id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
35269	GeneratedFields can't be defined on RelatedFields	Perrine L.	nobody	"It is not possible to define a GeneratedField with a ForeignKey or a ManyToManyField as an output_field.
When those RelatedFields are defined as output_field, an error is raised 

```AttributeError: 'ForeignKey' object has no attribute 'opts'``` line 190, in _check_relation_model_exists or line 494, in related_query_name (cf. https://github.com/django/django/blob/3d4fe39bac082b835a2d82b717b6ae88ea70ea15/django/db/models/fields/related.py)

At least with Postgres as a backend, there doesn't seem to be any technical impossibility to make a GeneratedField on a ForeignKey or ManyToMany fields : https://www.postgresql.org/docs/current/ddl-generated-columns.html"	New feature	closed	Database layer (models, ORM)	5.0	Normal	invalid		Perrine L.	Unreviewed	0	0	0	0	0	0