Correct if I'm wrong:
... def get_absolute_url(self): return '/pages/%s' % self.slug urls.py :
url(r'^pages/(?P<slug>.*)/$', 'APP.views.view_page'), def view_page(request, slug): page = get_object_or_404(Page, slug=slug) return render_to_response('TEMPLATE', {'x': page}) I can’t understand how get-object-or_404 , the first parameter is a model, and the second slug is a field in the model, accepts a variable from url.py : <slug> and checks if they are equal (read: the part of the entered URL is regular with model.slug ) loads the page, and otherwise 404. So? And that awful description here: get_object_or_404 .
get_object_or_404(klass, *args, **kwargs) Calls get() on a given model manager, but it raises Http404 instead of the model's DoesNotExist exception. Required arguments klass A Model, Manager or QuerySet instance from which to get the object. **kwargs Lookup parameters, which should be in the format accepted by get() and filter(). Example The following example gets the object with the primary key of 1 from MyModel: from django.shortcuts import get_object_or_404 def my_view(request): my_object = get_object_or_404(MyModel, pk=1) This example is equivalent to: from django.http import Http404 def my_view(request): try: my_object = MyModel.objects.get(pk=1) except MyModel.DoesNotExist: raise Http404 Note: As with get(), a MultipleObjectsReturned exception will be raised if more than one object is found. get_list_or_404 get_list_or_404(klass, *args, **kwargs) Returns the result of filter() on a given model manager, raising Http404 if the resulting list is empty. Required arguments klass A Model, Manager or QuerySet instance from which to get the list. **kwargs Lookup parameters, which should be in the format accepted by get() and filter(). Example The following example gets all published objects from MyModel: from django.shortcuts import get_list_or_404 def my_view(request): my_objects = get_list_or_404(MyModel, published=True) This example is equivalent to: from django.http import Http404 def my_view(request): my_objects = list(MyModel.objects.filter(published=True)) if not my_objects: raise Http404 Questions/Feedback Having trouble? We'd like to help! Try the FAQ — it's got answers to many common questions. Search for information in the archives of the django-users mailing list, or post a question. Ask a question in the #django IRC channel, or search the IRC logs to see if it has been asked before. If you notice errors with this documentation, please open a ticket and let us know! Please only use the ticket tracker for criticisms and improvements on the docs. For tech support, use the resources above. Search Version: Contents Django shortcut functions render Required arguments Optional arguments Example render_to_response Required arguments Optional arguments Example redirect Examples get_object_or_404 Required arguments Example get_list_or_404 Required arguments Example Browse Prev: File Uploads Next: Generic views Table of contents General Index Python Module Index You are here: Django dev documentation Using Django Handling HTTP requests Django shortcut functions Download: Offline (development version): HTML | PDF | ePub Provided by Read the Docs. © 2005-2012 Django Software Foundation unless otherwise noted. Django is a registered trademark of the Django Software Foundation. Linux Web hosting graciously provided by Media Temple. ]( https://docs.djangoproject.com/en/dev/topics/http/shortcuts/#get-object-or-404) If I implemented everything as correct and I don’t have any mistakes, then I ask for advice on how to elegantly add .html without / at the end of the URL, without writing .html in the template.
