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from django.db import models
class Person(models.Model):
first_name = models.CharField(max_length=20)
last_name = models.CharField(max_length=20)
friends = models.ManyToManyField("self")
system_check_run_count = 0
@classmethod
def check(cls, *args, **kwargs):
cls.system_check_run_count += 1
return super().check(**kwargs)
# A set of models that use a non-abstract inherited 'through' model.
class ThroughBase(models.Model):
person = models.ForeignKey(Person, models.CASCADE)
b = models.ForeignKey("B", models.CASCADE)
class Through(ThroughBase):
extra = models.CharField(max_length=20)
class B(models.Model):
people = models.ManyToManyField(Person, through=Through)
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