OneToOneField reference does not document the "reverse" name

[bjb@…]

​https://docs.djangoproject.com/en/dev/ref/models/fields/#onetoonefield

Says OneToOneField is like ForeignKey, and does not name the reverse attribute.

ForeignKey states that the reverse attribute is called <othermodel>_set and can refer to multiple models. The OneToOneField documentation says the reverse attribute returns a single object, but doesn't say what the reverse name is (surely not <othermodel>_set? - but if not that, then what?)

This is true for 1.5 and dev documentation - probably true for other versions as well.

It would also be nice it if explicitly stated that an instance of the other model can exist without having an instance of the model that refers to it with OneToOneField. Eg, if you have:

Place

Restaurant

place = OneToOneField (Place)

Then you can have a place record without a Restaurant record, but you cannot have a Restaurant record without a Place record. This is alluded to in the Place/Restaurant example elsewhere ​https://docs.djangoproject.com/en/dev/topics/db/examples/one_to_one/, but could be stated in the OneToOneField documentation.

This may be related to #10227. But until any change are implemented, I'm for documenting the actual behaviour.

[Tim Graham]

The reverse attribute is just <othermodel> (lowercased). We can also mention the name can be customized with related_name (just like ForeignKey).

[Simon Charette]

#21216 is fixing an issue with hidden OneToOneField reverse descriptor that should unify related_name across all related fields.

[Tim Graham]

​PR (needs some improvements).

[Tim Graham <timograham@…>]

In f8632572ad84b05256423841cee6335490ba0698:

Fixed #21212 -- Documented the reverse name for OneToOneField.

Thanks bjb at credil.org for the report.

[Tim Graham <timograham@…>]

In f198abc7e4f0ac4b2d7e1aa6e860ffb2e491810a:

[1.6.x] Fixed #21212 -- Documented the reverse name for OneToOneField.

Thanks bjb at credil.org for the report.

Backport of f8632572ad from master

[Tim Graham <timograham@…>]

In 8ffa99ccb6173e6dd53a83204933d99a9a6748a3:

[1.5.x] Fixed #21212 -- Documented the reverse name for OneToOneField.

Thanks bjb at credil.org for the report.

Backport of f8632572ad from master