Use MongoClient or MongoReplicaSet client instead of Connection

Author: r4fek

django_mongodb_engine/base.py

@@ -2,14 +2,16 @@
 import datetime
 import decimal
 import sys
+import warnings
 
 from django.conf import settings
 from django.core.exceptions import ImproperlyConfigured
 from django.db.backends.signals import connection_created
 from django.db.utils import DatabaseError
 
 from pymongo.collection import Collection
-from pymongo.connection import Connection
+from pymongo.mongo_client import MongoClient
+from pymongo.mongo_replica_set_client import MongoReplicaSetClient
 
 # handle pymongo backward compatibility
 try:
@@ -226,7 +228,19 @@ def pop(name, default=None):
         for key in options.iterkeys():
             options[key.lower()] = options.pop(key)
 
-        try:
+        read_preference = options.get('read_preference')
+        if not read_preference:
+            read_preference = options.get('slave_okay', options.get('slaveok'))
+            if read_preference:
+                warnings.warn("slave_okay has been deprecated. "
+                        "Please use read_preference instead.")
+
+        if read_preference:
+            Connection = MongoReplicaSetClient
+        else:
+            Connection = MongoClient
+
+       try:
             self.connection = Connection(host=host, port=port, **options)
             self.database = self.connection[db_name]
         except TypeError: