"""

Using a custom primary key

By default, Django adds an ``"id"`` field to each model. But you can override

this behavior by explicitly adding ``primary_key=True`` to a field.

"""

from django.db import models

from .fields import MyAutoField, MyWrapperField

class Employee(models.Model):

    employee_code = models.IntegerField(primary_key=True, db_column="code")

    first_name = models.CharField(max_length=20)

    last_name = models.CharField(max_length=20)

    class Meta:

        ordering = ("last_name", "first_name")

    def __str__(self):

        return "%s %s" % (self.first_name, self.last_name)

class Business(models.Model):

    name = models.CharField(max_length=20, primary_key=True)

    employees = models.ManyToManyField(Employee)

    class Meta:

        verbose_name_plural = "businesses"

class Bar(models.Model):

    id = MyWrapperField(primary_key=True, db_index=True)

class Foo(models.Model):

    bar = models.ForeignKey(Bar, models.CASCADE)

class CustomAutoFieldModel(models.Model):

    id = MyAutoField(primary_key=True)