For all of these views we’ve tried to mimic the API of Django’s existing class-based views as closely as possible, so they should feel natural to anyone who’s already familiar with Django’s views.
This is the formset equivalent of Django’s FormView. Use it when you want to display a single (non-model) formset on a page.
A simple formset:
from extra_views import FormSetView from foo.forms import MyForm class MyFormSetView(FormSetView): template_name = 'myformset.html' form_class = MyForm success_url = 'success/' def get_initial(self): # return whatever you'd normally use as the initial data for your formset. return data def formset_valid(self, formset): # do stuff return super(MyFormSetView, self).formset_valid(formset)
This view will render the template myformset.html with a context variable formset representing the formset of MyForm. Once POSTed and successfully validated, formset_valid will be called which is where your handling logic goes, then it redirects to success_url.
FormSetView exposes all the parameters you’d normally be able to pass to formset_factory. Example (using the default settings):
class MyFormSetView(FormSetView): template_name = 'myformset.html' form_class = MyForm success_url = 'success/' extra = 2 max_num = None can_order = False can_delete = False ...
ModelFormSetView makes use of Django’s modelformset_factory, using the declarative syntax used in FormSetView as well as Django’s own class-based views. So as you’d expect, the simplest usage is as follows:
from extra_views import ModelFormSetView from foo.models import MyModel class MyModelFormSetView(ModelFormSetView): template_name = 'mymodelformset.html' model = MyModel
Like FormSetView, the formset variable is made available in the template context. By default this will populate the formset with all the instances of MyModel in the database. You can control this by overriding get_queryset on the class, which could filter on a URL kwarg (self.kwargs), for example:
class MyModelFormSetView(ModelFormSetView): template_name = 'mymodelformset.html' model = MyModel def get_queryset(self): slug = self.kwargs['slug'] return super(MyModelFormSetView, self).get_queryset().filter(slug=slug)
When you want to edit models related to a parent model (using a ForeignKey), you’ll want to use InlineFormSetView. An example use case would be editing user reviews related to a product:
from extra_views import InlineFormSetView class EditProductReviewsView(InlineFormSetView): model = Product inline_model = Review ...
Aside from the use of model and inline_model, InlineFormSetView works more-or-less in the same way as ModelFormSetView.
You can also use generic relationships for your inline formsets, this makes use of Django’s generic_inlineformset_factory. The usage is the same, but with the addition of ct_field and ct_fk_field:
from extra_views.generic import GenericInlineFormSetView class EditProductReviewsView(GenericInlineFormSetView): model = Product inline_model = Review ct_field = "content_type" ct_fk_field = "object_id" max_num = 1 ...
CreateWithInlinesView and UpdateWithInlinesView¶
These are the most powerful views in the library, they are effectively replacements for Django’s own CreateView and UpdateView. The key difference is that they let you include any number of inline formsets (as well as the parent model’s form), this provides functionality much like the Django Admin change forms. The API should be fairly familiar as well. The list of the inlines will be passed to the template as context variable inlines.
Here is a simple example that demonstrates the use of each view with both normal inline relationships and generic inlines:
from extra_views import InlineFormSet, CreateWithInlinesView, UpdateWithInlinesView, from extra_views.generic import GenericInlineFormSet class ItemsInline(InlineFormSet): model = Item class TagsInline(GenericInlineFormSet): model = Tag class OrderCreateView(CreateWithInlinesView): model = Order inlines = [ItemsInline, TagsInline] def get_success_url(self): return self.object.get_absolute_url() class OrderUpdateView(UpdateWithInlinesView): model = Order form_class = OrderForm inlines = [ItemsInline, TagsInline] def get_success_url(self): return self.object.get_absolute_url()