How can I make a service dependent on another service value - angularjs

Question

Ok, so I have this service that is dependent on another service value that the user can change in the app interface. Something like this:
app.service('Applications', ['$resource', 'URL',
function ($resource, URL) {
var applicationsResource = $resource(URL + '/applications/:id', { id: '#id' }, {
query: {
method: 'GET',
isArray: true,
transformResponse: function(body, header) {
var response = angular.fromJson(body);
return response.data.applications;
}
}
});
var applications = applicationsResource.query(function() {
applications.current = applications[0];
});
return applications;
}
]);
app.service('Users', ['$resource', 'URL', 'Applications',
function ($resource, URL, Applications) {
return $resource(URL + '/users/:id', { id: '#id' }, {
query: {
method: 'GET',
isArray: true,
headers: {
'User': Applications.current.username,
'Pass': Applications.current.password
},
transformResponse: function(body, header) {
var response = angular.fromJson(body);
return response.data.users;
}
}
});
}
]);
Example of working controller code:
app.controller('usersController', ['$scope', '$resource', 'URL', 'Applications',
function ($scope, $resource, URL, Applications) {
$scope.users = [];
$scope.reload = function() {
$scope.loading = true;
var usersResource = $resource(URL + '/users/:id', { id: '#id' }, {
query: {
method: 'GET',
isArray: true,
headers: {
'User': Applications.current.username,
'Pass': Applications.current.password
},
transformResponse: function(body, header) {
var response = angular.fromJson(body);
return response.data.users;
}
}
});
$scope.users = usersResource.query(function() {
$scope.loading = false;
});
/*
// after injecting Users, this is what I want to do, instead of what's above
$scope.users = Users.query(function() {
$scope.userTable.reload();
$scope.loading = false;
});
*/
};
$scope.$watch('Applications.current', function (newApplication, oldApplication, scope) {
if (newApplication && newApplication !== oldApplication) {
scope.reload();
}
});
}
]);
I want to replace that usersResource with my Users service, but that's where I'm stuck now.
The issue is that no matter what I do, the Applications.current on the Users service is always null. (I only make use of this service after making sure that Applications.current is not null on the controller)
If I move the resource directly to the controller, it works, but I want to move these away from the controllers.
Any tips on how to fix or improve this?

Answer 1

You should know that $resource is async and you call Users service before actually you got response from server and populated applications.current. This a reason why Applications.current is null into Users service.
In your case I would use Uses service into Applications:
app.service('Applications', ['$resource', 'URL', 'Users',
function ($resource, URL, Users) {
var applicationsResource = $resource(URL + '/applications/:id', { id: '#id' }, {
query: {
method: 'GET',
isArray: true,
transformResponse: function(body, header) {
var response = angular.fromJson(body);
return response.data.applications;
}
}
});
var applications = applicationsResource.query(function() {
applications.current = applications[0];
// call the Users
Users.query(applications.current) /**/
return /* ... */;
});
return applications;
}
]);