Change all my documents nested document value

Question

In mongos shell how would I go through and change every document in reviews.category to \"category 2\"

My Documents Structure:

{
   \"_i         


        

Answer 1

You will have to do this yourself in your application code, by querying the document, and looping over all of your nested documents; and then save it back to MongoDB.

In order to prevent race conditions with this, please have a look at the section compare and swap at http://www.mongodb.org/display/DOCS/Atomic+Operations

There is currently an open ticket for this to add this functionality to MongoDB. You might want to up-vote it: https://jira.mongodb.org/browse/SERVER-1243