Laravel : How to handle Exception in View composer - php

Question

In my laravel 5.5 project, view composers are used for passing data to the views.
In the view composer's constructor() a try catch block is used to catch the exceptions and a custom exception is rethrown from the catch method.
In the default exception handler of the application, custom exception is handled to display my custom error view.
Problem : The custom exception is not working properly when thrown from the view composer. Laravel's default exception error page is shown instead of my custom error page.
ProductComponentComposer.php
namespace App\Http\ViewComposers;
use Illuminate\View\View;
use App\Repositories\ProductRepository;
use Exception;
use App\Exceptions\AppCustomException;
class ProductComponentComposer
{
protected $products;
/**
* Create a new product partial composer.
*
* #param ProductRepository $productRepo
* #return void
*/
public function __construct(ProductRepository $productRepo)
{
try {
$this->products = $productRepo->getProducts();
} catch (Exception $e) {
throw new AppCustomException("CustomError", 1001);
}
}
/**
* Bind data to the view.
*
* #param View $view
* #return void
*/
public function compose(View $view)
{
$view->with(['productsCombo' => $this->products]);
}
}
Handler.php
public function render($request, Exception $exception)
{
if($exception instanceof AppCustomException) {
//custom error page when custom exception is thrown
return response()->view('errors.app-custom-exception', compact('exception'));
}
return parent::render($request, $exception);
}
Note : The custom exception is handled properly if thrown from the controller.
I also tried throwing the exception from the compose() method of the ProductComponentComposer instead of the __constructor(). But that also not working.
How to fix this to get my custom exception view if any exception is occured in the view composer?
Thanks in advance..

Answer 1

I had the same issue where a custom exception was thrown within a method in my view composer class, yet \ErrorException is what I got displayed.
There's a handler on a framework's level (\laravel\framework\src\Illuminate\View\Engines\PhpEngine.php:45) I believe is causing this.
Fix I've applied:
App\Exceptions\Handler.php
public function render($request, Exception $exception)
{
if ($exception instanceof AppCustomException ||
$exception instanceof \ErrorException &&
$exception->getPrevious() instanceof AppCustomException
) {
//custom error page when custom exception is thrown
return response()->view('errors.app-custom-exception', compact('exception'));
}
// default
return parent::render($request, $exception);
}
Make sure that what you're getting really is an instance of \ErrorException