Ndtyjky

I'm trying to create fake data for my model which is linked to the auth.User. I'm running Python 3.7 with Django 2.1 django-autofixture 0.12.1:

models.py

Class Person(models.Model):

      user = models.OneToOneField(User, on_delete=models.SET_NULL, null=True)

      about = models.CharField(max_length=200)

autofixtures.py

Class PersonGenerator(AutoFixture):

      field_values = {

        'user':InstanceGenerator(autofixture=UserFixture(User)),

        'about': LoremGenerator(max_length=200)

      }

register(Person,PersonGenerator)

Then I run the autofixtures file to register my generator

py manage.py shell

>>> exec(open('myapp/autofixtures.py').read())

>>> exit()



py manage.py loadtestdata myapp.Person:50

I've got the following error message:

  File "manage.py", line 15, in <module>

    execute_from_command_line(sys.argv)

  File "D:..envlibsite-packagesdjangocoremanagement__init__.py", line 381, in execute_from_command_line

    utility.execute()

  File "D:..envlibsite-packagesdjangocoremanagement__init__.py", line 375, in execute

    self.fetch_command(subcommand).run_from_argv(self.argv)

  File "D:..envlibsite-packagesdjangocoremanagementbase.py", line 316, in run_from_argv

    self.execute(*args, **cmd_options)

  File "D:..envlibsite-packagesdjangocoremanagementbase.py", line 353, in execute

    output = self.handle(*args, **options)

  File "c:..localprogramspythonpython37-32Libcontextlib.py", line 74, in inner

    return func(*args, **kwds)

  File "D:..envlibsite-packagesautofixturemanagementcommandsloadtestdata.py", line 225, in handle

    autofixture.create(model, count, **kwargs)



  File "D:..envlibsite-packagesautofixture__init__.py", line 136, in create

    return autofixture.create(count, **create_kwargs)

  File "D:..envlibsite-packagesautofixturebase.py", line 554, in create

    instance = self.create_one(commit=commit, **kwargs)

  File "D:..envlibsite-packagesautofixturebase.py", line 501, in create_one

    self.process_field(instance, field)

  File "D:..envlibsite-packagesautofixturebase.py", line 400, in process_field

    value = self.get_value(field)

  File "D:..envlibsite-packagesautofixturebase.py", line 396, in get_value

    value = generator()

  File "D:..envlibsite-packagesautofixturegenerators.py", line 71, in __call__

    return self.get_value()

  File "D:..envlibsite-packagesautofixturegenerators.py", line 67, in get_value

    value = self.generate()

  File "D:..envlibsite-packagesautofixturegenerators.py", line 535, in generate

    return self.autofixture.create()[0]



File "D:..envlibsite-packagesautofixturebase.py", line 554, in create

        instance = self.create_one(commit=commit, **kwargs)

File "D:..envlibsite-packagesautofixturebase.py", line 526, in create_one

        self.process_m2m(instance, field)

File "D:..envlibsite-packagesautofixturebase.py", line 413, in process_m2m

        return self.process_field(instance, field)

File "D:..envlibsite-packagesautofixturebase.py", line 403, in process_field

        setattr(instance, field.name, value)

File "D:..envlibsite-packagesdjangodbmodelsfieldsrelated_descriptors.py", line 537, in __set__

        % self._get_set_deprecation_msg_params(),





TypeError: Direct assignment to the forward side of a many-to-many set is prohibited. Use groups.set() instead.

How can it be M2M set when my relationship is one-to-one?

So Django 2 does not allow creating foreign key without saving the instance first. I switched to factory boy and use their SubFactory feature for this and it works.