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from django.db import models
class Account(models.Model):
num = models.IntegerField()
class Person(models.Model):
GENDER_CHOICES = (
("M", "Male"),
("F", "Female"),
)
name = models.CharField(max_length=20)
gender = models.CharField(max_length=1, choices=GENDER_CHOICES)
pid = models.IntegerField(null=True, default=None)
class Employee(Person):
employee_num = models.IntegerField(default=0)
profile = models.ForeignKey(
"Profile", models.SET_NULL, related_name="profiles", null=True
)
accounts = models.ManyToManyField("Account", related_name="employees", blank=True)
class NonConcreteField(models.IntegerField):
def db_type(self, connection):
return None
def get_attname_column(self):
attname, _ = super().get_attname_column()
return attname, None
class Profile(models.Model):
name = models.CharField(max_length=200)
salary = models.FloatField(default=1000.0)
non_concrete = NonConcreteField()
class ProxyEmployee(Employee):
class Meta:
proxy = True
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