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，这是我创建的用于生成虚拟数据的工厂：

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)

除了 voucher_member_roles table 根据 Voucher 模型中的多对多关系创建的数据外，数据已成功填充。我希望这个 table 也被填充。

我错过了什么？

Answer 1

制作凭证工厂时需要传入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，不会创建组绑定。但是当调用 UserFactory.create(groups=(group1, group2, group3)) 时，组声明会将传入的组添加到用户的组集中。

Answer 2

如果要在工厂内生成依赖项，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())

无法针对 ManyToManyField 填充虚拟数据

Cannot populate dummy data against ManyToManyField

python

django

faker

factory-boy