[英]Use a parameter from URL in a controller Laravel 5.8.22
I'm trying to pass anINT
from this URL: myapp.build/courses/anINT
(implemented in the CoursesController
) to $id
in the Lesson_unitsController
function below. 我正在尝试从以下URL传递anINT
: myapp.build/courses/anINT
(在CoursesController
实现)到下面的Lesson_unitsController
函数中的$id
。 I've tried a lot of solutions, but I can't seem to get it right. 我尝试了很多解决方案,但似乎无法正确解决。
The function in the CoursesController which implements the url is: CoursesController中实现url的函数是:
public function show($id)
{
$course = Course::find($id);
return view('courses.show')->with('course', $course);
}
Part of the show.blade.php file is: show.blade.php文件的一部分是:
@if(!Auth::guest())
@if(Auth::user()->id == $course->user_id)
<a href="/courses/{{$course->id}}/edit" class="btn btn-outline-secondary btn-light">Edit Course</a>
<a href="/lesson_units/specificindex" class="btn btn-outline-secondary btn-light">Lesson Units</a>
{!!Form::open(['action'=> ['CoursesController@destroy', $course->id], 'method' => 'POST', 'class' => 'float-right'])!!}
{{Form::hidden('_method', 'DELETE')}}
{{Form::submit('Delete', ['class' => 'btn btn-danger'])}}
{!!Form::close()!!}
@endif
@endif
The Lesson_unitsController
functions are: Lesson_unitsController
函数为:
public function index()
{
$lesson_units = Lesson_unit::orderBy('title','asc')->paginate(10);
return view('lesson_units.index')->with('lesson_units', $lesson_units);
}
public function specificindex($id)
{
$course = Course::find($id);
return view('lesson_units.specificindex')->with('lesson_units', $course->lesson_units);
}
And the specificindex.blade.php
file is: 而且specificindex.blade.php
文件是:
@extends('layouts.app')
@section('content')
<div class="container">
<div class="row justify-content-center">
<div class="col-md-8">
<div class="card">
<div class="card-header">Dashboard</div>
<div class="card-body">
<a href="/lesson_units/create" class="btn btn-primary">Create lesson unit</a>
<p>
<h3>Your lesson_units</h3>
@if(count($lesson_units) > 0)
<table class="table table-striped">
<tr><th>Title</th><th></th><th></th></tr>
@foreach($lesson_units as $lesson_unit)
<tr><td>{{$lesson_unit->title}}</td>
<td><a href="/lesson_units/{{$lesson_unit->id}}/edit" class="btn btn-outline-secondary btn-light">Edit</a></td>
<td>
{!!Form::open(['action'=> ['Lesson_unitsController@destroy', $lesson_unit->id], 'method' => 'POST', 'class' => 'float-right'])!!}
{{Form::hidden('_method', 'DELETE')}}
{{Form::submit('Delete', ['class' => 'btn btn-danger'])}}
{!!Form::close()!!}
</td>
</tr>
@endforeach
</table>
@else
<p>You have no lesson unit.</p>
@endif
@if (session('status'))
<div class="alert alert-success" role="alert">
{{ session('status') }}
</div>
@endif
You are logged in!
</div> </div> </div> </div> </div>
@endsection @endsection
The routes in web.php are: web.php中的路由为:
Route::resource('courses', 'CoursesController');
Route::resource('lesson_units', 'Lesson_unitsController');
Route::get('/courses/{id}', 'Lesson_unitsController@specificIndex');
I want that when the link for Lesson Units
is clicked on the page, the id
in the url is passed to the specificindex
function in the Lesson_unitsController
. 我希望当在页面上单击“ Lesson Units
的链接时,URL中的id
传递给Lesson_unitsController
的specificindex
函数。 Now, I get just a blank page. 现在,我只有空白页。 What am I doing wrong? 我究竟做错了什么?
You don't have a route set up to handle the $id
coming in. The resource method within the Route class will provide a GET route into your Lesson_unitsController
controller without an expectation of any variable. 您没有设置用于处理传入$id
的路由 Lesson_unitsController
类中的resource方法将为您的Lesson_unitsController
控制器提供GET路由,而无需任何变量。 It is the default index route, and by default doesn't pass a variable. 这是默认的索引路由,默认情况下不传递变量。
There are a couple of ways to do this, but the easiest is to just create a new route for your specific need: 有两种方法可以做到这一点,但是最简单的方法就是根据您的特定需求创建一条新路线:
Route::get('lesson_units/{id}', 'Lesson_unitsController@specificIndex');
And then make your specificIndex
function in your controller with an incoming variable: 然后使用输入变量在控制器中创建specificIndex
函数:
public function specialIndex($id)
{
$course = Course::find($id);
// return view to whatever you like
}
HTH HTH
Try to understand the concept of RESTful and CRUD . 尝试了解RESTful和CRUD的概念。
By using Route::resource('courses', 'CoursesController');
通过使用Route::resource('courses', 'CoursesController');
, Laravel has helped you to register the following routes: ,Laravel帮助您注册了以下路线:
Route::get('courses', 'CoursesController@index');
Route::get('courses/create', 'CoursesController@create');
Route::post('courses/{course}', 'CoursesController@store');
Route::get('courses/{course}/edit', 'CoursesController@edit');
Route::put('courses/{course}', 'CoursesController@update');
Route::delete('courses/{course}', 'CoursesController@destroy');
Then, when you make GET request to myapp.build/courses/123
, Laravel will pass the request to the show
function of your CoursesController
like: 然后,当你GET请求myapp.build/courses/123
,Laravel将请求传递到show
您的功能CoursesController
,如:
public function show(Course $course)
{
return view('lesson_units.index')->with('lesson_units', $course->lesson_units);
}
Laravel will automatically resolve the Course
from your database using the parameter passed into the route myapp.build/courses/{course}
. Laravel将使用传递给路由myapp.build/courses/{course}
的参数从数据库自动解析 Course
。
Note: The variable name $course
has to match with the one specify in route /{course}
. 注意:变量名称$course
必须与route /{course}
指定的变量匹配。
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