title: Issues with feeding the data tables into tables when using many to many relation
body: <p>I am developing an app which having two models, as I specified many to many relation therefore django creates 3rd table by itself to define the relation between two models but I am unable to feed the data(id's of both the table) in to this 3rd table.So anybody can tell me how can I do it</p>
  
  <p>model.py:</p>
  
  <pre><code>from django.db import models
  from django.contrib.auth.models import User
  
  class Customer(models.Model):
      user        =models.OneToOneField(User)
      birthday    =models.DateField()
      website     =models.CharField(max_length=50)
      store       =models.CharField(max_length=50)
      welcomemail =models.CharField(max_length=50)
  
      def __unicode__(self):
               return self.user
  
  class Customer_check_attributes(models.Model):
      user        =models.ManyToManyField(User)
      billing_add =models.CharField(max_length=100, blank=True , null=True)
      shipping_add    =models.CharField(max_length=100, blank=True , null=True)
      payment_method  =models.CharField(max_length=100, blank=True , null=True)
      shipping_method =models.CharField(max_length=200, blank=True , null=True)
      reward_points   =models.CharField(max_length=100, blank=True , null=True)
  </code></pre>