TGRTimeline.m

- (SLRequest *)requestForOldTweets
{
    TGRTweet *firstTweet = [TGRTweet firstTweetInManagedObjectContext:self.managedObjectContext];
    
    if (!firstTweet) {
        NSLog(@"requestForOldTweets shouldn't be called when the cache is empty");
        return nil;
    }
    
    NSNumber *maxIdentifier = [NSNumber numberWithLongLong:[firstTweet.identifier longLongValue] - 1];
    
    NSDictionary *parameters = @{
    @"include_rts" : @"true",
    @"max_id" : [maxIdentifier stringValue]
    };
    
    SLRequest *request = [SLRequest requestForServiceType:SLServiceTypeTwitter
                                            requestMethod:SLRequestMethodGET
                                                      URL:[NSURL URLWithString:kHomeTimelineURL]
                                               parameters:parameters];
    request.account = self.account;
    
    return request;
}