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Type:
Bug
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Resolution: Done
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Priority:
Major - P3
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Affects Version/s: 3.0
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Component/s: None
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Environment:mongodb 2.4.9, Ubuntu 14.04, pymongo 3.0rc0
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collection.find() fails when the filter dict is a defaultdict. find() adds a new key of "_id" which causes the filter to never match. This worked with pymongo 2.8.
Sample session with pymongo 3.0rc0. The filter is a defaultdict(dict) and after the find fails you can see the filter has had '_id': {} added to it.
>>> from collections import defaultdict >>> import pymongo >>> pymongo.version '3.0rc0' >>> db = pymongo.MongoClient().test >>> db.test.insert({"foo": "bar"}) ObjectId('5515994451c3560ed8deb8fc') >>> q = {"foo": "bar"} >>> next(db.test.find(q), "NOTFOUND") {u'_id': ObjectId('5515994451c3560ed8deb8fc'), u'foo': u'bar'} >>> d = defaultdict(dict) >>> d.update(q) >>> next(db.test.find(d), "NOTFOUND") 'NOTFOUND' >>> d defaultdict(<type 'dict'>, {'foo': 'bar', '_id': {}})
A similar session with pymongo 2.8 works:
>>> from collections import defaultdict >>> import pymongo >>> pymongo.version '2.8' >>> db = pymongo.MongoClient().test >>> db.test.insert({"foo": "bar"}) ObjectId('55159b3651c3560f70111125') >>> q = {"foo": "bar"} >>> next(db.test.find(q), "NOTFOUND") {u'_id': ObjectId('55159b3651c3560f70111125'), u'foo': u'bar'} >>> d = defaultdict(dict) >>> d.update(q) >>> next(db.test.find(d), "NOTFOUND") {u'_id': ObjectId('55159b3651c3560f70111125'), u'foo': u'bar'} >>> d defaultdict(<type 'dict'>, {'foo': 'bar'})