AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    manager.responseSerializer = [AFJSONResponseSerializer serializerWithReadingOptions:NSJSONReadingAllowFragments];
    [manager GET:url parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
        
        NSData *data = [responseObject dataUsingEncoding:NSUTF8StringEncoding];
        NSMutableArray *array = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
        
        NSMutableArray *results = [[NSMutableArray alloc] init];
        [array enumerateObjectsUsingBlock:^(NSDictionary *obj, NSUInteger idx, BOOL *stop) {
            
            Model *model = [[Model alloc] initWithDic:obj];
            [results addObject:model];
        }];
        
        if (block) {
            block(results, nil);
        }
        
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"%@", error);
    }];