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));
  });
};

Hey there!
This code is very unsafe:

• If you remove the item which was not found in this[field], your code will delete the last element in the this[field]
• If you remove the first element in the this[field] this code will DELETE WHOLE array. Check http://www.w3schools.com/jsref/jsref_splice.asp