Django ORM-筛选器相关对象

Question

I apologize if this is a duplicate, but I was unable to find any other SO posts that address this matter. I have models like so:

class Person(models.Model):
    pass

class Interest(models.Model):
    person = models.ForeignKey(Person, related_name='interests')
    is_cool = models.BooleanField()

I know that I can find all people who have cool interests like so:

Person.objects.filter(interests__is_cool=True)

However, what I really want is to get only their cool interests when I get the Person object. I know that I could always pluck the related queryset out and operate on it, like so:

interests = person.interests.filter(is_cool=True)

but I cannot assign it back to the person instance since the relationship is reversed. To summarize, the goal is to use the ORM directly to filter the Interest objects being returned in the person.interests queryset.

Answer 1

One possibility is to define a method or property on the model:

def cool_interests(self):
    return self.interests.filter(is_cool=True)