python - 如何从 Django 中的另一个模型中选择所有外键对象？

Question

对不起标题，我不知道如何表达自己。

比如我有这三个模型:

class Person(models.Model):
    name = models.CharField()

class Teacher(models.Model):
    person = models.ForeignKey(Person)
    subject = models.CharField()

class Student(models.Model):
    person = models.ForeignKey(Person)
    grade = models.CharField()

如何选择所有Teachers的Person模型？

Answer 1

Person.objects.filter(teacher__isnull=False) 
# return Person who has a teacher pointing to it