Added services

This commit moves most controller logic onto Services. Services are part of the Service-Repository pattern. The models act as repositories.

Services are easily testable and are needed for the upcoming API, in order to avoid duplicated code and to maintain a single source of "truth".

 The User, Vacancy and Vote controllers still need their logic moved onto services.

app/Services/CommentService.php

@@ -0,0 +1,27 @@
+<?php
+
+
+namespace App\Services;
+
+
+use App\Application;
+use App\Comment;
+use Illuminate\Support\Facades\Auth;
+
+class CommentService
+{
+
+    public function addComment(Application $application, $comment): Comment {
+        return Comment::create([
+            'authorID' => Auth::user()->id,
+            'applicationID' => $application->id,
+            'text' => $comment,
+        ]);
+    }
+
+    public function deleteComment(Comment $comment): ?bool
+    {
+        return $comment->delete();
+    }
+
+}