javascript - mongodb type change to array

Question

I have a field in mongodb that's a string. {"field": "some text"}, I want to convert them all into arrays. {"field": ["some text"]}

I know I can just loop through all the documents, get the field, then update, but I'm wondering if there's a cleaner way.

Thanks.

Answer 1

Nitin Garg's answer above almost works, except his example converts from a string to a hash, NOT a string to an array.

Taking into account Joel Harris's comments, the proper solution would look like:

db.jobs.find( { "jobLocationCity" : { $type : 2 } } ).snapshot().forEach( function (x) {
    x.jobLocationCity = [ jobLocationCity ];
    db.jobs.save(x);
});

Or if using db.eval:

function f() {
    db.jobs.find( { "jobLocationCity" : { $type : 2 } } ).snapshot().forEach( function (x) {
        x.jobLocationCity = [ jobLocationCity ];
        db.jobs.save(x);
    });
}
db.eval(f);