{  public $customer_name; //<=====就是加在这里}

第二步：

修改OrderSearch中的search函数

public function search($params){  $query = Order::find();  $query->joinWith(["customer"]);<=====加入这句  $dataProvider = new ActiveDataProvider([    "query" => $query,  ]);    $dataProvider->setSort([    "attributes" => [      /* 其它字段不要动 */        /* 下面这段是加入的 */      /*=============*/      "customer_name" => [        "asc" => ["customer.customer_name" => SORT_ASC],        "desc" => ["customer.customer_name" => SORT_DESC],        "label" => "Customer Name"      ],      /*=============*/    ]  ]);   if (!($this->load($params) && $this->validate())) {    return $dataProvider;  }  $query->andFilterWhere([    "id" => $this->id,    "user_id" => $this->user_id,    "customer_id" => $this->customer_id,    "order_time" => $this->order_time,    "pay_time" => $this->pay_time,  ]);  $query->andFilterWhere(["like", "status", $this->status]);   $query->andFilterWhere(["like", "customer.customer_name", $this->customer_name]) ;//<=====加入这句    return $dataProvider;}

第三步：

修改order/index视图的gridview

<?= GridView::widget([  "dataProvider" => $dataProvider,  "filterModel" => $searchModel,  "columns" => [    ["class" => "yiigridSerialColumn"],    "id",    "customer_id",     "status",    ["label"=>"客户", "attribute" => "customer_name", "value" => "customer.customer_name" ],//<=====加入这句    ["class" => "yiigridActionColumn"],  ],]); ?>

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