updating the data in pivot table laravel 5 - php

Question

i have a many to many realtionship and a pivot table now i want to update the pivot table data with a form that users sends. here for example is assign a client to a sellman . here is my code :
in route :
Route::get('admin/client/assign','ClientController#assignsellman');
controller :
public function assignsellman(Request $request){
$user = User::all();
$client_list = Client::all();
$client = Client::with('sellmanlist')->firstOrFail();
$sellman = $request->input('sellman');
$client->sellmanlist()->attach($sellman);
return view('admin.client.assign',compact('client_list','user'));
}
and finally here is the form of view file that i want to get 2 variables one the id of the client and the secound the id of sell man
<form action="/admin/client/" method="post">
<input type="hidden" name="_method" value="PUT">
{{ csrf_field() }}
<div class="row">
<div class="col-xs-4">
<div class="form-group">
<label for="client">مشتری</label>
<select class="select-search select2-hidden-accessible" tabindex="-1" aria-hidden="true"
name="client">
#foreach($client_list as $client_lists)
<option value="">{{$client_lists->title}}</option>
#endforeach
</select>
</div>
</div>
<div class="col-xs-4 text-center">
<i class="icon-arrow-left7 mr-3 icon-3x" style="font-size: 130px"></i>
<h4>ارجاع به</h4>
</div>
<div class="col-xs-4">
<div class="form-group">
<div class="form-group">
<label for="sellman">کارشناس فروش</label>
<select class="select-search select2-hidden-accessible" tabindex="-1"
aria-hidden="true" name="sellman">
#foreach($user as $users)
<option value="1">{{$users->name}}</option>
#endforeach
</select>
</div>
</div>
</div>
</div>
#if ($errors->any())
<div class="alert alert-danger">
<ul>
#foreach ($errors->all() as $error)
<li>{{ $error }}</li>
#endforeach
</ul>
</div>
#endif
<button type="submit" class="btn btn-primary">تایید</button>
</form>
with this code i get this error
Symfony \ Component \ HttpKernel \ Exception \ MethodNotAllowedHttpException
No message
thanks for help

Answer 1

Edit your route
Route::post('admin/client/','ClientController#assignsellman');

Answer 2

That is because the route you've created is HTTP GET, and in your form you're using HTTP Post.
<form action="/admin/client/" method="post">
Try switching to a GET method and it should work
<form action="/admin/client/" method="get">
or switch your route to
Route::post('admin/client/assign','ClientController#assignsellman');
Please take a look at the different HTTP Verbs and apply them to your needs.
https://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html