Class ReverseManyToOneDescriptor

django.db.models.fields.related_descriptors.ReverseManyToOneDescriptor

Accessor to the related objects manager on the reverse side of a many-to-one relation.

Declaration

class ReverseManyToOneDescriptor

Documentation

In the example::

    class Child(Model):
        parent = ForeignKey(Parent, related_name='children')

``Parent.children`` is a ``ReverseManyToOneDescriptor`` instance.

Most of the implementation is delegated to a dynamically defined manager
class built by ``create_forward_many_to_many_manager()`` defined below.

Methods

▶ def __get__(self, instance, cls=None)

Get the related objects through the reverse relation.

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With the example above, when getting ``parent.children``:

- ``self`` is the descriptor managing the ``children`` attribute
- ``instance`` is the ``parent`` instance
- ``cls`` is the ``Parent`` class (unused)

▶ def __init__(self, rel)
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Overrides
This method is overriden in:
- django.db.models.fields.related_descriptors.ManyToManyDescriptor
▷ def __set__(self, instance, value)
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▶ def related_manager_cls(self) @cached_property
@cached_property
def related_manager_cls(self)
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Overrides
This method is overriden in:
- django.contrib.contenttypes.fields.ReverseGenericManyToOneDescriptor
- django.db.models.fields.related_descriptors.ManyToManyDescriptor

Subclasses

Reexports

Imported in django.contrib.contenttypes.fields.
Imported in django.db.models.fields.related.

Django