RestKit 删除孤立对象规则

Question

是否可以设置类似全局规则的东西 RKbjectManager 在成功映射时删除孤立对象。

我目前正在使用RKPathMatcher 删除特定路径模式的孤儿，但似乎我错过了一些东西。

Answer 1

阅读RKManagedObjectRequestOperation 中的“Fetch Request Blocks”，它们是预先配置的 NSFetchRequests，用于从本地存储中返回给定类型的所有对象，以便 RestKit 可以找到不再在服务器响应中的孤立对象。

他们的示例块只检查机场航站楼：

RKObjectManager *manager = [RKObjectManager managerWithBaseURL:@"http://restkit.org"];
[manager addFetchRequestBlock:^NSFetchRequest *(NSURL *URL) {
    RKPathMatcher *pathMatcher = [RKPathMatcher pathMatcherWithPattern:@"/airports/:airport_id/terminals.json"];

    NSDictionary *argsDict = nil;
    BOOL match = [pathMatcher matchesPath:[URL relativePath] tokenizeQueryStrings:NO parsedArguments:&argsDict];
    NSString *airportID;
    if (match) {
        airportID = [argsDict objectForKey:@"airport_id"];
        NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"Terminal"];
        fetchRequest.predicate = [NSPredicate predicateWithFormat:@"airportID = %@", @([airportID integerValue])]; // NOTE: Coerced from string to number
        fetchRequest.sortDescriptors = @[ [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES] ];
        return fetchRequest;
    }

    return nil;
}];

但如果您的 URL 更通用，您可以设置 pathMatcher 以匹配任何模式：

RKPathMatcher *entityMatcher = [RKPathMatcher pathMatcherWithPattern:@"/tables/:entityName"];

BOOL entityMatch = (pathAndQueryString != nil) && [entityMatcher matchesPath:pathAndQueryString tokenizeQueryStrings:YES parsedArguments:&argsDict];
if (entityMatch) {
  NSString *entityName = argsDict[@"entityName"];

  NSFetchRequest *fetchRequest;
  if (entityName) {
    fetchRequest = [NSFetchRequest fetchRequestWithEntityName:entityName];
    fetchRequest.includesSubentities = NO;
  }

  return fetchRequest;
}

那么您只需要一个获取请求块来匹配您的任何实体。