corrected bad import preventing to run on PyMongo 2.X versions
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@ -13,7 +13,6 @@ from bson import json_util
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import pymongo
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import pymongo.errors
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from pymongo.common import validate_read_preference
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from pymongo.collection import ReturnDocument
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from mongoengine import signals
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from mongoengine.connection import get_db
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@ -27,6 +26,9 @@ from mongoengine.queryset import transform
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from mongoengine.queryset.field_list import QueryFieldList
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from mongoengine.queryset.visitor import Q, QNode
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if IS_PYMONGO_3:
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from pymongo.collection import ReturnDocument
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__all__ = ('BaseQuerySet', 'DO_NOTHING', 'NULLIFY', 'CASCADE', 'DENY', 'PULL')
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