from datetime import datetime

from django.contrib.auth.models import User

from django.core import management

from django.db import models

# Forward declared intermediate model

class Membership(models.Model):

    person = models.ForeignKey('Person')

    group = models.ForeignKey('Group')

    price = models.IntegerField(default=100)

    def __unicode__(self):

        return "%s is a member of %s" % (self.person.name, self.group.name)

# using custom id column to test ticket #11107

class UserMembership(models.Model):

    id = models.AutoField(db_column='usermembership_id', primary_key=True)

    user = models.ForeignKey(User)

    group = models.ForeignKey('Group')

    price = models.IntegerField(default=100)

    def __unicode__(self):

        return "%s is a user and member of %s" % (self.user.username, self.group.name)

class Person(models.Model):

    name = models.CharField(max_length=128)

    def __unicode__(self):

        return self.name

class Group(models.Model):

    name = models.CharField(max_length=128)

    # Membership object defined as a class

    members = models.ManyToManyField(Person, through=Membership)

    user_members = models.ManyToManyField(User, through='UserMembership')

    def __unicode__(self):

        return self.name

# A set of models that use an non-abstract inherited model as the 'through' model.

class A(models.Model):

    a_text = models.CharField(max_length=20)

class ThroughBase(models.Model):

    a = models.ForeignKey(A)

    b = models.ForeignKey('B')

class Through(ThroughBase):

    extra = models.CharField(max_length=20)

class B(models.Model):

    b_text = models.CharField(max_length=20)

    a_list = models.ManyToManyField(A, through=Through)