how to create instant of models in mdoels.py class django code example

Example 1: get_absolute_url django

def get_absolute_url(self):
  from django.core.urlresolvers import reverse
  return reverse('', kwargs={'pk': self.pk})

Example 2: str django

def __str__(self):
        return self.name

Example 3: how to get foregine kew field in models.py

items = CartItem.objects.select_related('product').filter(cart=cart)

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