Patrick Patrick - 4 years ago 142
Python Question

PyMongo $inc having issues

When trying to use $inc I get a Syntax error stating that $set is wrong. My query is as follow:

mongo_db.campaign.update({'_id': str(campaign_id)}, { $inc: { 'item': 1 } }):

I've looked at the mongo documentation ( and other examples on SO but I can't find what's wrong. Any suggestions?


Answer Source

$inc isn't a valid Python identifier. You should pass it as a string, like everything else:

mongo_db.campaign.update({'_id': str(campaign_id)}, {'$inc': {'item': 1}})

The MongoDB docs you linked are the general MongoDB documentation, not PyMongo-specific; you can't copy/paste them literally and expect things to work.

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