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试图在 yii2 中获取非对象的属性
[英] Trying to get property of non-object in yii2
本文介绍了试图在 yii2 中获取非对象的属性的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想访问 hasMany 关系，但此内容出错
<块引用>
PHP 通知 – yiiaseErrorException
试图获取非对象的属性
这是我的观点:news/index.php
<!-- 项目一--><div class="row"><div class="col-md-2"><a href="#"><img class="img-responsive" src="photos/<?=$model->photos->id?>.jpg" alt=""></a>
<div class="col-md-10"><h4><div class="row"><div class="col-sm-8">دسته بندی:<?= $model->cat->name;?>
<div class="col-sm-4">تاریخ:
<h3><?=$model->title?></h3><p><?=$model->body ?></p><a class="btn btn-primary" href="#">查看项目 <span class="glyphicon glyphicon-chevron-right"></span></a>
<小时><!--/.row --><?php endforeach;?>
这是我的前端模型新闻关系
公共函数 getCat(){返回 $this->hasOne(Categories::className(), ['id' => 'cat_id']);}/*** @return yiidbActiveQuery*/公共函数 getPhotos(){返回 $this->hasMany(Photos::className(), ['news_id' => 'id']);}/*** @return yiidbActiveQuery*/公共函数 getViews(){返回 $this->hasMany(Views::className(), ['news_id' => 'id']);}/*** @return yiidbActiveQuery*/公共函数 getVotes(){返回 $this->hasMany(Votes::className(), ['news_id' => 'id']);}
这是新闻控制器
all();返回 $this->render('index',compact('models'));}}
这是vardump($model->photos)
数组(1) {[0]=>对象(前端模型照片)#84 (8) {["_attributes":"yiidbBaseActiveRecord":private]=>数组(2){[id"]=>整数(2)["news_id"]=>整数(2)}["_oldAttributes":"yiidbBaseActiveRecord":private]=>数组(2){[id"]=>整数(2)["news_id"]=>整数(2)}["_related":"yiidbBaseActiveRecord":private]=>数组(0){}["_errors":"yiiaseModel":private]=>空值["_validators":"yiiaseModel":private]=>空值["_scenario":"yiiaseModel":private]=>字符串(7)默认"["_events":"yiiaseComponent":private]=>数组(0){}["_behaviors":"yiiaseComponent":private]=>数组(0){}}}
我可以访问 $model->cat->name 但我无法访问 $model->photos->id 为什么?！
解决方案
您遇到的问题是 $model->photos 是一个数组.这是因为您设置了与 hasMany() 的关系，这意味着每个 News 可以有多个 Photos.
您可以在视图中执行以下操作:
<img class="img-responsive" src="photos/<?=$model->photos[0]->id?>.jpg" alt="">
这将显示第一张照片(假设有一张，如果有更改则没有，则您必须检查是否设置了 0).
或者您可以显示所有照片:
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)
I want access to hasMany relation but i get error with this content
PHP Notice – yiiaseErrorException
Trying to get property of non-object
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; ?>
and this is my frontendmodelsNews relations
public function getCat()
{
return $this->hasOne(Categories::className(), ['id' => 'cat_id']);
}
/**
* @return yiidbActiveQuery
*/
public function getPhotos()
{
return $this->hasMany(Photos::className(), ['news_id' => 'id']);
}
/**
* @return yiidbActiveQuery
*/
public function getViews()
{
return $this->hasMany(Views::className(), ['news_id' => 'id']);
}
/**
* @return yiidbActiveQuery
*/
public function getVotes()
{
return $this->hasMany(Votes::className(), ['news_id' => 'id']);
}
and this is NewsController
<?php
namespace frontendcontrollers;
use frontendmodelsNews;
class NewsController extends yiiwebController
{
public function actionIndex()
{
$models =News::find()->all();
return $this->render('index',compact('models'));
}
}
and this is vardump($model->photos)
array(1) {
[0]=>
object(frontendmodelsPhotos)#84 (8) {
["_attributes":"yiidbBaseActiveRecord":private]=>
array(2) {
["id"]=>
int(2)
["news_id"]=>
int(2)
}
["_oldAttributes":"yiidbBaseActiveRecord":private]=>
array(2) {
["id"]=>
int(2)
["news_id"]=>
int(2)
}
["_related":"yiidbBaseActiveRecord":private]=>
array(0) {
}
["_errors":"yiiaseModel":private]=>
NULL
["_validators":"yiiaseModel":private]=>
NULL
["_scenario":"yiiaseModel":private]=>
string(7) "default"
["_events":"yiiaseComponent":private]=>
array(0) {
}
["_behaviors":"yiiaseComponent":private]=>
array(0) {
}
}
}
i can access to $model->cat->name but i can't access to $model->photos->id why?!
解决方案
The problem you're having is that $model->photos is an array. This is because you set the relationship with hasMany() implying that each News could have multiple Photos.
You can either do the following in your view:
<img class="img-responsive" src="photos/<?=$model->photos[0]->id?>.jpg" alt="">
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).
Or you can display all photos with:
foreach($model->photos as $photo)
{
echo '<img class="img-responsive" src="photos/'.$photo->id.'.jpg" alt="">';
}
(or any other design you want)
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