我有一个问题作为新手,我正在寻找与Django类中继承Meta类相关的概念。以下是模型,如果有人可以帮助我,我将不胜感激。
data$Mean_Aspect <- 0
library(circular)
angles = c(200.072,204.037,198.591,193.151,192.779,187.503,198.549,196.675,199.618,191.083,187.242)
anglecir = circular(angles, type="angles", units="degrees",modulo="2pi", template='geographics')
mean(anglecir)
回溯:
class Base(models.Model):
code = AutoSlugField(_("Slug"), max_length=128, unique=True,
populate_from='name')
name = models.CharField(_("Name"), max_length=128, unique=True)
description = models.TextField(_("Description"), blank=True)
countries = models.ManyToManyField('Country',
blank=True, verbose_name=_("Countries"))
is_discounted = False
class Meta:
app_label = 'shipping'
ordering = ['name']
verbose_name = _("Shipping Method")
verbose_name_plural = _("Shipping Methods")
class OrderAndItemCharges(Base):
price_per_order = models.DecimalField(
_("Price per order"), decimal_places=2, max_digits=12,
default=D('0.00'))
price_per_item = models.DecimalField(
_("Price per item"), decimal_places=2, max_digits=12,
default=D('0.00'))
free_shipping_threshold = models.DecimalField(
_("Free Shipping"), decimal_places=2, max_digits=12, blank=True,
null=True)
class Meta(Base.Meta):
app_label = 'shipping'
verbose_name = _("Order and Item Charge")
verbose_name_plural = _("Order and Item Charges")
我已经改变了类导入行为以便完成以下操作。这可能导致了这个问题。原因是我需要简化商店仪表板应用程序的代码。所以我导入了默认的Django源来导入Django类,并改变它如下:
class OrderAndItemCharges(Base):
File "C:\Users\AliKhan\supermarekt\market\shipping\models.py", line 46, in Or
derAndItemCharges
class Meta(Base.Meta):
AttributeError: type object 'Base' has no attribute 'Meta'
Filename是loading.py,我是从Django-Oscar学到的。然而,我做了一些小改动,以满足我的需要。所以问题可能出在这里。请协助
答案 0 :(得分:20)
您应该声明您的Base
类摘要,以便将其Meta
类作为属性进行访问。
class A(models.Model):
class Meta:
app_label='yourapp'
abstract=True
class B(A):
class Meta(A.Meta):
db_table='yourtable'
相关文档:https://docs.djangoproject.com/en/1.10/topics/db/models/#meta-inheritance