Added an iterator method to the DjangoCassandraQuerySet class. Also added a check in the order_by method of the DjangoCassandraQuerySet class so instead of an exception, a warning is thrown when a the order_by method is called with django expressions instead of str column names. These two changes all me use use django-cassandra-engine with django-elasticsearch-dsl relatively seemlessly. (#137)

Author: ammurdoch

django_cassandra_engine/models/__init__.py

@@ -750,6 +750,9 @@ def order_by(self, *colnames):
  conditions = []
  for col in colnames:
  try:
+ if hasattr(col, 'resolve_expression'):
+ warnings.warn('Sorting by Django DB Expressions is not supported')
+ continue
  conditions.append('"{0}" {1}'.format(
  *self._get_ordering_condition(col))
  )
@@ -790,6 +793,9 @@ def values_list(self, *fields, **kwargs):
 
  def _clone(self):
  return copy.deepcopy(self)
+ 
+ def iterator(self, *args, **kwargs):
+ return super(query.ModelQuerySet, self).all()
 
 
 class DjangoCassandraModel(