#31394: Impossible to create with an inverse one-to-one relationship
-------------------------------------+-------------------------------------
Reporter: scwall | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 2.2
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Description changed by scwall:
Old description:
> Hello, I don't know if this is a bug or if it's something wanted. If I
> create two models .
>
> **Work >>>**
>
> Application One:
>
> ----
>
> {{{
> class Foo(models.Model):
>
> foo_bar = models.IntegerField()
>
> def save(self, *args, **kwargs):
> created = self._state.adding
> super(EqoLevel, self).save(*args, **kwargs)
> if created:
> self.bar_set.create()
>
> }}}
>
> ----
>
> Application Two:
>
> ----
>
> {{{
> class Bar(models.Model):
>
> foo = models.ForeignKey("app1.Foo",
> on_delete=CASCADE,primary_key=True)
> foo_bar_2 = models.IntegerField()
>
> }}}
>
> **Not work >>>**
>
> Application One:
>
> ----
>
> {{{
> class Foo(models.Model):
>
> foo_bar = models.IntegerField()
>
> def save(self, *args, **kwargs):
> created = self._state.adding
> super(EqoLevel, self).save(*args, **kwargs)
> if created:
> self.bar_set.create()
>
> }}}
>
> ----
>
> Application Two:
>
> ----
>
> {{{
> class Bar(models.Model):
>
> foo = models.OneToOneField("app1.Foo", on_delete=CASCADE)
> foo_bar_2 = models.IntegerField()
>
> }}}
>
> But if I use a I can't run a one to one creation with an inverse
> relationship and yet during makemigrations it says (HINT:
> ForeignKey(unique=True) is usually better served by a OneToOneField.),
>
> Yes but without this function I can't find it. I can also use a signal
> but I find it a shame to have to create a signal for the simple creation
> of a one to one relationship that foreign key can provide.
> Thank's
New description:
Hello, I don't know if this is a bug or if it's something wanted. If I
create two models .
**Work >>>**
Application One:
----
{{{
class Foo(models.Model):
foo_bar = models.IntegerField()
def save(self, *args, **kwargs):
created = self._state.adding
super(EqoLevel, self).save(*args, **kwargs)
if created:
self.bar_set.create()
}}}
----
Application Two:
----
{{{
class Bar(models.Model):
foo = models.ForeignKey("app1.Foo",
on_delete=CASCADE,primary_key=True)
foo_bar_2 = models.IntegerField()
}}}
**Not work >>>**
Application One:
----
{{{
class Foo(models.Model):
foo_bar = models.IntegerField()
def save(self, *args, **kwargs):
created = self._state.adding
super(EqoLevel, self).save(*args, **kwargs)
if created:
self.bar_set.create()
}}}
----
Application Two:
----
{{{
class Bar(models.Model):
foo = models.OneToOneField("app1.Foo", on_delete=CASCADE)
foo_bar_2 = models.IntegerField()
}}}
But if I use a I can't run a one to one creation with an inverse
relationship and yet during makemigrations it says (fields.W342) Setting
unique=True on a ForeignKey has the same effect as using a OneToOneField.
(HINT: ForeignKey(unique=True) is usually better served by a
OneToOneField.),
Yes but without this function I can't find it. I can also use a signal but
I find it a shame to have to create a signal for the simple creation of a
one to one relationship that foreign key can provide.
Thank's
--
--
Ticket URL: <https://code.djangoproject.com/ticket/31394#comment:1>
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