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  • Patrick S thinks this is interesting:

In the following example, we are using respond as our callback function, and checking to see whether a user record with the supplied username already exists.

userSchema.path('username').validate(function (value, respond) {
  User.find({username: value}, function(err, users){
    if (err){
      console.log(err);
      return respond(false);
    }
    console.log('Number found: ' + users.length);
    if (users.length) {
      respond(false); // validation failed
    } else {
      respond(true); // validation passed
    }
  })
}, 'Duplicate username');

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Cover of Mongoose for Application Development

Note

check if user exists

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http://learning.oreilly.com/a/mongoose-for-application/58755/