无法针对ManyToManyField填充虚拟数据

Question

我正在尝试使用factoryboy在我的项目中为Django模型创建测试数据。数据是通过Faker生成的，除了一个字段，即ManyToManyField;与来自django.contrib.auth.model命名组的另一个内置模型的多对多关系。

class Voucher(models.Model):
    code = models.CharField(max_length=20, null=True, blank=True, unique=True)
    is_enabled = models.BooleanField('enable voucher', default=True, help_text='A soft delete mechanism for the voucher.')
    start_date = models.DateTimeField(null=True, blank=True)
    end_date = models.DateTimeField(null=True, blank=True)
    member_roles = models.ManyToManyField(to=Group, related_name='member_roles')

    def __str__(self):
        return "{}".format(self.code)

    class Meta:
        verbose_name = 'Voucher'
        verbose_name_plural = 'Vouchers'

这是我的模型，这是我为生成虚拟数据而创建的工厂：

class VoucherFactory(django.DjangoModelFactory):
    class Meta:
        model = 'app.Voucher'

    code = Faker('first_name')
    is_enabled = fuzzy.FuzzyChoice([True, False])
    start_date = fuzzy.FuzzyDateTime(datetime.datetime.now(pytz.utc))
    end_date = fuzzy.FuzzyDateTime(datetime.datetime.now(pytz.utc))

    @factory.post_generation
    def member_roles(self, create, extracted, **kwargs):
        if not create:
            return
        if extracted:
            for member_role in extracted:
                self.member_roles.add(member_role)

数据被成功填充，除了在voucher_member_roles模型中针对这种多对多关系创建的Voucher表。我希望这个表也可以填充。

我错过了什么？

Answer 1

您需要在制作凭证工厂时传入member_roles。例如：

VoucherFactory.create(member_roles=[member_role1, member_role2])

请参阅http://factoryboy.readthedocs.io/en/latest/recipes.html#simple-many-to-many-relationship，其中指出：

调用UserFactory（）或UserFactory.build（）时，不会创建任何组绑定。但是，当调用UserFactory.create（groups =（group1，group2，group3））时，groups声明将添加组传递给用户的组集。

Answer 2

如果要在工厂中生成依赖项，请使用：

class VoucherFactory(django.DjangoModelFactory):
    class Meta:
        model = 'app.Voucher'

    code = Faker('first_name')
    is_enabled = fuzzy.FuzzyChoice([True, False])
    start_date = fuzzy.FuzzyDateTime(datetime.datetime.now(pytz.utc))
    end_date = fuzzy.FuzzyDateTime(datetime.datetime.now(pytz.utc))

    @factory.post_generation
    def member_roles(self, create, extracted, **kwargs):
        if not create:
            return
        for _ in range(2):  # <- if you want more than one
            self.member_roles.add(GroupFactory())