There was a task to submit form with ajax, with server side validation of course. Obvious solution is to do validation and return json with erros.
I didn't like idea of writing separate view for validation and then inserting errors in form html on client side. Especially since I already had a generic template for django form with errors display.
User will see process like this:
Server will return piece of html that will replace part of page with article or form (with errors if needed). Actually this sentence is the most important part of this blog post. Implementation is very simple and straightforward.
Well actually the fact that you can return parts of html from server is also not new idea at all. It's just only now I finally understood that using this technique you can create more complicated things than modal window or tabs
def edit_new(request, new_id): new = get_object_or_404() if request.method == 'POST': form = NewsForm(request.POST, instance=new) if form.is_valid(): new = form.save() return render_to_response('include/new.html', dict(new=new)) else: form = NewsForm(instance=new) return render_to_response('include/form.html', dict(form=form, new=new))
Code can be cleaned up of course, I just wanted to show the idea.
I'm translating this article almost five years after it was originally written and of course now it seems very childish :) Now we have angular and ajax forms are implemented a little differently. Still this old solution is not all that bad. I'd still replace one thing here - it's better to return json with html from server instead of just html.
Programmatic generation of PDF files is a frequent task when developing applications that can export reports, bills, or questionnaires. In this article, we will consider three common tools for creating PDFs, including their installation and converting principles.
Nowadays, when every second large company has developed its own instant messenger, in the era of iMessages, Slack, Hipchat, Messager, Google Allo, Zulip and others, I will tell you how to keep up with the trend and write your own chat, using django-channels 0.17.3, django 1.10.x, python 3.5.x.
I just found out that __or__ and __and__ are defined for QuerySet. This means that to do queries union or intersection, you can do:User.objects.filter(...) | User.objects.filter(...)User.objects.filter(...) & User.objects.filter(...)