LoginViewController.m

ListingsViewModel.m

@implementation WMListingsViewModel

- (id)init {
        
        // combine bounding box and type signals and then feed through api to get current listings
        _currentListings = [[[[[RACSignal
                                combineLatest:@[allBoundingBoxSources,
                                                _currentType,
                                                combinedFilters]
                             reduce:toListingQuery]
                            throttle:0.5]
                            ignore:nil]
                            flattenMap:toFetchListings]
                            replayLast];

        RACSignal *loginAttempts = [[[RACObserve(self, loginCredentials) ignore:nil] flattenMap:^RACStream *(RACTuple *values) {
            return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
                GROAuth2SessionManager *sessionManager = [GROAuth2SessionManager
                                                            managerWithBaseURL:[NSURL URLWithString:WM_BASE_URL]
                                                            clientID:OAUTH_CLIENT_ID
                                                            secret:OAUTH_SECRET];

                [sessionManager
                    authenticateUsingOAuthWithPath:@"/oauth/token"
                    username:values[0]
                    password:values[1]
                    success:^(AFOAuthCredential *credential) {
                         NSLog(@"loginAttempt, success");
                        [subscriber sendNext:@[@"success", credential]];
                        [subscriber sendCompleted];
                    }
                    failure:^(NSError *error) {
                        [subscriber sendNext:@[@"fail", error]];
                        [subscriber sendCompleted];
                    }
                 ];

                 return [RACDisposable disposableWithBlock:^{}];
            }];
        }] replayLast];

        _loginSuccesses = [[[loginAttempts
                            filter:^BOOL(RACTuple *values) {
                                NSLog(@"loginSuccess, filter");
                                return [values[0] isEqualToString:@"success"];
                            }]
                            map:^id(RACTuple *values) {
                                NSLog(@"loginSuccess, map");
                                return values[1];
                            }] replayLast];

LoginViewController.m

@implementation WMLoginViewController

- (void)viewDidLoad {
    [self rac_liftSelector:@selector(handleSuccess:) withSignalsFromArray:@[[_viewModel.loginSuccesses take:1]]];
    [self rac_liftSelector:@selector(handleFailure:) withSignalsFromArray:@[[_viewModel.loginFailures takeUntil:_viewModel.loginSuccesses]]];
}