I am trying to build a model (in two separate apps) which has the following
constraints:
- There can be many institutes
- there can many users
- each user is a member of exactly one institute
- each institute has exactly one master user
However I am running into CircularDependency errors when trying to create
this model and database. Of course this model is a bit problematic because
you can't have an institute without master user, but also you can't create
a user without some default institute. How do I fix this? Should I be more
lean on the model side and allow for a lot of blanks and null values and
make all the exception handling somewhere else?
Please tell me how to improve my model.
>
>> class User(AbstractBaseUser, PermissionsMixin):
>
> # account-related information
> institute = models.ForeignKey(Institute, blank=True, null=True,
> on_delete=models.SET(get_default_institute))
> username = ...
> ....
>
> This is the model in another app for the institutes
>
> class Institute(models.Model):
> master_user = models.ForeignKey(settings.AUTH_USER_MODEL, related_name
> ='master_user')
> name = models.CharField(max_length=255)
>
> def members(self):
> UserModel = apps.get_model('play', 'User') # need to avoid
> circular import
> return UserModel.objects.filter(institute=self)
>
>
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