Using a '.' in your key name in MongoDB (PyMongo)

Question

When I try saving a dict with a '.' in the key PyMongo throws an error (InvaildName) however I do see (on the Mongodb website) that keys can have '.''s in them. Why is it that pymongo won't let me save these docs? Is there an issue with them and Mongo?

James

You can use a SONManipulator - see example in http://stackoverflow.com/questions/8429318/how-to-use-dot-in-field-name — Ziad Sawalha, Dec 20 '13 at 08:22

score 12 · Answer 1 · answered Apr 23 '10 at 22:08

12

Where are you seeing an example of documents with "." in a key name? Those are invalid in MongoDB (hence PyMongo's restriction).

The reasoning is that we use dot notation in queries to reach inside of embedded documents.

answered Apr 23 '10 at 22:08

mdirolf

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This is no longer true in a newer MongoDB version, see the linked question above – user202729 May 30 '22 at 02:50

score 1 · Answer 2 · answered Jul 08 '10 at 12:30

1

You can use the dot in updates and finds, but not in save/insert.

answered Jul 08 '10 at 12:30

eckberg

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Using a '.' in your key name in MongoDB (PyMongo)

2 Answers2