Modeling in Angular

(function () {
    'use strict';

    angular
        .module('login')
        .service('LoginModel', getInstance);

    LoginModel.$inject = ['$http'];

    function getInstance($http) {
        return LoginModel;
    }

    function LoginModel(data) {
        var model = {
            firstName: '',
            lastName: '',
            middleName: '',
            username: '',
            password: '',
            emailAddress: '',
            confirmEmail: '',
            country: '',
            isExistingUser: false
        };

        angular.extend(this, model, data || {});
    }

    LoginModel.prototype.getServerMapping = function () {
        return {
            FirstName: this.firstName,
            LastName: this.lastName,
            MiddleName: this.middleName,
            Username: this.username,
            Password: this.password,
            EmailAddress: this.emailAddress,
            ConfirmEmail: this.confirmEmail,
            Country: this.country,
            IsExistingUser: this.isExistingUser
        };
    };
})();