from django.db import models

class Foo(models.Model):

    name = models.CharField(max_length=50)

    friend = models.CharField(max_length=50, blank=True)

class Bar(models.Model):

    name = models.CharField(max_length=50)

    normal = models.ForeignKey(Foo, models.CASCADE, related_name="normal_foo")

    fwd = models.ForeignKey("Whiz", models.CASCADE)

    back = models.ForeignKey("Foo", models.CASCADE)

class Whiz(models.Model):

    name = models.CharField(max_length=50)

class Child(models.Model):

    parent = models.OneToOneField("Base", models.CASCADE)

    name = models.CharField(max_length=50)

class Base(models.Model):

    name = models.CharField(max_length=50)

class Article(models.Model):

    name = models.CharField(max_length=50)

    text = models.TextField()

    submitted_from = models.GenericIPAddressField(blank=True, null=True)