Removing white spaces (leading and trailing) from string value

Question

I have imported a csv file in mongo using mongoimport and I want to remove leading and trailing white spaces from my string value.

Is it possible directly in mongo t

Answer 1

Small correction to the answer from Neil for bulk operations api

it is

initializeOrderedBulkOp

not

initializeBulkOrderedOp

also you missed to

counter++;

inside the forEach, so in summary

var counter = 1;
var bulk = db.collection.initializeOrderedBulkOp();
db.collection.find({ "category": /^\s+|\s+$/ },{ "category": 1}).forEach(
    function(doc) {
        bulk.find({ "_id": doc._id }).update({
            "$set": { "category": doc.category.trim() }
        });

        if ( counter % 1000 == 0 ) {
            bulk.execute();
            counter = 1;
        }
        counter++;
    }
);

if ( counter > 1 )
    bulk.execute();

Note: I don't have enough reputation to comment, hence adding an answer