custom validation, method not allowed on error - laravel

Question

<form method="post" action="{{action('PLAYERController#update', $ply->reg_no)}}">
{{csrf_field()}}
Getting method not allowed exception on custom validation with false return. Tried mentioning PUT, PATCH and DELETE inside csrf field. Still, does not work.
UPDATE
using post for form method. Using method_field('POST'). not defining get method for the update function. If I go back from the error page back to the form page and press refresh, then the validation message is displayed as it should.
UPDATE 2
Validator::extend('check_sold_amount', function($attribute, $value, $parameters, $validator) {
if(($value%5000)==0)
{
return true;
}
return false;
});
}
UPDATE 3
Controller code
public function update(Request $request, $reg_no)
{
//
$this->validate($request, [
'sold_amount' => 'required|check_sold_amount',
'sold_to_team'=>'required'
]);
$ply = Player::find($reg_no);
$ply->sold_amount = $request->get('sold_amount');
$ply->sold_to_team = $request->get('sold_to_team');
$team_name=$ply->sold_to_team;
$team=Team::find($team_name);
if($ply->category=='indian')
{
$team->indian_players=$team->indian_players+1;
}
else {
$team->foreign_players=$team->foreign_players+1;
}
$team->balance=$team->balance-$ply->sold_amount;
$ply->save();
$team->save();
//return view('player.index');
}

Answer 1

Method not allowed means you do not have a route set up for the request that happened. There are 2 possibilities:
The route for the form submission is not set up
The code you have shown us does not include any method_field(...), so it looks like you are doing a normal POST. So you need a corresponding POST route like:
Route::post('/some/path', 'PLAYERController#update');
The route for the failed validation response is not set up
I'm guessing this is the problem. Say you are on pageX, and you landed here via a POST. You have a post route set up, so that you can land on this page OK. Now from this page, you submit the form you have shown us, but validation fails. When that happens, Laravel does a GET redirect back to pageX. But you have no GET route set up for pageX, so you'll get a Method not allowed.
Along with your POST route for the current page, you need a GET route to handle failed validations.
Also, you say Tried mentioning PUT, PATCH and DELETE inside csrf field - as others pointed out, you should use method_field() to spoof form methods, eg:
<form ...>
{{ csrf_field() }}
{{ method_field('PATCH') }}
Laravel form method spoofing docs
UPDATE
Based on your comments, I think it is actually your initial POST that is failing. Checking your code again, I think your action() syntax is incorrect.
According to the docs, if the method specified in the action() helper takes parameters, they must be specified as an array:
action="{{ action('PLAYERController#update', ['reg_no' => $ply->reg_no]) }}"

Answer 2

If your update route using patch method (example Route::patch('.....');) then add this {{ method_field('PATCH') }} below {{csrf_field()}} in your update form
UPDATE
If you are not using PATCH method for the update route, try this :
Route::patch('player/update/{reg_no}', 'PLAYERController#update')->name('plyupdate');
and then in the form you can do like below :
<form method="POST" action="{{route('plyupdate', $ply->reg_no)}}">
{{csrf_field()}}
{{ method_field('PATCH') }}
//Necessary input fields and the submit button here
</form>
This way always works fine for me. If it still didn't work, maybe there's something wrong in your update method in the controller
UPDATE
Untested, in your update method try this :
public function update(Request $request, $reg_no) {
$input = $request->all();
$ply = Player::find($reg_no);
$validate = Validator::make($input, [
'sold_amount' => 'required|check_sold_amount',
'sold_to_team'=>'required'
]);
if ($validate->fails()) {
return back()->withErrors($validate)->withInput();
}
$ply->sold_amount = $request->get('sold_amount');
$ply->sold_to_team = $request->get('sold_to_team');
$team_name=$ply->sold_to_team;
$team=Team::find($team_name);
if($ply->category=='indian') {
$team->indian_players=$team->indian_players+1;
}
else {
$team->foreign_players=$team->foreign_players+1;
}
$team->balance=$team->balance-$ply->sold_amount;
$ply->save();
$team->save();
return view('player.index');
}
Don't to forget to add use Validator; namespace

Answer 3

namespace App\Http\Controllers;
use App\User;
use App\Http\Controllers\Controller;
class UserController extends Controller
{
/**
* Show the profile for the given user.
........................
Did you reference a validation request controller?
Hope this helps :)