+from django.conf import settings
+
+default_pagination = getattr(settings, 'DEFAULT_PAGINATION', 20)
+
+class PaginationRegistrar(object):
+ _registry = {}
+
+ def register(self, model, pagination=None):
+ self._registry[model] = pagination or default_pagination
+
+ def unregister(self, model):
+ try:
+ del self._registry[model]
+ except KeyError:
+ return
+
+ def get_for_model(self, model):
+ if model in self._registry:
+ return self._registry[model]
+ return None
+
+def get_registry():
+ registry = getattr(settings, '_pagination_registry', None)
+ if registry is None:
+ registry = PaginationRegistrar()
+ setattr(settings, '_pagination_registry', registry)
+ return registry
\ No newline at end of file