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How to decree like $ dec?

The Meteor leaderboard example has this line:

  Players.update(Session.get("selected_player"), {$inc: {score: 5}});

How can I gracefully shrink one field? Sorry, no $ dec.

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3 answers


Increase by -1?



$inc: {score: -1}
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From MongoDB docs (linked to Meteor docs): The $ inc update operator takes both positive and negative values. A negative value effectively decreases the specified field.



http://docs.mongodb.org/manual/reference/operator/update/inc/

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Js

db.test.update({id: "zxf"}, {$inc: {intValue: NumberInt(-1)}});

Java

Update update = new Update().inc(field, -1);

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