如何使用RestKit资源路径映射和查询字符串？

Question

我正在尝试使用对象加载器从需要传递类型作为查询参数的API中获取对象，但无论我如何注册资源路径，它似乎都找不到我的映射(例如：http://example.com/api/households/:householdId/checklist_items?kind=todo)。

我正在设置这样的映射：

RKObjectMapping* mapping = [RKObjectMapping mappingForClass:[RMChecklistItem class]];
[mapping mapKeyPath:@"id" toAttribute:@"checklistItemId"];
[mapping mapKeyPath:@"kind" toAttribute:@"kind"];
[mapping mapKeyPath:@"title" toAttribute:@"title"];
[mapping mapKeyPath:@"completed" toAttribute:@"completed"];
[mapping mapKeyPath:@"abilities" toAttribute:@"abilities"];
[mapping mapKeyPath:@"comments" toRelationship:@"comments" 
        withMapping:[provider objectMappingForClass:[RMComment class]]];

使用基本路径和带有查询字符串的版本将其注册到对象映射提供程序中：

[provider addObjectMapping:mapping];
[provider setObjectMapping:mapping forResourcePathPattern:@"/api/households/:householdId/checklist_items"];
[provider setObjectMapping:mapping forResourcePathPattern:@"/api/households/:householdId/checklist_items?kind=:kind"];

但是当我尝试使用它时：

NSDictionary *params [NSDictionary dictionaryWithObject:@"todo" forKey:@"kind"];
NSString *path = [NSString stringWithFormat:@"/api/households/%i/checklist_items", householdId.intValue];
[[RKObjectManager sharedManager] loadObjectsAtResourcePath:[path stringByAppendingQueryParameters:params] usingBlock:^(RKObjectLoader *loader) {
    loader.onDidLoadObjects = ^(NSArray *objects) {
        NSLog(@"%@", objects);
    };
    loader.onDidFailWithError = ^(NSError *error) {
        NSLog(@"%@", error);
    };
    loader.onDidFailLoadWithError = ^(NSError *error) {
        NSLog(@"%@", error);
    };
}];

它进展不顺利：

2012-07-20 12:13:18.533 roommates[22399:13d03] D restkit.object_mapping:RKObjectMapper.m:336 Performing object mapping sourceObject: (
        {
        abilities =         {
            destroy = 1;
        };
        comments =         (
        );
        completed = 0;
        id = 44;
        kind = todo;
        title = "and do the dishes";
    },
        {
        abilities =         {
            destroy = 1;
        };
        comments =         (
                        {
                body = "your!";
                "created_at" = "2012-07-18T22:20:08-05:00";
                "creator_id" = 16;
                id = 70;
            }
        );
        completed = 0;
        id = 43;
        kind = todo;
        title = "pick you shit up";
    },
        {
        abilities =         {
            destroy = 1;
        };
        comments =         (
                        {
                body = "did it";
                "created_at" = "2012-07-18T22:19:56-05:00";
                "creator_id" = 16;
                id = 69;
            }
        );
        completed = 0;
        id = 40;
        kind = todo;
        title = "Pay Rent";
    }
)
 and targetObject: (null)
2012-07-20 12:13:18.539 roommates[22399:13d03] T restkit.object_mapping:RKObjectMapper.m:293 Examining keyPath 'users' for mappable content...
2012-07-20 12:13:18.539 roommates[22399:13d03] D restkit.object_mapping:RKObjectMapper.m:120 Found a collection containing only NSNull values, considering the collection unmappable...
2012-07-20 12:27:47.702 roommates[22399:13d03] D restkit.object_mapping:RKObjectMapper.m:303 Found unmappable value at keyPath: users
2012-07-20 12:27:47.705 roommates[22399:13d03] D restkit.object_mapping:RKObjectMapper.m:367 The following operations are in the queue: (
)
2012-07-20 12:27:51.065 roommates[22399:13d03] W restkit.object_mapping:RKObjectMapper.m:87 Adding mapping error: Could not find an object mapping for keyPath: ''
2012-07-20 12:27:51.066 roommates[22399:13d03] E restkit.network:RKObjectLoader.m:234 Encountered errors during mapping: Could not find an object mapping for keyPath: ''

- drewish

Answer 1

所以在调试器中观察流程时，我遇到了RKObjectMappingProvider的mappingForPatternMatchingString:context:，它调用了RKPathMatcher的matchesPath:string tokenizeQueryStrings:NO parsedArguments:nil，所以我猜这是有意设计的。对于查询参数“todo”和“shopping”，我只有两个可能的值，因此注册两者都不是不合理的。更新：我提交了一个拉取请求，将其更改为解析查询字符串中的标记：https://github.com/RestKit/RestKit/pull/871。

- drewish