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
35551	Unique checks skipped when changing primary key	Csirmaz Bendegúz	nobody	"I noticed the unique checks are skipped ({{{_perform_unique_checks}}}) when an object's primary key is changed.

Given:

{{{
# models.py
class Dummy(models.Model):
    id = models.IntegerField(primary_key=True)

# admin.py
admin.site.register(Dummy)
}}}

1. Create Dummy (1), Dummy (2).
2. Change Dummy (2)'s Id field -> 1
3. No error, unique checks skipped
4. Change Dummy (1)'s Id field -> 3
5. A new Dummy (1) is created (why?)"	Bug	new	contrib.admin	dev	Normal			Csirmaz Bendegúz	Unreviewed	0	0	0	0	0	0