php - CListView Action 索引的 Yii 关系表

Question

在我的 web 应用程序 View 中，我需要显示来自两个不同相关表的列，用于索引操作但是我收到了这个错误，我无法弄清楚，我应该如何解决任何问题请帮忙

Trying to get property of non-object

在这一行

<?php echo CHtml::encode($data->producerOfferUserRelation->name); ?>
     <br />

我的模型代码

public function relations()
    {
        return array(
                'producerOfferVegetableRelation' => array(self::BELONGS_TO, 'Vegetable', 'vegetable_id'),
                'producerOfferUserRelation' => array(self::BELONGS_TO, 'User', 'user_id'),
                'producerOfferVegetableViaCodeRelation' => array(self::BELONGS_TO, 'Vegetable', 'code'),
        );
    }


    public function attributeLabels()
    {
        return array(
            'producerOfferUserRelation.name' => 'Offered By',
            'producerOfferVegetableRelation.name' => 'Offered Vegetable',
            'offered_qty' => 'Offered Qty(/KG)',
            'unit_cost' => 'Unit Cost(RS/KG)',
            'unit_delivery_cost' => 'Unit Delivery Cost(RS/KM)',
            'offered_date' => 'Offered Date',
            'booking_status' => 'Booking Status',
            'booked_by' => 'Booked By',
            'available_days' => 'Available Days',
        );
    }

我在 Controller 中的索引操作

public function actionIndex()
{

    $dataProvider=new CActiveDataProvider('ProducerOffer');

    $this->render('index',array(
            'dataProvider'=>$dataProvider,
    ));
}

我的 index.php 和 _view.php 代码

<div class="container">

    <legend>
        <h2>Producer offer/h2>
    </legend>
    <div>
        <?php $this->widget('bootstrap.widgets.TbListView',array(
                'dataProvider'=>$dataProvider,
                'itemView'=>'_view',
)); ?>
    </div>
</div>

我的 _view.php 代码

<?php

?>

<div class="view">



    <b><?php echo CHtml::encode($data->getAttributeLabel('producerOfferUserRelation.name')); ?>:</b>

    <?php echo CHtml::encode($data->producerOfferUserRelation->name); ?>
    <br />

    <b><?php echo CHtml::encode($data->getAttributeLabel('producerOfferVegetableRelation.name')); ?>:</b>
    <?php echo CHtml::encode($data->producerOfferVegetableRelation->name); ?>
    <br />

    <b><?php echo CHtml::encode($data->getAttributeLabel('unit_cost')); ?>:</b>
    <?php echo CHtml::encode($data->unit_cost); ?>
    <br />

    <b><?php echo CHtml::encode($data->getAttributeLabel('unit_delivery_cost')); ?>:</b>
    <?php echo CHtml::encode($data->unit_delivery_cost); ?>
    <br />



</div>

Answer 1

这是因为您试图通过关系访问的数据不存在。

$data->producerOfferUserRelation

这行返回null，因为producerOdderUser表中不存在对应的数据。所以当你写

$data->producerOfferUserRelation->name

基本上你正在尝试

$data->null->name

这就是你得到错误的原因

Trying to get property of non-object