我遇到CRUD路线问题。在我的控制器UserGroupsController中的方法编辑中,参数$ userGroup为空。
UserGroupsController
class UserGroupsController extends Controller
{
public function edit(UserGroup $userGroup)
{
if (Auth::check())
{
$users = User::pluck('name','id')->all();
$groups = Group::pluck('name','id')->all();
return view('users-group.edit', compact('userGroup','users','groups'));
}else{
return redirect('login');
}
}
}
edit.blade.php
<div class="panel panel-default">
<div class="panel-heading">Edit</div>
<div class="panel-body">
{{ $userGroup }}
{!! Form::model($userGroup,['method' => 'PATCH', 'route' => ['users-group.update', $userGroup->id], 'id' => 'user_group-form', 'class' => 'form-horizontal'] ) !!}
{{ csrf_field() }}
<input type='hidden' name='id' value='{!! $userGroup->id !!}'>
@include('users-group.form',array('submitButton' => 'Edit User Group'))
{!! Form::close() !!}
</div>
form.blade.php
<div class="form-group">
<label for="user_id" class="col-md-4 control-label">User</label>
<div class="col-md-6">
{!! form::select('user_id', $users, $userGroup->user_id,['class' => 'form-control']) !!}
</div>
</div>
<div class="form-group">
<label for="group_id" class="col-md-4 control-label">Group</label>
<div class="col-md-6">
{!! form::select('group_id', $groups, $userGroup->group_id,['class' => 'form-control']) !!}
</div>
</div>
<div class="form-group">
<div class="col-md-6 col-md-offset-4">
{!! Form::submit($submitButton) !!}
</div>
</div>
路线:
Route::group(['middleware'=>['web']], function ()
{
Route::resource('users','UsersController');
Route::resource('users-group','UserGroupsController');
Route::resource('companies','CompaniesController');
});
php artisan route:list:
| | POST | users-group | users-group.store | App\Http\Controllers\UserGroupsController@store | web |
| | GET|HEAD | users-group/create | users-group.create | App\Http\Controllers\UserGroupsController@create | web |
| | PUT|PATCH | users-group/{users_group} | users-group.update | App\Http\Controllers\UserGroupsController@update | web |
| | DELETE | users-group/{users_group} | users-group.destroy | App\Http\Controllers\UserGroupsController@destroy | web |
| | GET|HEAD | users-group/{users_group} | users-group.show | App\Http\Controllers\UserGroupsController@show | web |
| | GET|HEAD | users-group/{users_group}/edit | users-group.edit | App\Http\Controllers\UserGroupsController@edit
DD($ userGroup表示):
UserGroup {#199 ▼
#fillable: array:2 [▼
0 => "user_id"
1 => "group_id"
]
#connection: null
#table: null
#primaryKey: "id"
#keyType: "int"
#perPage: 15
+incrementing: true
+timestamps: true
#attributes: []
#original: []
#relations: []
#hidden: []
#visible: []
#appends: []
#guarded: array:1 [▶]
#dates: []
#dateFormat: null
#casts: []
#touches: []
#observables: []
#with: []
+exists: false
+wasRecentlyCreated: false
}
在edit.blade.php文件中,我打印变量$ userGroup,但返回&#34; []&#34;。我和UsersControllers有相同的代码,但有效。
当我提交表单时,我收到了这个错误:
MethodNotAllowedHttpException in RouteCollection.php
对不起英语,我希望你能理解我的问题,我可以提供更多信息。感谢
答案 0 :(得分:3)
这是您的代码中的问题。从php artisan route:list
的输出中可以明显看出,参数名称(UserGroupsController中的编辑函数所期望的)是$users_group
,而不是$userGroup
。因此,我为您提出两个简单的解决方案。
解决方案#1 像这样更改UserGroupsController的编辑功能。
class UserGroupsController extends Controller
{
public function edit(UserGroup $user_group)
{
if (Auth::check())
{
$users = User::pluck('name','id')->all();
$groups = Group::pluck('name','id')->all();
return view('users-group.edit', compact('userGroup','users','groups'));
}else{
return redirect('login');
}
}
}
或
解决方案2
更改您的路线功能,以便php artisan route:list
将其输出。
| | POST | users-group | users-group.store | App\Http\Controllers\UserGroupsController@store | web |
| | GET|HEAD | users-group/create | users-group.create | App\Http\Controllers\UserGroupsController@create | web |
| | PUT|PATCH | users-group/{userGroup} | users-group.update | App\Http\Controllers\UserGroupsController@update | web |
| | DELETE | users-group/{userGroup} | users-group.destroy | App\Http\Controllers\UserGroupsController@destroy | web |
| | GET|HEAD | users-group/{userGroup} | users-group.show | App\Http\Controllers\UserGroupsController@show | web |
| | GET|HEAD | users-group/{userGroup}/edit | users-group.edit | App\Http\Controllers\UserGroupsController@edit
请注意,users_group
必须更改为userGroup
。
好的,但是为什么?
这是因为Laravel's Implicit Route Binding。 Laravel自动解析在路由或控制器操作中定义的口才模型,这些操作的类型提示变量名称与路由段名称匹配。例如:
Route::get('api/users/{user}', function (App\User $user) {
return $user->email;
});
由于$user
变量的类型提示为App\User
雄辩模型,并且变量名称与{user}
URI段匹配,因此Laravel将自动注入ID匹配的模型实例来自请求URI的相应值。如果变量名称与{user} URI段不匹配,则Laravel将不会注入任何模型实例,因此该变量将被保留为空。
答案 1 :(得分:2)
edit
方法通常会获得ID。要解决您的问题,请从标题中删除该类型,然后在您的方法中获取模型:
class UserGroupsController extends Controller
{
public function edit($id)
{
$userGroup = UserGroup::findOrFail($id);
if (Auth::check())
{
$users = User::pluck('name','id')->all();
$groups = Group::pluck('name','id')->all();
return view('users-group.edit', compact('userGroup','users','groups'));
}else{
return redirect('login');
}
}
}
答案 2 :(得分:2)
答案 3 :(得分:0)
通过将变量名$ userGroup更改为$ usergroup(请注意小写字母'G',与资源路由名称匹配)。因此,资源将从数据库返回数据。
在laravel中,传递的路由变量必须与接收的模型或控制器资源匹配
答案 4 :(得分:0)
如果您在数据库中的表名称为 users_group (下划线),则资源路由器应适用于['index','store','show','create ','update','destroy']与
Route::resource('users_group','UserGroupsController');
dd response: #connection: "mysql"
但不
Route::resource('users-group','UserGroupsController');
dd response: #connection: null