#37147: Empty form for inlines breaks when using db_default on primary key field
-------------------------------------+-------------------------------------
Reporter: Mariusz | Owner: Mariusz Felisiak
Felisiak |
Type: Bug | Status: assigned
Component: Forms | Version: 6.0
Severity: Normal | Keywords:
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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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="<django.db.models.expressions.DatabaseDefault object at
0x750a2aa14ad0>" 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.']}]
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/37147>
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