ngResource return success callback result by service - angularjs

Question

I have recetly began an adventure with AngularJs but idea of promises and returning asynchonous data overhelmed me.
I am trying to accomplish simple data returining via .factory method and $resource service.
Here is my $resource service returning promise
(function () {
angular.module('token')
.factory('tokenService', ['$resource', 'baseUri', tokenService]);
function tokenService($resource, baseUri) {
return $resource(baseUri + 'token', {}, {
post: {
method: 'POST',
headers: {
'Content-Type': 'application/x-www-form-urlencoded'
}
}
});
}
})();
I am using this service in another service which should returns data.
(function () {
angular.module('authorization')
.factory('authorizationService', ['$httpParamSerializer', 'tokenService', authorizationService]);
function authorizationService($httpParamSerializer, tokenService) {
return {
authorization: function(user){
var token = {};
tokenService.post({}, $httpParamSerializer({
grant_type: 'password',
username: user.login,
password: user.password,
client_id: user.clientId
}), function(response){
token = response;
console.log('authorizationResponse', response);
console.log('authorizationToken', token);
});
// .$promise.then(function(response){
// token = response;
// console.log('authorizationResponse', response);
// console.log('authorizationToken', token);
// });
console.log('finalToken', token);
return token;
}
};
}
})();
But i cannot force token variable to posses tokenService.post() result before returing.

Answer 1

First: inject $q in your authorizationService.
Try this:
authorization: function(user) {
return $q(function(resolve, reject) {
tokenService.post({}, {
grant_type: 'password',
username: user.login,
password: user.password,
client_id: user.clientId
})
.$promise
.then(function(token) {
resolve(token);
})
.catch(function(err) {
reject(err);
});
});
}
Then, in your controller, you can use:
authorizationService.authorization(user)
.then(function(token) {
// Some code here
})
.catch(function(err) {
// Handle error here
});