handling all post prevents errors.

django/didgeridoo/currencies/models.py

@@ -25,3 +25,7 @@ class ExchangeRate(models.Model):
 
     def __str__(self):
         return str(self.name)
+
+    class Meta:
+        # https://simpleisbetterthancomplex.com/tips/2016/10/06/django-tip-17-earliest-and-latest.html
+        get_latest_by = 'name__name'

django/didgeridoo/currencies/views.py

@@ -12,11 +12,8 @@ from django.http import JsonResponse
 
 def currency_update(request):
     # https://simpleisbetterthancomplex.com/tutorial/2016/08/29/how-to-work-with-ajax-request-with-django.html
-    currency = request.GET.get('currency_update', None)
-    data = ExchangeRate.objects.filter(
-            name__name=currency
-            ).values('exchange_rate_to_chf'
-                     ).latest('date__date')
+    currency = request.POST.get('currency_update', None)
+    data = ExchangeRate.objects.values('exchange_rate_to_chf').latest()
     print('currency: ', currency, 'data: ', data)
     return JsonResponse(data)