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Formsets
========
.. versionadded:: 1.0
Polymorphic models can be used in formsets.
The implementation is almost identical to the regular Django :doc:`django:topics/forms/formsets`.
As extra parameter, the factory needs to know how to display the child models.
Provide a list of :class:`~polymorphic.formsets.PolymorphicFormSetChild` objects for this.
.. code-block:: python
from polymorphic.formsets import polymorphic_modelformset_factory, PolymorphicFormSetChild
ModelAFormSet = polymorphic_modelformset_factory(ModelA, formset_children=(
PolymorphicFormSetChild(ModelB),
PolymorphicFormSetChild(ModelC),
))
The formset can be used just like all other formsets:
.. code-block:: python
if request.method == "POST":
formset = ModelAFormSet(request.POST, request.FILES, queryset=ModelA.objects.all())
if formset.is_valid():
formset.save()
else:
formset = ModelAFormSet(queryset=ModelA.objects.all())
Like standard Django :doc:`django:topics/forms/formsets`, there are 3 factory methods available:
* :func:`~polymorphic.formsets.polymorphic_modelformset_factory` - create a regular model formset.
* :func:`~polymorphic.formsets.polymorphic_inlineformset_factory` - create a inline model formset.
* :func:`~polymorphic.formsets.generic_polymorphic_inlineformset_factory` - create an inline formset
for a generic foreign key.
Each one uses a different base class:
* :class:`~polymorphic.formsets.BasePolymorphicModelFormSet`
* :class:`~polymorphic.formsets.BasePolymorphicInlineFormSet`
* :class:`~polymorphic.formsets.BaseGenericPolymorphicInlineFormSet`
When needed, the base class can be overwritten and provided to the factory via the ``formset``
parameter.
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