Normalize address countries to uppercase

mongo_normalize_address_countries.js

var cols = ['customers', 'sellers', 'suppliers'];
for (j in cols) {
    db[cols[j]].find({'addresses.country':/[a-z]/}).forEach(function(d){
        for (i in d.addresses) {
            d.addresses[i].country = d.addresses[i].country.toUpperCase();
        }
        db[cols[j]].save(d);
    });
}