Fix #193 & some more bugfixes

The link @Herkarl sent here:
#192 (review)
was correct and the code snippet was almost correct

invoices/views.py

@@ -2,6 +2,7 @@
 from django.http import Http404, HttpResponseRedirect, HttpResponseBadRequest, HttpResponseForbidden, HttpResponseServerError, JsonResponse
 from django.views.decorators.http import require_http_methods, require_GET, require_POST
 from django.contrib.auth.decorators import login_required, user_passes_test
+from django.contrib import messages
 from datetime import date, datetime
 from django.urls import reverse
 from django.core.exceptions import ObjectDoesNotExist
@@ -33,11 +34,7 @@ def new_invoice(request):
  messages.error(request, 'Du har angivit en icke-positiv summa i någon av fakturadelarna')
  valid = False
 
- if len(request.POST.getlist('amounts[]')) != len(request.POST.getlist('budgetLine[]')):
- messages.error(request, 'Sluta fippla')
- valid = False
-
- if len(request.POST.getlist('budgetLine[]')) == 0:
+ if len(request.POST.getlist('budgetLines[]')) == 0:
  messages.error(request, 'Du måste lägga till minst en del på kvittot')
  valid = False
 

templates/invoices/new.html

@@ -5,6 +5,14 @@
 
 {% block full_content %}
 <div id="form">
+ {% if messages %}
+ <ul class="messages" style="margin: 20px 0 0;">
+ {% for message in messages %}
+ <li{% if message.tags %} class="{{ message.tags }}"{% endif %}>{{ message }}</li>
+ {% endfor %}
+ </ul>
+ {% endif %}
+
  <form method="POST" action="" class="form-horizontal" enctype="multipart/form-data">
  <p>Ladda endast upp en faktura i taget.</p>
  <div class="form">