old_contents: from djangoautoconf.auto_conf_admin_tools.admin_register import AdminRegister
  
  import models
  factory = AdminRegister()
  
  factory.register_all_model(models)
  from reversion.helpers import patch_admin
  
  patch_admin(models.BookingRequest)
  patch_admin(models.BookableResource)
  
  
  from reversion import models
  
  factory.register_all_model(models)
new_contents: from djangoautoconf.auto_conf_admin_tools.admin_register import AdminRegister
  from djangoautoconf.auto_conf_admin_tools.reversion_feature import ReversionFeature
  
  import models
  factory = AdminRegister()
  factory.add_feature(ReversionFeature())
  factory.register_all_model(models)
  
  # from reversion.helpers import patch_admin
  #
  # patch_admin(models.BookingRequest)
  # patch_admin(models.BookableResource)
  
  
  from reversion import models
  
  factory.register_all_model(models)
subject: Use new reversion feature to register to admin.