我有两个模型: 1.类(class)。 2.费用。
一门类(class)只有一次费用。虽然提供输入是完全可以的，但是当我尝试访问费用数据时，它在费用栏中没有显示任何内容。我该如何解决？
类(class)模型:
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Course extends Model
{
protected $table='courses';
protected $fillable = ['name'];
public function fee(){
return $this->belongsTo('App\Fee');
}
}
收费模式:
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Fee extends Model
{
protected $table='fees';
protected $fillable = ['fee','course_id'];
public function course()
{
return $this->hasOne('App\Course');
}
}
Controller :
public function listofCourse(){
$course=\App\Course::all();
return view('listofCourse',compact('course'));
}
查看页面:
<html>
<head>
<title> Course Details </title>
<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<script src="https://code.jquery.com/jquery-1.12.0.min.js"></script>
</head>
<body>
<div class="container">
<h3> Student Details </h3>
<table class="table table-striped table-bordered" id="example">
<thead>
<tr>
<td>Serial No</td>
<td>Course Name</td>
<td>Course Fee</td>
</tr>
</thead>
<tbody>
<?php $i=1; ?>
@foreach($course as $row)
<tr>
<td>{{$i}}</td>
<td>{{$row->name }}</td>
<td> @if($row->course)
{{$row->course->fee}}
@endif</td>
</tr>
<?php $i++; ?>
@endforeach
</tbody>
</table>
</div>
</body>
</html>
最佳答案
看来你把关系写错了……就这样吧。
请记住，Course Has The Fee 意味着 Course 是必须的，所以关系应该从 Course 开始到 Fee.
您的类(class)模型
class Course extends Model
{
protected $table='courses';
protected $fillable = ['name'];
public function fee(){
return $this->hasOne('App\Fee','course_id', 'id');
}
}
您的收费模式
class Fee extends Model
{
protected $table='fees';
protected $fillable = ['fee','course_id'];
public function course()
{
return $this->belongsTO('App\Course', 'course_id', 'id');
}
}
现在你可以通过这样做获得关系。
public function listofCourse(){
$course=\App\Course::with('fee')->get();
// doing this for dumping purpose
echo "<pre>";
print_r($course->toArray()); // you will see the `fee` array
echo "</pre>";
die();
return view('listofCourse',compact('course'));
}
关于php - 拉维尔 5.2 : How to retrieve data from one to one eloquent (hasOne) Relationship，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36637037/