Send a MongoDB doc to clients anytime it changes?

Question

I want send a Mongo doc to users anytime it changes. Basically what I need is to listen for change events and then when a document is changed it gets passed it into a function that broadcasts to the correct people.

Can I listen for change events somehow? Is there a better DB to do this type of thing?

Thanks!

http://stackoverflow.com/questions/9691316/how-to-listen-for-changes-to-a-mongodb-collection — Didier Spezia, Apr 19 '12 at 09:50

Sergio Tulentsev · Answer 1 · 2012-04-19T10:35:45.987

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SERVER-124 may be implemented someday. In the meantime, you can hook into a replication process. Basically, you should do what legitimate replication clients do: tail the local.oplog collection. It contains all data modifications, you filter them, pick only interesting and broadcast to clients.

See here: http://www.mongodb.org/display/DOCS/Replication+Internals

edited Apr 19 '12 at 10:35

answered Apr 19 '12 at 09:51

Sergio Tulentsev

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score 1 · Answer 2 · answered Apr 19 '12 at 09:46

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It's a planned feature. Vote for it here https://jira.mongodb.org/browse/SERVER-124

answered Apr 19 '12 at 09:46

geakie

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score 0 · Answer 3 · answered May 05 '14 at 18:17

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You might be interested in mongo-oplog, which implements this in NodeJS by exploiting MongoDB's replication system.

answered May 05 '14 at 18:17

Eric Martindale

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Send a MongoDB doc to clients anytime it changes?

3 Answers3