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
37147	Empty form for inlines breaks when using db_default on primary key field	Mariusz Felisiak	Mariusz Felisiak	"Using `db_default` with the new `UUID4` or `UUID7` functions breaks saving inlines. For example,

- `models.py`
{{{#!python
class MyMain(models.Model):
    uuid = models.UUIDField(primary_key=True, db_default=UUID7(), editable=False, verbose_name=""UUID"")
    name = models.CharField(max_length=100)

class MyChild(models.Model):
    name = models.CharField(max_length=100)
    parent = models.ForeignKey(MyMain, models.DB_CASCADE)
}}}

- `admin.py`

{{{#!python
class ChildAdmin(admin.TabularInline):
    model = MyChild
    extra = 0


class MainAdmin(admin.ModelAdmin):
    inlines = [ChildAdmin]


admin.site.register(MyChild)
admin.site.register(MyMain, MainAdmin)
}}}

`DatabaseDefault` instances are rendered as values of the parent fields:

{{{
<tr class=""form-row  empty-form"" id=""mychild_set-empty"">
  <td class=""original"">      
     <input type=""hidden"" name=""mychild_set-__prefix__-id"" id=""id_mychild_set-__prefix__-id"">
     <input type=""hidden"" name=""mychild_set-__prefix__-parent"" value=""&lt;django.db.models.expressions.DatabaseDefault object at 0x750a2aa14ad0&gt;"" id=""id_mychild_set-__prefix__-parent"">
  </td>
  ...
}}}
which causes the following error when trying to save:
{{{
[{'parent': ['The inline value did not match the parent instance.']}]
}}}"	Bug	assigned	Forms	6.0	Normal				Unreviewed	0	0	0	0	0	0