Show a message if the invitation code is wrong

bigday/templates/index.html

@@ -109,6 +109,12 @@
 
         <p>Kindly let us know if you will be able to attend our wedding! On the back of your invitation should be a two-digit code. Please enter that in the box below, which will take you to a personalized RSVP form.</p>
 
+        {% if invalid_code %}
+        <div class="alert alert-danger" role="alert">
+        Sorry, this invitation code doesn't seem quite right...
+        </div>
+        {% endif %}
+        
         <form action="{% url 'rsvp' %}" method="get" class="form-inline justify-content-center">
             <label class="sr-only" for="rsvp-code">RSVP Code</label>
             <div class="input-group mr-2">

bigday/views.py

@@ -9,6 +9,9 @@ def rsvp(request):
     rsvpCode = request.GET['rsvp-code']
     guests = InvitedGuest.objects.filter(rsvpCode = rsvpCode)
     if request.method == 'GET':
+        if not guests:
+            # No guests with that code
+            return render(request, 'index.html', {'invalid_code': True})
         return render (request, 'rsvp.html', {'guests':guests, 'rsvpCode': rsvpCode})
     elif request.method == 'POST':
         any_attending = False