90 lines
3.1 KiB
ReStructuredText
90 lines
3.1 KiB
ReStructuredText
Third-party applications support
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================================
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django-reversion support
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------------------------
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Support for django-reversion_ works as expected with polymorphic models.
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However, they require more setup than standard models. That's become:
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* The children models are not registered in the admin site.
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You will therefore need to manually register them to django-reversion_.
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* Polymorphic models use `multi-table inheritance <https://docs.djangoproject.com/en/dev/topics/db/models/#multi-table-inheritance>`_.
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See the `reversion documentation <http://django-reversion.readthedocs.org/en/latest/api.html#multi-table-inheritance>`_
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how to deal with this by adding a ``follow`` field for the primary key.
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Example
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~~~~~~~
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The admin :ref:`admin-example` becomes:
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.. code-block:: python
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from django.contrib import admin
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from polymorphic.admin import PolymorphicParentModelAdmin, PolymorphicChildModelAdmin
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from reversion.admin import VersionAdmin
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from reversion import revisions
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from .models import ModelA, ModelB, ModelC
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class ModelAChildAdmin(PolymorphicChildModelAdmin):
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base_model = ModelA
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base_form = ...
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base_fieldsets = (
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...
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)
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class ModelBAdmin(VersionAdmin, ModelAChildAdmin):
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# define custom features here
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class ModelCAdmin(ModelBAdmin):
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# define custom features here
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class ModelAParentAdmin(VersionAdmin, PolymorphicParentModelAdmin):
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base_model = ModelA
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child_models = (
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(ModelB, ModelBAdmin),
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(ModelC, ModelCAdmin),
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)
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revisions.register(ModelB, follow=['modela_ptr'])
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revisions.register(ModelC, follow=['modelb_ptr'])
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admin.site.register(ModelA, ModelAParentAdmin)
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.. _django-reversion-compare-support:
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django-reversion-compare support
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--------------------------------
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The django-reversion-compare_ views work as expected, the admin requires a little tweak.
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In your parent admin, include the following method:
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.. code-block:: python
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def compare_view(self, request, object_id, extra_context=None):
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"""Redirect the reversion-compare view to the child admin."""
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real_admin = self._get_real_admin(object_id)
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return real_admin.compare_view(request, object_id, extra_context=extra_context)
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As the compare view resolves the the parent admin, it uses it's base model to find revisions.
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This doesn't work, since it needs to look for revisions of the child model. Using this tweak,
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the view of the actual child model is used, similar to the way the regular change and delete views are redirected.
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django-mptt support
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-------------------
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Combining polymorphic with django-mptt_ is certainly possible, but not straightforward.
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It involves combining both managers, querysets, models, meta-classes and admin classes
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using multiple inheritance.
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The django-polymorphic-tree_ package provides this out of the box.
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.. _django-reversion: https://github.com/etianen/django-reversion
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.. _django-reversion-compare: https://github.com/jedie/django-reversion-compare
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.. _django-mptt: https://github.com/django-mptt/django-mptt
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.. _django-polymorphic-tree: https://github.com/edoburu/django-polymorphic-tree
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