gistfile1.txt

- (void)purchaseBook:(ZOBook*)aBook
{
    NSDictionary * params = @{ @"book_id" : aBook.serverId };
    ZORequestExecutor * request = [ [ZORequestExecutor sharedFactory ] executorWithDelegate: self
                                                                                   resource: [NSString stringWithFormat: @"%@/%@/purchase", self.resourcePath, aBook.serverId]
                                                                                     params: nil ];
    [ request post ];
}