值对于类型字符Django Factory太长

Question

我有下面的OrderDataFactory类。

class OrderDataFactory(factory.django.DjangoModelFactory):
class Meta:
model = models.OrderData
order = factory.SubFactory(OrderFactory)
category = 'single',
quantity = 75.6
price_per_kg = 10.5
sku = factory.SelfAttribute('crop_data.id')
class Params:
crop_data = factory.SubFactory(CropFactory)

型号.py

class OrderData(models.Model):
CATEGORY_CHOICES = (
(SKUCategory.SINGLE, 'Single Sku'),
(SKUCategory.COMBO, 'Combo Sku'),
)
sku = models.PositiveIntegerField(null=False, validators=[MinValueValidator(1)])
order = models.ForeignKey(Order, on_delete=models.CASCADE)
quantity = models.FloatField()
price_per_kg = models.FloatField()
category = models.CharField(choices=CATEGORY_CHOICES, max_length=8)
class Meta:
unique_together = (('sku', 'order', 'category'),)

类别.py

class SKUCategory:
SINGLE = 'single'
COMBO = 'combo'

我收到以下错误。

django.db.utils.DataError：值太长，无法更改类型字符(8(

甚至类别的最大长度是6。

Answer 1

这一行的末尾有一个逗号category = 'single',。这将category定义为元组('single',)，该元组可能正在被转换为11个字符长的字符串。删除逗号以使用字符串

category = 'single'