Mongo shell command to add new fields to collection

mongo.js

// shell
db.casestudies.find().forEach(function (data) {db.casestudies.update({_id: data._id}, {$set: {links: [],documents: {},}})});

// pretty
db.casestudies.find().forEach(function (data) {
    db.casestudies.update({
        _id: data._id
    }, {
        $set: {
          links: [],
          documents: {},
        }
    })
});

// import database
mongorestore --db rebelware_spark_staging --verbose /var/www/spark_alpha/server/rebelware_staging_BACKUP/rebelware_staging