feat: added eligibility check to application save method

This commit addresses an issue where users could submit as many applications as they wanted by simply navigating to the previous page and resubmitting the form, therefore bypassing validation that was only existent in the  front end.
Fixes #20.

app/Http/Controllers/ApplicationController.php

@@ -96,8 +96,8 @@ class ApplicationController extends Controller
 
     public function saveApplicationAnswers(Request $request, $vacancySlug)
     {
+        if (Auth::user()->isEligible()) {
             try {
-
                 $this->applicationService->fillForm(Auth::user(), $request->all(), $vacancySlug);
 
             } catch (VacancyNotFoundException | IncompleteApplicationException | UnavailableApplicationException $e) {
@@ -112,6 +112,11 @@ class ApplicationController extends Controller
                 ->with('success', __('Thank you! Your application has been processed and our team will get to it shortly.'));
         }
 
+        return redirect()
+            ->to(route('showUserApps'))
+            ->with('error', __('Your account is not eligible to submit a new application.'));
+    }
+
     public function updateApplicationStatus(Request $request, Application $application, $newStatus)
     {
         $messageIsError = false;

app/User.php

@@ -121,19 +121,17 @@ class User extends Authenticatable implements MustVerifyEmail
 
 
     public function isEligible(): bool {
-        $eligible = false;
-        $lastApplication = Application::where('applicantUserID', $this->id)->latest()->first();
+        $lastApplication = Application::where('applicantUserID', $this->getAttribute('id'))->latest()->first();
 
         if (is_null($lastApplication)) {
-           $eligible = true;
+            return true;
         }
 
         if ($lastApplication->created_at->diffInMonths(now()) > 1 && in_array($lastApplication->applicationStatus, ['DENIED', 'APPROVED'])) {
-
-            $eligible = true;
+            return true;
         }
 
-        return $eligible;
+        return false;
     }