相关疑难解决方法(0)

我正在使用Mongoose Library通过node.js访问MongoDB

有没有办法从文档中删除密钥？即不只是将值设置为null,但删除它？

User.findOne({}, function(err, user){
  //correctly sets the key to null... but it's still present in the document
  user.key_to_delete = null;

  // doesn't seem to have any effect
  delete user.key_to_delete;

  user.save();
});