old_contents: 
  
  from django.db import models
  from django.conf import settings
  from django.utils.translation import ugettext_lazy as _
  
  
  DEFAULT_ICEBERG_ENV = getattr(settings, 'ICEBERG_DEFAULT_ENVIRO', "prod")
  
  class IcebergBaseModel(models.Model):
      ICEBERG_PROD, ICEBERG_SANDBOX, ICEBERG_STAGE, ICEBERG_SANDBOX_STAGE = "prod", "sandbox", "stage", "sandbox_stage"
      ENVIRONMENT_CHOICES = (
          (ICEBERG_PROD, _('Iceberg - Prod')),
          (ICEBERG_STAGE, _('Iceberg - Prod Stage')), # PreProd
          (ICEBERG_SANDBOX, _('Iceberg - Sandbox')),
          (ICEBERG_SANDBOX_STAGE, _('Iceberg - Sandbox Stage')),
      )
      environment = models.CharField(choices=ENVIRONMENT_CHOICES, default=DEFAULT_ICEBERG_ENV, max_length = 20)
      iceberg_id = models.PositiveIntegerField(blank=True, null=True)
      last_updated = models.DateTimeField(auto_now = True)
  
      API_RESOURCE_NAME = None
  
      class Meta:
          abstract = True
  
      def iceberg_sync(self, api_handler):
          """
          Sync the local object from Iceberg version
          """
          raise NotImplementedError
new_contents: 
  
  from django.db import models
  from django.conf import settings
  from django.utils.translation import ugettext_lazy as _
  
  
  DEFAULT_ICEBERG_ENV = getattr(settings, 'ICEBERG_DEFAULT_ENVIRO', "prod")
  
  class IcebergBaseModel(models.Model):
      ICEBERG_PROD, ICEBERG_SANDBOX, ICEBERG_STAGE, ICEBERG_SANDBOX_STAGE = "prod", "sandbox", "stage", "sandbox_stage"
      ENVIRONMENT_CHOICES = (
          (ICEBERG_PROD, _('Iceberg - Prod')),
          (ICEBERG_STAGE, _('Iceberg - Prod Stage')), # PreProd
          (ICEBERG_SANDBOX, _('Iceberg - Sandbox')),
          (ICEBERG_SANDBOX_STAGE, _('Iceberg - Sandbox Stage')),
      )
      environment = models.CharField(choices=ENVIRONMENT_CHOICES, default=DEFAULT_ICEBERG_ENV, max_length = 20)
      iceberg_id = models.PositiveIntegerField(blank=True, null=True)
      last_updated = models.DateTimeField(auto_now = True)
  
      API_RESOURCE_NAME = None
  
      class Meta:
          app_label = "django_iceberg"
          abstract = True
  
      def iceberg_sync(self, api_handler):
          """
          Sync the local object from Iceberg version
          """
          raise NotImplementedError
subject: Add app_name for django < 1.7 compatibility