fireball-db/lib/update_builder.js

a lightweight model wrapper for DynamoDB

module.exports = {
  patch: function(changes) {
    var name, names, parts, set_exp, value, values;
    set_exp = 'set';
    names = {};
    values = {};
    parts = [];
    for (name in changes) {
      value = changes[name];
      parts.push("#" + name + " = :" + name);
      names["#" + name] = name;
      values[":" + name] = value;
    }
    return {
      update: set_exp + " " + (parts.join(', ')),
      names: names,
      values: values
    };
  }
};