Laravel 5.7错误消息“Symfony \ Component \ HttpKernel \ Exception \ MethodNotAllowedHttpException没有消息”

我整天都在收到这个错误，但似乎无法做到这一点 . 我的目标基本上是更新admin_users表中的用户，以便更改他们的卷 .

这是错误 .

Symfony \ Component \ HttpKernel \ Exception \ MethodNotAllowedHttpException没有消息Laravel 5.7

Web.php

Route::get('/dashboard', 'DashboardController@dashboard');
Route::post('/admin_users', 'AdminUController@admin_users')->name('admin_users.update');
Route::get('/admin_users', 'AdminUController@admin_users')->name('admin_users');

这是Controller AdminUController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Post;
use Mail;
use Session;
use Gate;
use App\Admin_users;

class AdminUController extends Controller
{

    public function admin_users(){

        if(!Gate::allows('isUser')){
            if(!Gate::allows('isAdmin')){
                abort(404,"Sorry, There is nothing to see here!");
            }
       }

        // data from users table to be passed to the view
        $admin_users = Admin_users::all();

         $title = 'Earn, Invest, Save, and Learn with the Invo App';
         return view('admin_users', ['admin_users' => $admin_users])->with('title',$title);
     }

     public function update(Request $request, Admin_users $admin_users){
        $admin_users->email = $request->email;
        $admin_users->user_type = $request->user_type;
        $admin_users->save();
        session()->flash('User account has been updated!');
        return redirect()->back();
     }
}

这是Model Admin_users.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Admin_users extends Model
{
    protected $guarded=[];
    //public function admin_users(){

   // }
}

这是刀片模板admin_users.blade.php

@extends('layouts.app_dashboard')
@section('content')
<div class="col-md-12">
    <div class="margin-top card strpied-tabled-with-hover">
            <div class="card-header ">
                <h4 class="card-title">Invo Admin Users</h4>
                <p class="card-category">Click to edit each user</p>
                <a href="{{ route('register') }}" class="btn btn-primary margin-top">
                        Add New User
                </a>
            </div>
            <div class="card-body table-full-width table-responsive">
                <table class="table table-hover table-striped">
                    <thead>
                        <tr><th>ID</th>
                        <th>Name</th>
                        <th>Email</th>
                        <th>Password </th>
                        <th>User Access</th>
                    </tr></thead>
                    <tbody>
                        @foreach ($admin_users as $user)
                        @if(session()->has('message'))
                            <div class="alert alert-success">
                                {{session()->get('message')}}
                            </div>
                        @endif
                        <form method="POST" action="{{route('admin_users.update', $user->id)}}">
                         @csrf
                         @method('put')
                        <tr>
                            <td>{{$user->id}}</td>
                        <td>{{$user->name}}</td>
                            <td>
                                <input type="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp" placeholder="{{$user->email}}">
                            </td>
                            <input type="file" class="custom-file-input" value="" placeholder="{{$user->email}}">
                            <td>*********</td>
                            <td>
                                <select class="selectpicker">
                                    @if(Auth::id() == $user->id)
                                        <option selected value="{{$user->user_type}}">{{$user->user_type}}</option>
                                        <option value="user">user</option>
                                    @else
                                        <option selected value="{{$user->user_type}}">{{$user->user_type}}</option>
                                        <div role="separator" class="dropdown-divider"></div>
                                        <a class="dropdown-item" href="#">Change User Type to</a>
                                        @if($user->user_type == 'admin')
                                            <option value="user">user</option>
                                        @else
                                            <option value="admin">admin</option>
                                        @endif
                                    @endif


                                </select> 
                            </td>
                            <td>
                                <button type="submit" class="btn btn-primary">
                                    Update
                                </button>
                            </td>
                        </tr>
                        </form>
                        @endforeach
                    </tbody>
                </table>
            </div>
        </div>
    </div>
    @endsection