Add part 4d, add 404 for bad queries

README.md

@@ -101,3 +101,7 @@ Make views that do something, just reading the objects' data.
 Make views using templates.
 Edit `urlapp/views.py`.
 Create `urlapp/templates/index.html` and `urlapp/templates/details.html`.
+
+Add 404.
+Edit `urlapp/views.py`.
+

urlapp/views.py

-from django.shortcuts import render
+from django.shortcuts import render, get_object_or_404
 from django.http import HttpResponse
 
 from .models import Url
@@ -16,6 +16,6 @@ def redir(request, url_id):
 
 def url(request, url_id):
     context = {
-        'url': Url.objects.get(id=url_id)
+        'url': get_object_or_404(Url, id=url_id)
     }
     return render(request, 'details.html', context)