Django模型继承-仅在查询中需要父类的实例 [英] Django model inheritance - only want instances of parent class in a query

问题描述

假设我有2个模型，一个模型是另一个模型的父模型。如何在Django中查询不是餐厅的所有地方？ Place.objects.all（）将包括所有餐厅，对吗？我想从结果中排除孩子们。谢谢！

Let's say I have 2 models, one being the parent of another. How can I query all Places that aren't restaurants in Django? Place.objects.all() would include all restaurants right? I want to exclude the children from the results. Thank you!

class Place(models.Model):
    name = models.CharField(max_length=50)
    address = models.CharField(max_length=80)

class Restaurant(Place):
    serves_hot_dogs = models.BooleanField()
    serves_pizza = models.BooleanField()

推荐答案

根据文档，您可以检查是否存在小写模型名称作为属性：

According to the documentation, you can check for the existence of the lowercase model name as an attribute:

places = Place.objects.all()
not_restaurants = [p for p in places if not hasattr(p, 'restaurant')]

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