class ProductPodgroups( models.Model ):
    user = models.ForeignKey(User) 
    articlers = models.ForeignKey(Article, verbose_name = u"Статья")
    name = models.CharField(max_length = 70)
    class Translation( multilingual.Translation ):
        title = models.CharField( max_length = 70 )
        tr_title = models.CharField(max_length = 80, unique = True)
    def __unicode__(self):
        return '%s_%s (%s)' % (self.id, self.title, self.name)
    class Meta:
        verbose_name_plural = u"22.Подгрупы в левом меню"

class Products( models.Model ):
    news = models.ManyToManyField(News, default="null", verbose_name=u"Новости")
    article = models.ForeignKey("ArticleProduct",  blank=True , verbose_name=u"Статья")
    brand = models.ForeignKey("Brands", blank=True , verbose_name=u"Изготовитель")
    type = models.ForeignKey("ProductsType", blank=True , verbose_name=u"Тип")
    power = models.ForeignKey("ProductsPower", blank=True , verbose_name=u"Мощность")
    article = models.ForeignKey("ArticleProduct", blank=True , verbose_name=u"Статья")
    product_podgroups = models.ManyToManyField('ProductPodgroups', blank = True)
    class Translation( multilingual.Translation ):
        title = models.CharField( max_length = 70, verbose_name=u"Титл" )
        tr_title = models.CharField( max_length = 80, verbose_name=u"Транслитерация" )
        parameters = models.TextField( verbose_name=u"Параметры" )
    def __unicode__(self):
        return ("%s_%s")%(self.id, self.title)
    class Meta:
        verbose_name_plural = u"Продукция"

 'product_podgroups' has an m2m relation with model ProductPodgroups, which has either not been installed or is abstract.

# -*- coding:utf-8 -*-
import datetime
from django.conf import settings
from django.contrib.auth.models import User, Group
from django.db import models
from django.contrib.auth import authenticate, login
from hrtest.models import *

class Profile(models.Model):
    username = models.EmailField(u'login', max_length=100, unique=True, default=0)
    is_active = models.BooleanField(u'active', default=False)
    date_joined = models.DateTimeField(u'date joined', default=datetime.datetime.now)
    usertests = models.ManyToManyField('Hrtest', blank=True, related_name='usertests')

# -*- coding:utf-8 -*-
import datetime
from django.db import models
from django.contrib.auth.models import User

class Hrtest(models.Model):
    name = models.CharField(max_length=200)
    pub_date = models.DateTimeField('date published')
    vacancy = models.ForeignKey(Vacancy)
    usertests = models.ManyToManyField('User', blank=True, related_name='usertests')

    def __unicode__(self):
        return self.name

AUTH_PROFILE_MODULE = 'account.Profile'