Php Laravel HasMany relationship未定义属性:Illumb\Database\Eloquent\Relations\HasMany::$id
我在读取具有关系的数据时遇到问题。它如何返回未定义的属性:illumb\Database\elounce\Relations\HasMany::$id。我不知道我做错了什么,因为我刚刚开始使用laravel 模型1项目:Php Laravel HasMany relationship未定义属性:Illumb\Database\Eloquent\Relations\HasMany::$id,php,laravel,Php,Laravel,我在读取具有关系的数据时遇到问题。它如何返回未定义的属性:illumb\Database\elounce\Relations\HasMany::$id。我不知道我做错了什么,因为我刚刚开始使用laravel 模型1项目: namespace App; use Illuminate\Database\Eloquent\Model; class Project extends Model { protected $table = "project"; public function p
namespace App;
use Illuminate\Database\Eloquent\Model;
class Project extends Model
{
protected $table = "project";
public function projectitem()
{
return $this->hasMany('App\Projectitem');
}
}
namespace App;
use Illuminate\Database\Eloquent\Model;
class Projectitem extends Model
{
protected $table = "project_item";
function project(){
return $this->belongsTo('App\Project');
}
}
模型2项目项:
namespace App;
use Illuminate\Database\Eloquent\Model;
class Project extends Model
{
protected $table = "project";
public function projectitem()
{
return $this->hasMany('App\Projectitem');
}
}
namespace App;
use Illuminate\Database\Eloquent\Model;
class Projectitem extends Model
{
protected $table = "project_item";
function project(){
return $this->belongsTo('App\Project');
}
}
index.php
@foreach ($projects as $project)
<tr>
<td>{{$project->projectitem()->id}}</td>
<td></td>
</tr>
@endforeach
@foreach($projects作为$project)
{{$project->projectitem()->id}
@endforeach
我不知道为什么会发生这种情况,我尝试过几种解决方案,但似乎都不管用
任何帮助都将不胜感激看看关系-
它有很多关系。也就是说,项目上有很多项目项
试试这个
@foreach ($projects as $project)
@foreach ($project->projectitem as $projectitem)
echo $projectitem->id
@endforeach
@endforeach
注意:只有当关系为hasMany时,才需要此内部循环。如果是hasOne,则无需更改循环中的任何内容,只需将关系更改为hasOne并运行即可 您在
$Projects
中有Projects对象集合。执行循环后,根据循环的状态,每个项目都将成为$project
。调用projectitem
时,它将返回projectitem
的集合,而不是单个projectitem
,这就是$id
未定义的原因。您应该形成另一个循环来分别获取每个项目项
@foreach ($projects as $project)
// $project->projectitem() return a collection of projectitem
// and not a single projectitem
// to access ID of each projectitem you must perform another loop
@foreach ($project->projectitem() as $projectitem)
// here project id is disponible as property accessible like this
{{ $projectitem->id }}
@endforeach
@endforeach
是否要在同一列中显示所有相关的“projectitem”?