gistfile1.m

    NSString *urlString = @"https://api.mongolab.com/api/1/databases/todo/collections/tasks/";
    NSURL *url = [NSURL URLWithString:urlString];
    AFHTTPClient *client = [[AFHTTPClient alloc] initWithBaseURL:url];

    NSDictionary *key = @{@"apiKey": @"MWxF-8RKg5wx4oLLDDDZa5Mdd01to7zV"};

    void (^logMessage)(RACTuple *) = ^(RACTuple * x) {
        AFHTTPRequestOperation *operation = x.first;
        NSData *data = x.second;
        NSString *message = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
        NSLog(@"path: %@,  message %@", operation.request.URL.lastPathComponent, message);
    };

    RAC(self.label, text) = [[[RACSignal
        merge:@[
            [[client rac_getPath:@"53594736e4b0ddd860afc445" parameters:key] doNext:logMessage],
            [[client rac_getPath:@"535946a7e4b0ddd860afc364" parameters:key] doNext:logMessage],
            [[client rac_getPath:@"53594606e4b094f2b232b3a2" parameters:key] doNext:logMessage],
            [[_button rac_signalForControlEvents:UIControlEventTouchUpInside] take:1],
        ]] scanWithStart:@0 combine:^id(NSNumber *count, id next) {
            return @(count.integerValue + 1);
        }] map:^NSString *(NSNumber *value) {
            return [NSString stringWithFormat:@"%@ событий получено", value];
        }];