![](/img/trans.png)
[英]Retrieving a model and updating its (polymorphic) related models in Laravel 7
[英]Retrieving related models in Laravel
我想从数据库中列出所有活动及其关系。 这是现在的代码。
Campaign.php
public function task(){
return $this->hasMany('Task','campaign_id');
}
}
?>
Task.php
public function campaign(){
return $this->belongsTo('Campaign','campaign_id');
}
}
?>
和页面控制器
public function campaigns(){
return View::make('pages.platform.campaigns')
->with('campaigns', Campaign::all());
}
在这种情况下,我这样做:
<pre>
@foreach($campaigns as $c)
<? print_r($c) ?>
@endforeach
</pre>
我看不到关系
[relations:protected] => Array()
我如何访问此相关模型,以便可以像它们一样回显它们
$c['name'] // Name field in Campaign table
$c['task']['name'] // Name field in related Task table
就这么简单:
foreach ($campaigns as $campaign)
{
$campaign->name; // campaign model property
foreach ($campaign->task as $task) // $campaign->task is a collection (hasMany relation)
{
$task; // related Task model
$task->name; // with accessible all its properties
}
}
但以上内容将导致foreach循环中每个广告系列的数据库查询,因此在您的控制器中进行更改:
->with('campaigns', Campaign::all());
// to this:
->with('campaigns', Campaign::with('task')->get());
with()方法负责快速加载-请务必检查。 http://laravel.com/docs/eloquent#eager-loading
然后,我建议对关系本身适当地调用您的关系,所以对belongsTo或hasOne来说是单数,对hasMany,belongsToMany,hasManyThrough等来说是复数。
话虽这么说,我会这样称呼你的关系:
// Campaign model
public function tasks()
{
...
}
然后,当然可以在with()方法中引用“任务”,而不是“任务”。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.