Way too long to figure out how to add post data in $resource in angularjs

app.js

angular.module('Ionicgram', ['ionic', 'Ionicgram.controllers', 'Ionicgram.services'])

    .run(['$ionicPlatform', '$rootScope', '$state', 'UserService', function ($ionicPlatform, $rootScope, $state, UserService) {

        $ionicPlatform.ready(function () {

            UserService.login({
                login: "admin",
                password: "admin_password"
            },function(_result){
                console.log("_result " + JSON.stringify(_result));
                alert(_result.username);
            }, function(_error){
                console.log("_error " + JSON.stringify(_error));
                alert(JSON.stringify(_error));
            });

            if (window.StatusBar) {
                StatusBar.styleDefault();
            }
        });
    }])

services.js

angular.module('Ionicgram.services', ['ngResource'])
    .factory('UserService', ['User', '$resource', function (User, $resource) {
        var currentUser = null;
        var acs_api_key_development = "YOUR-API-KEY";

        var service = $resource('https://api.cloud.appcelerator.com/v1/users/:action', {},
            {
                login: {
                    // POST BODY DATA
                    login: '@login',
                    password: '@password',
                    // URL PARAMETERS
                    params: {
                        action: 'login.json',         
                        key: acs_api_key_development
                    },
                    method: "POST",
                    isArray: false,
                    transformResponse : function(data,headers) {
                        return (data && User.build(JSON.parse(data).response.users[0]));
                    }
                }
            });


        return service;
    }])

If someone knows where this is clearly documented please let me know because I was googling around for hours to find a viable solution that worked