#12203: ManyToManyField with through model can't be used in admin
-------------------------------------+-------------------------------------
Reporter: David Gouldin | Owner: Rosana
| Rufer
Type: Bug | Status: assigned
Component: contrib.admin | Version: dev
Severity: Normal | Resolution:
Keywords: M2M, admin, | Triage Stage: Accepted
through, through_fields |
Has patch: 1 | Needs documentation: 1
Needs tests: 1 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 0
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Comment (by hyperstown):
Replying to [comment:22 Dmitry Mugtasimov]:
> For some reason I ended up with this code:
>
> {{{
> class JobTitleAdmin(admin.ModelAdmin):
> def formfield_for_manytomany(self, *args, **kwargs): # pylint:
disable=arguments-differ
> # TODO(dmu) MEDIUM: Remove `auto_created = True` after these
issues are fixed:
> # https://code.djangoproject.com/ticket/12203
and
> # https://github.com/django/django/pull/10829
>
> # We trick Django here to avoid `./manage.py makemigrations`
produce unneeded migrations
> JobTitleExperienceThrough._meta.auto_created = True # pylint:
disable=protected-access
> return super().formfield_for_manytomany(*args, **kwargs)
>
>
> class JobTitle(models.Model):
> name = models.CharField(max_length=64)
> role = models.ForeignKey('JobRole', on_delete=models.CASCADE,
> related_name='titles')
> experiences = models.ManyToManyField('Experience',
through='JobTitleExperienceThrough',
> related_name='titles',
blank=True)
>
> class Meta:
> ordering = ('id',)
> }}}
I tried this solution for modified User and Group and Permission but it
didn't work so I ended up with something like this:
{{{
class UserAdmin(BaseUserAdmin):
def check(self, **kwargs):
class ThroughModelAdminChecks(self.checks_class):
def _check_field_spec_item(self, obj, field_name, label):
# TODO(dmu) MEDIUM: Remove `auto_created = True` after
these issues are fixed:
#
https://code.djangoproject.com/ticket/12203 and
#
https://github.com/django/django/pull/18612
User.user_permissions.through._meta.auto_created = True #
pylint: disable=protected-access
User.groups.through._meta.auto_created = True # pylint:
disable=protected-access
return super()._check_field_spec_item(obj, field_name,
label)
return ThroughModelAdminChecks().check(self, **kwargs)
class User(AbstractUser):
groups = models.ManyToManyField(
Group,
through=GroupPermission,
verbose_name=_("groups"),
blank=True,
help_text=_(
"The groups this user belongs to. A user will get all
permissions "
"granted to each of their groups."
),
related_name="user_set",
related_query_name="user",
)
user_permissions = models.ManyToManyField(
Permission,
through=UserPermission,
verbose_name=_("user permissions"),
blank=True,
help_text=_("Specific permissions for this user."),
related_name="user_set",
related_query_name="user",
)
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/12203#comment:28>
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