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Third-party applications support
================================
Django-reversion support
------------------------
`Django-reversion <https://github.com/etianen/django-reversion>`_ works as
expected with polymorphic models. However, they require more setup than
standard models. We have to face these problems:
* The children models are not registered in the admin site.
You will therefore need to manually register them to django-reversion.
* Polymorphic models use
`multi-table inheritance <https://docs.djangoproject.com/en/dev/topics/db/models/#multi-table-inheritance>`_.
The django-reversion wiki explains
`how to deal with this <https://github.com/etianen/django-reversion/wiki/Low-level-API#multi-table-inheritance>`_.
Example
.......
The admin :ref:`admin-example` becomes:
.. code-block:: python
from django.contrib import admin
from polymorphic.admin import PolymorphicParentModelAdmin, PolymorphicChildModelAdmin
import reversion
from reversion import VersionAdmin
from .models import ModelA, ModelB, ModelC
class ModelAChildAdmin(PolymorphicChildModelAdmin):
base_model = ModelA
base_form = ...
base_fieldsets = (
...
)
class ModelBAdmin(VersionAdmin, ModelAChildAdmin):
# define custom features here
class ModelCAdmin(ModelBAdmin):
# define custom features here
class ModelAParentAdmin(VersionAdmin, PolymorphicParentModelAdmin):
base_model = ModelA
child_models = (
(ModelB, ModelBAdmin),
(ModelC, ModelCAdmin),
)
reversion.register(ModelB, follow=['modela_ptr'])
reversion.register(ModelC, follow=['modelb_ptr'])
admin.site.register(ModelA, ModelAParentAdmin)
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