Python 复杂查询

Question

我有以下模型:

class Restaurant(models.Model):
    name = models.CharField(max_length=100)


class UserPreference(models.Model):
    user = models.OneToOneField(User, on_delete=CASCADE)
    fruit = models.MantToManyField(Fruit)
    vegetable = models.MantToManyField(Vegetable)

class RestaurantPreference(models.Model):
    restaurant = models.OneToOneField(Restaurant, on_delete=CASCADE)
    fruit = models.MantToManyField(Fruit)
    vegetable = models.MantToManyField(Vegetable)

我如何使用首选项表在餐厅模型中查询

例如，我需要获得对特定用户具有相同偏好的餐厅？

请有想法的人帮帮我

非常感谢

Answer 1

如果您通过查询用户来获取用户偏好，您将获得相应的用户偏好，查询就像

user_preference = UserPreference.objects.get(user=user)
fruits = user_preference.fruit.all() # user's fruit preferences
vegetables = user_preference.vegetable.all() # user's vegetable preferences

现在你得到了用户所有的水果和蔬菜偏好。由此，您可以使用 django ORM 查询餐厅偏好

restaurant_preferences = RestaurantPreference.objects.filter(fruit__in=fruits, vegetable__in=vegetables)