试图获取yii2中非对象的属性 [英] Trying to get property of non-object in yii2

问题描述

我想访问hasMany关系，但是此内容出现错误

I want access to hasMany relation but i get error with this content

PHP公告– yii \ base \ ErrorException

PHP Notice – yii\base\ErrorException

试图获取非对象的属性

这是我的观点:news/index.php

this is my view : news/index.php

<?php foreach($models as $model): ?>
<!-- Project One -->
<div class="row">
    <div class="col-md-2">
        <a href="#">
            <img class="img-responsive" src="photos/<?=$model->photos->id?>.jpg" alt="">
        </a>
    </div>
    <div class="col-md-10">
        <h4>
            <div class="row">
                <div class="col-sm-8">
                    دسته بندی:<?= $model->cat->name; ?>
                </div>
                <div class="col-sm-4">
                    تاریخ:
                </div>
            </div>
        </h4>
        <h3><?=$model->title ?></h3>
        <p><?=$model->body ?></p>
        <a class="btn btn-primary" href="#">View Project <span class="glyphicon glyphicon-chevron-right"></span></a>
    </div>
</div>
        <hr>
<!-- /.row -->
<?php endforeach; ?>

这是我的前端\模型\新闻关系

and this is my frontend\models\News relations

  public function getCat()
{
    return $this->hasOne(Categories::className(), ['id' => 'cat_id']);
}

/**
 * @return \yii\db\ActiveQuery
 */
public function getPhotos()
{
    return $this->hasMany(Photos::className(), ['news_id' => 'id']);
}

/**
 * @return \yii\db\ActiveQuery
 */
public function getViews()
{
    return $this->hasMany(Views::className(), ['news_id' => 'id']);
}

/**
 * @return \yii\db\ActiveQuery
 */
public function getVotes()
{
    return $this->hasMany(Votes::className(), ['news_id' => 'id']);
}

这是NewsController

and this is NewsController

    <?php

namespace frontend\controllers;
use frontend\models\News;

class NewsController extends \yii\web\Controller
{
    public function actionIndex()
    {
        $models =News::find()->all();
        return $this->render('index',compact('models'));
    }

}

这是vardump($model->photos)

         array(1) {
  [0]=>
  object(frontend\models\Photos)#84 (8) {
    ["_attributes":"yii\db\BaseActiveRecord":private]=>
    array(2) {
      ["id"]=>
      int(2)
      ["news_id"]=>
      int(2)
    }
    ["_oldAttributes":"yii\db\BaseActiveRecord":private]=>
    array(2) {
      ["id"]=>
      int(2)
      ["news_id"]=>
      int(2)
    }
    ["_related":"yii\db\BaseActiveRecord":private]=>
    array(0) {
    }
    ["_errors":"yii\base\Model":private]=>
    NULL
    ["_validators":"yii\base\Model":private]=>
    NULL
    ["_scenario":"yii\base\Model":private]=>
    string(7) "default"
    ["_events":"yii\base\Component":private]=>
    array(0) {
    }
    ["_behaviors":"yii\base\Component":private]=>
    array(0) {
    }
  }
}

我可以访问$model->cat->name，但是为什么我不能访问$model->photos->id?

i can access to $model->cat->name but i can't access to $model->photos->id why?!

推荐答案

您遇到的问题是$model->photos是一个数组.这是因为您使用hasMany()设置了关系，这意味着每个News可能具有多个Photos.

The problem you're having is that $model->photos is an array. This is because you set the relationship with hasMany() implying that each News could have multiple Photos.

您可以在视图中执行以下操作:

You can either do the following in your view:

<img class="img-responsive" src="photos/<?=$model->photos[0]->id?>.jpg" alt="">

这将显示第一张照片(假设有一张，如果没有更改，则您必须检查是否已设置0).

This will display the first photo (provided there is one, if there's a change there are none then you would have to check that 0 is set).

或者您可以通过以下方式显示所有照片:

Or you can display all photos with:

foreach($model->photos as $photo)
{ 
   echo '<img class="img-responsive" src="photos/'.$photo->id.'.jpg" alt="">';
}

(或您想要的任何其他设计)

(or any other design you want)

这篇关于试图获取yii2中非对象的属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！