循环关系 Laravel
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Loop through relationships Laravel
提问by Ricki Moore
Stackoverflow,
堆栈溢出，
What I want to accomplish:
我想要完成的事情：
I want to Loop through the database to find all the (Heroes) with their related (Interview). I want to also pull each Interview with it's related (Story) and (Image). So far I can dd($heroes) and I can see the array correctly grab each hero with their interview and each interview has it's associated image and story. How do I loop through this correctly?
我想遍历数据库以找到所有（英雄）及其相关（采访）。我还想把每次采访都与它相关的（故事）和（图像）拉出来。到目前为止，我可以 dd($heroes) 并且我可以看到数组在他们的采访中正确地抓住了每个英雄，并且每次采访都有相关的图像和故事。我如何正确循环这个？
Error
错误
Invalid argument supplied for foreach() (View: /Users/plastics1509moore/Desktop/elephant_gin/resources/views/administration/index.blade.php)
This is what I have done:
这就是我所做的：
Controller:
控制器：
$heroes = Hero::with('Interview', 'Interview.stories', 'Interview.images')->orderBy('position', 'asc')->get();
Model Relationships:
模型关系：
Hero:
英雄：
public function Interview()
{
return $this->hasOne('App\Interview', 'heroInt_id');
}
Interview:
面试：
public function relationships()
{
return $this->belongsTo('App\Hero');
}
public function stories()
{
return $this->hasMany('App\InterviewStory');
}
public function images()
{
return $this->hasMany('App\InterviewImage');
}
InterviewImage:
采访图片：
public function relationships()
{
return $this->belongsTo('App\Interview');
}
InterviewStory
采访故事
public function relationships()
{
return $this->belongsTo('App\Interview');
}
Html:
网址：
Loop:
环形：
@foreach($heroes as $hero)
@foreach($hero->Interview as $story)
<div>{{$story->id}}</div>
@endforeach
@endforeach
回答by PeterPan666
You can't loop on Interview because this a hasOnerelationship. What you might want to do is
你不能循环采访，因为这是一种hasOne关系。你可能想要做的是
@foreach($heroes as $hero)
@foreach($hero->interview->stories as $story)
<div>{{$story->id}}</div>
@endforeach
@endforeach
回答by Santiago Mendoza Ramirez
I think your problem is because not following laravel "assumes". In documentation:
我认为你的问题是因为没有遵循laravel“假设”。在文档中：
Additionally, Eloquent assumes that the foreign key should have a value matching the id column of the parent. In other words, Eloquent will look for the value of the user's id column in the user_id column of the Phone record. If you would like the relationship to use a value other than id, you may pass a third argument to the hasOne method specifying your custom key:
return $this->hasOne('App\Phone', 'foreign_key', 'local_key');
此外，Eloquent 假设外键的值应该与父键的 id 列匹配。换句话说，Eloquent 将在 Phone 记录的 user_id 列中查找用户 id 列的值。如果您希望关系使用 id 以外的值，您可以将第三个参数传递给 hasOne 方法，指定您的自定义键：
return $this->hasOne('App\Phone', 'foreign_key', 'local_key');
What is the id of Hero? If it's different than id, then you have to add the local_keyname.
英雄的id是什么？如果它不同于id，那么您必须添加local_key名称。
