Custom Error Messages with Mongoose

Question

So according to the mongoose docs, you are supposed to be able to set a custom error message in the schema like so:

 var breakfastSchema = new Schema({
  eggs: {         


        

Answer 1

Thanks for all answers, I've figured out my problem.

My schema is like that.

var User = new Schema({
  username: {type: String, required: [true, "Username is required"], unique: true},
  email: {type: String, required: [true, "Email is required"], unique: true},
  password: {type: String, required: true, unique: false},
});

I recommend to use like a function.

You can use like this;

User.post("save", function (error, doc, next) {

  if (error.keyValue.email != null && error.name === "MongoError" && error.code === 11000) {

    console.log("Email must be unique");
  } else if (error.keyValue.username != null && error.name === "MongoError" && error.code === 11000) {
    console.log("Username must be unique");
  } else {
    console.log("not found any idea, search for another reasons");
  }
});

Answer 2

you can add a custom async validator. for example:

 {
      validator: (value) => {
        return UserModel.findOne({ email: value })
          .then(user => Promise.resolve(user == null))
          .catch(error => Promise.reject(false));
      },
      message: "User with this email already exists"
 }