Mongoose plugin for keeping unique ObjectId ref Arrays

mongoose-unique-ref.js

module.exports = function(schema, options) {
  schema.method('addUniqueRef', function(field, item) {
    if(this[field].indexOf(item) < 0) this[field].push(item);
  });
  schema.method('removeUniqueRef', function(field, item) {
    this[field].splice(this[field].indexOf(item));
  });
};