#28210: `<orm_object>._state.adding` behaviour and model inheritance
-------------------------------------+-------------------------------------
Reporter: Ivaylo Donchev | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 1.11
(models, ORM) |
Severity: Release blocker | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Old description:
> Let's say we have the following models:
> {{{
> class User(models.Model):
> email = models.CharField(max_length=255, unique=True)
> password = models.CharField(max_length=32,
> widget=forms.PasswordInput)
>
> class Admin(User):
> pass
>
> class ThirdPartyUser(User):
> pass
> }}}
>
> Steps to reproduce:
> 1. {{{ admin = Admin.objects.create(email='ad...@admin.com') }}}
>
> This will create an Admin instance and User instance, with
> `admin.user_ptr._state.adding == True`
>
> 2. {{{ ThirdPartyUser.objects.create(user_ptr = admin.user_ptr) }}}
>
> This will raise the following error `{'email': ['User with this Email
> address already exists.'], 'id': ['User with this ID already exists.'] }`
> When the admin is created, the `admin.user_ptr._state.adding` is True,
> but admin._state.adding is False (as it is already created).
> If we set {{{ admin.user_ptr._state.adding = False }}}, step 2 is passing
> without errors.
New description:
Let's say we have the following models:
{{{
class User(models.Model):
email = models.CharField(max_length=255, unique=True)
password = models.CharField(max_length=32)
class Admin(User):
pass
class ThirdPartyUser(User):
pass
}}}
Steps to reproduce:
1. {{{ admin = Admin.objects.create(email='ad...@admin.com') }}}
This will create an Admin instance and User instance, with
`admin.user_ptr._state.adding == True`
2. {{{ ThirdPartyUser.objects.create(user_ptr = admin.user_ptr) }}}
This will raise the following error `{'email': ['User with this Email
address already exists.'], 'id': ['User with this ID already exists.'] }`
When the admin is created, the `admin.user_ptr._state.adding` is True, but
admin._state.adding is False (as it is already created).
If we set {{{ admin.user_ptr._state.adding = False }}}, step 2 is passing
without errors.
--
Comment (by Tim Graham):
I can't reproduce using the steps described in the description. How does
`ThirdPartyUser.objects.create()` raise a dictionary? Please clarify.
--
Ticket URL: <https://code.djangoproject.com/ticket/28210#comment:6>
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