Question

我有一个我用Mongoose查询的Mongo用户数据库。我想做findOne来确定用户是否已经存在。我希望它首先搜索用户是否已经存在电子邮件，如果用户不存在，则应搜索用户是否存在电话。这是否必须在2个单独的查询中完成，还是可以归为一个？

User.findOne({ email: req.body.email }).exec(function(err, user){

  if (user) //user already exists with email
  else //no users with that email but we haven't checked phone number yet!

});

Answer 1

为什么不使用$or运算符？

User.findOne({$or: [
    {email: req.body.email},
    {phone: req.body.phone}
]}).exec(function(err, user){
    if (user) {} //user already exists with email AND/OR phone.
    else {} //no users with that email NOR phone exist.
});

这里是伪 - SQL等价物：

SELECT * FROM users WHERE email = '%1' OR phone = '%2'

Mongoose findOne with＆＃39;要么是＆＃39;询问

1 个答案: