Validating model fields loopback

'use strict';

module.exports = function (Todos) {

  Todos.validatesLengthOf('text', {min: 5, message: {min: 'text is too short'}});

  //create a test remote method and do field validations using Validate object
  Todos.saveTodosData = function (text, done, cb) {
    Todos.create({text, done}, function (err, data) {
      cb(err, data);
    });
  };
  Todos.remoteMethod("saveTodosData", {
    accepts: [
      {
        arg: "text",
        type: "string",
        required: true
      }, {
        arg: "done",
        type: "boolean",
        required: true
      }
    ],
    returns: {
      root: true
    }
  });
};


curl -H "Content-Type: application/json" -X POST -d '{"text":"30","done":false}' http://localhost:3001/rzr/api/todos/saveTodosData