Sorry, my earlier suggestion for Institute.members is incorrect. Here's the
correct code:
def members(self):
return self.user_set.all()
For example, if foo is an institute, then foo.user_set.all() would give all
users related to that institution.
Dartos
On Friday, May 5, 2017 at 11:00:46 AM UTC-4, Dartos wrote:
>
> Hi,
>
> Have you tried breaking up the migrations into multiple steps?
>
> First create User and Institute without reference to each other. Then try
> additional migrations.
>
> Also, you can simplify Institute.members using reverse relations as
> follows:
> def members(self):
> return Institute.user_set.all()
>
> Dartos
>
> On Friday, May 5, 2017 at 8:41:52 AM UTC-4, Tobias Dacoir wrote:
>>
>> 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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