Python Django储蓄到国外
我正在尝试根据topCategory和middleCategory的外键主键保存项目 models.pyPython Django储蓄到国外,python,django,django-models,orm,Python,Django,Django Models,Orm,我正在尝试根据topCategory和middleCategory的外键主键保存项目 models.py class MiddleCategory(models.Model): title = models.CharField(max_length=50) slug = models.SlugField() def __str__(self): return self.title class TopCategory(models.Model):
class MiddleCategory(models.Model):
title = models.CharField(max_length=50)
slug = models.SlugField()
def __str__(self):
return self.title
class TopCategory(models.Model):
title = models.CharField(max_length=50)
slug = models.SlugField()
middleCategory = models.ManyToManyField(MiddleCategory)
def __str__(self):
return self.title
# Item
class Product(models.Model):
title = models.CharField(max_length=500, db_index=True)
price = models.DecimalField(max_digits=10, decimal_places=2)
brand = models.CharField(max_length=100)
# brand_id = models.IntegerField()
retailer = models.CharField(max_length=255)
image = models.CharField(max_length=1000)
url = models.URLField(max_length=800, unique=True, default='')
model_numbers = models.BigIntegerField(default=0)
description = models.CharField(max_length=500)
featured = models.CharField(max_length=255, db_index=True, default='NO')
timestamp = models.DateTimeField(auto_now=True)
topCategory = models.ForeignKey(TopCategory)
middleCategory = models.ForeignKey(MiddleCategory)
def __str__(self):
return self.title
在我的脚本中,我是这样保存的:
Product(title=title,
price=price,
brand=brand,
retailer=retailer,
image=image,
url=url,
description=description,
midCategory=midCategory,
topCategory=topCategory
).save()
这就是我得到的错误:
ValueError:无法分配“'1'”:“Product.topCategory”必须是“topCategory”实例。您可以获取topCategory的实例
instance = TopCategory.objects.get(id=topCategory)
然后
你能打印什么是topCategory吗?是的,它是一个整数“1”。我检查了TopCategory类的主键,发现有一个“1”;您需要的是TopCategory的实际实例,而不是它的主键。我也在shell中对此进行了测试。我尝试了以下方法:topCategory='Computing'&topCategory=1。两个都不起作用。这可能是因为TopCategory有一个“manytomy”字段吗?很好,这就是工作,我知道现在缺少了什么。谢谢
Product(title=title,
price=price,
brand=brand,
retailer=retailer,
image=image,
url=url,
description=description,
midCategory=midCategory,
topCategory=instance
).save()