[英]IntegrityError with DateField - when creating objects with get_or_create
[英]Django IntegrityError with DateField - when creating objects with get_or_create
每当我创建具有相同日期的相同对象时,都会弹出Django的get_or_create问题,出现完整性错误。
我的模型中有以下字段。
class Cart(models.Model):
created = models.DateTimeField(
pgettext_lazy('Cart field', 'created'), auto_now_add=True)
last_status_change = models.DateTimeField(
pgettext_lazy('Cart field', 'last status change'), auto_now_add=True)
user = models.ForeignKey(
settings.AUTH_USER_MODEL, blank=True, null=True, related_name='carts',
verbose_name=pgettext_lazy('Cart field', 'user'))
email = models.EmailField(
pgettext_lazy('Cart field', 'email'), blank=True, null=True)
def add(self,hoarding, date_from, date_until):
cart_line, created = self.lines.get_or_create(
hoarding=hoarding,date_from=date_from,date_until=date_until)
class Meta:
ordering = ('-last_status_change',)
verbose_name = pgettext_lazy('Cart model', 'Cart')
verbose_name_plural = pgettext_lazy('Cart model', 'Carts')
def __str__(self):
return smart_str(self.user)
class CartLine(models.Model):
cart = models.ForeignKey(
Cart, related_name='lines',
verbose_name=pgettext_lazy('Cart line field', 'cart'))
hoarding = models.ForeignKey(
Hoarding, related_name='+',blank=True, null=True,
verbose_name=pgettext_lazy('Cart line field', 'hoarding'))
date_from = models.DateField(blank=True, null=True,
verbose_name=pgettext_lazy('Cart line field', 'from'))
date_until = models.DateField(blank=True, null=True,
verbose_name=pgettext_lazy('Cart line field', 'until'))
class Meta:
unique_together = ('cart', 'date_from', 'date_until')
verbose_name = pgettext_lazy('Cart line model', 'Cart line')
verbose_name_plural = pgettext_lazy('Cart line model', 'Cart lines')
当我尝试使用相同的起始日期和直到日期将相同的对象添加到购物车时,会出现错误:
IntegrityError at /hoardings/hoardings-demo-2-5/add/
UNIQUE constraint failed: cart_cartline.cart_id, cart_cartline.date_from, cart_cartline.date_until
创建具有相同日期的对象时, get_or_create
将返回IntegrityError。我在datefield中添加了独特功能,但遇到了相同的错误。 我使用Django 1.11和Python 2.7
我几次重设数据库,但没有帮助,db是Postgres / sqlite。
unique_together
模型中的unique_together引起完整性问题。删除该行,然后迁移。
class CartLine(models.Model):
cart = models.ForeignKey(
Cart, related_name='lines',
verbose_name=pgettext_lazy('Cart line field', 'cart'))
hoarding = models.ForeignKey(
Hoarding, related_name='+',blank=True, null=True,
verbose_name=pgettext_lazy('Cart line field', 'hoarding'))
date_from = models.DateField(blank=True, null=True,
verbose_name=pgettext_lazy('Cart line field', 'from'))
date_until = models.DateField(blank=True, null=True,
verbose_name=pgettext_lazy('Cart line field', 'until'))
class Meta:
verbose_name = pgettext_lazy('Cart line model', 'Cart line')
verbose_name_plural = pgettext_lazy('Cart line model', 'Cart lines')
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