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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');
Minimise