Django 查询 ManyToManyField
class UserProfile(models.Model):
user = models.ForeignKey(User, unique = True, related_name = 'user')
likes = models.ManyToManyField(Product, null = True, blank = True)
class Product(models.Model):
user = models.ForeignKey(User)
price = models.FloatField(default = 0)
我：
p1 = Product.objects.get(pk = 1)
我想计算所有 UserProfile 对象的 likes 字段中包含 p1 的次数。
如何？
class UserProfile(models.Model):
user = models.ForeignKey(User, unique = True, related_name = 'user')
likes = models.ManyToManyField(Product, null = True, blank = True)
class Product(models.Model):
user = models.ForeignKey(User)
price = models.FloatField(default = 0)
I've:
p1 = Product.objects.get(pk = 1)
I want to count how many times p1 is contained in likes field in all UserProfile objects.
How?
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假设每个配置文件只能喜欢一种产品一次。
assuming that a product can only be liked one time by each profile.