Add FlushEntityManager middleware.

Author: szainmehdi

README.md

@@ -108,6 +108,23 @@ php artisan make:doctrine:mapping MyValue --value
 
 By default, this will create a new file in `app/Database/Doctrine/Mappings/Values/` called `MyValueMapping.php`. 
 
+### FlushEntityManager Middleware
+
+Simplify the process of actually persisting your entities to the database using the included middleware.
+
+Add the middleware to your `app/Http/Kernel.php` file like so:
+```php
+class Kernel extends HttpKernel
+{
+    // ...
+
+    protected $middleware = [
+        // ...
+        \Zain\LaravelDoctrine\Jetpack\Middleware\FlushEntityManager::class,
+    ];
+}
+```
+
 ### Helpers
 
 #### Entity Serialization

src/Middleware/FlushEntityManager.php

@@ -0,0 +1,29 @@
+<?php declare(strict_types=1);
+
+namespace Zain\LaravelDoctrine\Jetpack\Middleware;
+
+use Closure;
+use Doctrine\ORM\EntityManagerInterface as EntityManager;
+use Illuminate\Http\Request;
+
+class FlushEntityManager
+{
+    private EntityManager $em;
+
+    public function __construct(EntityManager $em)
+    {
+        $this->em = $em;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function handle(Request $request, Closure $next)
+    {
+        $response = $next($request);
+
+        $this->em->flush();
+
+        return $response;
+    }
+}