passing data from middleware to view or alternative way to show specific data in every page

Question

in my website i have a fairly complected category which i have to show in every view (in the client side) so i thought i put the code for creating category in a middleware and pass the result to views

so i've created my middleware but i cant figure out how can i pass its data to my view withouth having to do something in the controllers i've tried these methods in my middleware

<?php

namespace App\Http\Middleware;

use Closure;

class CtegoryMiddleware
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        $request->merge(array("all_categories" => "abc"));
        $request['all_categories']= 'abc';
        return $next($request);
    }
}

route :

Route::group(['middleware' => ['category' ]], function () {
     Route::get('/', 'HomeController@index');
});

but in my view when i echo all_categories i get

Undefined variable: all_categories 

btw i've checked by echoing something , the middleware gets triggered on the request

Answer 1

I think in your use case, using a globally available view variable should suffice.

<?php

namespace App\Http\Middleware;

use Closure;

class CtegoryMiddleware
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        $request->merge(array("all_categories" => "abc"));
        $request['all_categories']= 'abc';

        /**
         * This variable is available globally on all your views, and sub-views
         */
        view()->share('global_all_categories', 'abc');

        return $next($request);
    }
}

The variable is loaded once (if you do database query, the query will only execute once), and the variable is then stored in the View factory.