Django edit form based on add form?

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If you are extending your form from a ModelForm, use the instance keyword argument. Here we pass either an existing instance or a new one, depending on whether we’re editing or adding an existing article. In both cases the author field is set on the instance, so commit=False is not required. Note also that I’m assuming only the author may edit their own articles, hence the HttpResponseForbidden response.

from django.http import HttpResponseForbidden
from django.shortcuts import get_object_or_404, redirect, render, reverse


@login_required
def edit(request, id=None, template_name="article_edit_template.html"):
    if id:
        article = get_object_or_404(Article, pk=id)
        if article.author != request.user:
            return HttpResponseForbidden()
    else:
        article = Article(author=request.user)

    form = ArticleForm(request.POST or None, instance=article)
    if request.POST and form.is_valid():
        form.save()

        # Save was successful, so redirect to another page
        redirect_url = reverse(article_save_success)
        return redirect(redirect_url)

    return render(request, template_name, {
        'form': form
    })

And in your urls.py:

(r'^article/new/$', views.edit, {}, 'article_new'),
(r'^article/edit/(?P<id>\d+)/$', views.edit, {}, 'article_edit'),

The same edit view is used for both adds and edits, but only the edit url pattern passes an id to the view. To make this work well with your form you’ll need to omit the author field from the form:

class ArticleForm(forms.ModelForm):
    class Meta:
        model = Article
        exclude = ('author',)

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