Fix logic and add check for duplicated data

Changelog

@@ -1,4 +1,5 @@
 2019-03-21 DariusIII
+	* Fix: Fix logic and add check for duplicated data
 	* Chg: Use separate query to add releases to cart as we only need the id, so no need to use heavier getByGuid function
 	* Chg: Update font-awesome to latest version
 	* Chg: Update rtconner/laravel-tagging (3.1.0 => 3.1.1), wildbit/swiftmailer-postmark (3.0.1 => 3.0.2)

app/Http/Controllers/CartController.php

@@ -4,6 +4,7 @@ namespace App\Http\Controllers;
 
 use App\Models\Release;
 use App\Models\UsersRelease;
+use Illuminate\Database\QueryException;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\Auth;
 
@@ -40,12 +41,15 @@ class CartController extends BasePageController
 
         $data = Release::query()->whereIn('guid', $guids)->select(['id'])->get();
 
-        if (! empty($data)) {
+        if (empty($data)) {
             return redirect('/cart/index');
         }
 
         foreach ($data as $d) {
-            UsersRelease::addCart($this->userdata->id, $d['id']);
+            $check = UsersRelease::whereReleasesId($d['id'])->first();
+            if (empty($check)) {
+                UsersRelease::addCart($this->userdata->id, $d['id']);
+            }
         }
         return redirect('/cart/index');
     }