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fix read_preference for PyMongo 3+

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This commit is contained in:
Stefan Wojcik
2015-07-05 15:59:50 -07:00
parent a7aead5138
commit 54975de0f3
1 changed files with 10 additions and 2 deletions
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12
mongoengine/queryset/base.py
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@@ -1444,8 +1444,16 @@ class BaseQuerySet(object):
def _cursor(self):
if self._cursor_obj is None:
self._cursor_obj = self._collection.find(self._query,
**self._cursor_args)
# In PyMongo 3+, we define the read preference on a collection
# level, not a cursor level. Thus, we need to get a cloned
# collection object using `with_options` first.
if IS_PYMONGO_3 and self._read_preference is not None:
self._cursor_obj = self._collection\
.with_options(read_preference=self._read_preference)\
.find(self._query, **self._cursor_args)
else:
self._cursor_obj = self._collection.find(self._query,
**self._cursor_args)
# Apply where clauses to cursor
if self._where_clause:
where_clause = self._sub_js_fields(self._where_clause)