Get Primary Key after Saving a ModelForm in Django


Question

How do I get the primary key after saving a ModelForm? After the form has been validated and saved, I would like to redirect the user to the contact_details view which requires the primary key of the contact.

def contact_create(request):
    if request.method == 'POST':
        form = ContactForm(request.POST)
        if form.is_valid():
            form.save()
            return HttpResponseRedirect(reverse(contact_details, args=(form.pk,)))
    else:
        form = ContactForm()
1
38
4/9/2009 5:38:47 AM

Accepted Answer

The ModelForm's save method returns the saved object.

Try this:

def contact_create(request):
    if request.method == 'POST':
        form = ContactForm(request.POST)
        if form.is_valid():
            new_contact = form.save()
            return HttpResponseRedirect(reverse(contact_details, args=(new_contact.pk,)))
    else:
        form = ContactForm()
52
4/9/2009 1:55:17 PM

In the case where you have set form.save(commit=False) because you want to modify data and you have a many-to-many relation, then the answer is a little bit different:

def contact_create(request):
    if request.method == 'POST':
        form = ContactForm(request.POST)
        if form.is_valid():
            new_contact = form.save(commit=False)
            new_contact.data1 = "gets modified"
            new_contact.save()
            form.save_m2m()
            return HttpResponseRedirect(reverse(contact_details, args=(new_contact.pk,)))
    else:
        form = ContactFrom()

https://docs.djangoproject.com/en/1.3/topics/forms/modelforms/#the-save-method


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