RestKit使用setObjectMapping从核心数据中删除旧数据

Question

我已经回顾了RestKit对象映射的答案:难以使用setObjectMapping:forResourcePathPattern:withFetchRequestBlock它正在工作,但仅适用于最后一次映射.例:

RKManagedObjectMapping *audioSourcesMapping = [RKManagedObjectMapping mappingForEntityWithName:kEntityAudioSources inManagedObjectStore:objectStore];
[audioSourcesMapping mapKeyPath:@"icon" toAttribute:@"icon"];
[audioSourcesMapping mapKeyPath:@"name" toAttribute:@"name"];
[audioSourcesMapping mapKeyPath:@"notes" toAttribute:@"notes"];
[audioSourcesMapping mapKeyPath:@"section" toAttribute:@"section"];
[audioSourcesMapping mapKeyPath:@"url" toAttribute:@"url"];
audioSourcesMapping.primaryKeyAttribute = @"name";
[wsiObjectManager.mappingProvider registerMapping:audioSourcesMapping withRootKeyPath:@"winSystem.winSystemAudioSources.winSystemAudioSource"];


[wsiObjectManager.mappingProvider setObjectMapping:audioSourcesMapping forResourcePathPattern:kWinSystemInfoXml 
                             withFetchRequestBlock:^NSFetchRequest *(NSString *resourcePath) {
                                 return [AudioSources fetchRequest];
                             }];


RKManagedObjectMapping *eventsMapping = [RKManagedObjectMapping mappingForEntityWithName:kEntityEvents inManagedObjectStore:objectStore];
[eventsMapping mapKeyPath:@"contact" toAttribute:@"contact"];
[eventsMapping mapKeyPath:@"startDate" toAttribute:@"startDate"];
[eventsMapping mapKeyPath:@"endDate" toAttribute:@"endDate"];
[eventsMapping mapKeyPath:@"icon" toAttribute:@"icon"];
[eventsMapping mapKeyPath:@"location" toAttribute:@"location"];
[eventsMapping mapKeyPath:@"name" toAttribute:@"name"];
[eventsMapping mapKeyPath:@"notes" toAttribute:@"notes"];
[eventsMapping mapKeyPath:@"section" toAttribute:@"section"];
[eventsMapping mapKeyPath:@"url" toAttribute:@"url"];
eventsMapping.primaryKeyAttribute = @"name";
[wsiObjectManager.mappingProvider registerMapping:eventsMapping withRootKeyPath:@"winSystem.winSystemEvents.winSystemEvent"];    


[wsiObjectManager.mappingProvider setObjectMapping:eventsMapping forResourcePathPattern:kWinSystemInfoXml 
                             withFetchRequestBlock:^NSFetchRequest *(NSString *resourcePath) {
                                 return [Events fetchRequest];
                             }];

所有的映射都很有效.更新源xml时,将创建新记录.当我删除a时Event,它会被删除.当我删除AudioSource它时,它不会被删除.

如果我删除第二个setObjectMapping:forResourcePathPattern:withFetchRequestBlock然后AudioSource删除正确,但删除Event不是.我在这个xml文件中有4个映射.

这就像是对setObjectMapping:forResourcePathPattern:withFetchRequestBlock胜利的最后一次召唤.

我的解决方法是使用setObjectMapping:forResourcePathPattern:withFetchRequestBlock最常更改的映射(在本例中为Events),并添加一个使缓存无效,清空数据库和更新的按钮.我必须要有一些简单的东西.

Xcode:4.3.3 RestKit:0.10.1

示例xml文件.这一切都很好,但只使用最后一个从核心数据中删除映射setObjectMapping:forResourcePathPattern:withFetchRequestBlock

    <?xml version="1.0" encoding="UTF-8"?>
    <winSystem>
        <winSystemAudioSources>
            <winSystemAudioSource
                icon="audio.png"
                name="Hub Audio"
                notes="Cleaner Sound. Audio is delayed by about 30 seconds. This is a great way to see if you are making into the WIN System."
                section=" WIN System"
                url="http://stream.winsystem.org:443/2560.mp3" />
        </winSystemAudioSources>
        <winSystemEvents>
            <winSystemEvent
                contact=""
                endDate=""
                icon="net.png"
                location="WIN System reflector 9100"
                name="Insomniac Trivia Net"
                notes="Every Night @ 23:00 PT - WIN System reflector 9100. Join the Yahoo! group: http://groups.yahoo.com/group/insomniac-net/join"
                section="Ham Nets"
                startDate=""
                url="http://www.thedeanfamily.com/WinSystem/InsomniacNet.htm" />
        </winSystemEvents>
        <winSystemLinks>
            <winSystemLink
                icon="winsystem.png"
                name=" WIN System Home Page"
                notes="The WIN System Home Page"
                section=" WIN System"
                type="web"
                url="http://www.winsystem.org/" />
        </winSystemLinks>
        <winSystemRepeaters>
            <winSystemRepeater
                callSign="K6JSI"
                freqOffsetPl="448.800* (-) 100.0"
                grouping="winsystem"
                latitudeDefault=""
                locationElevation="Shorty's house, 560' + 53'"
                longitudeDefault=""
                node="A 01330"
                repeaterId="1"
                serviceArea="Vista"
                serviceState="CA" />
        </winSystemRepeaters>
    </winSystem>

Answer 1

我以前没有使用过托管对象，但这里要做的第一件事是激活对象映射、网络请求和核心数据上的 Restkit 日志，这样您就可以检查 RestKit 从服务器获取的内容、映射如何工作以及如何进行从 CD 获取内容，因此请尝试以下操作：

//This can be added in your app delegate
RKLogConfigureByName("RestKit/Network", RKLogLevelTrace);
RKLogConfigureByName("RestKit/ObjectMapping", RKLogLevelTrace);
RKLogConfigureByName("RestKit/CoreData", RKLogLevelTrace);

查看您的代码，您对此处的两个映射使用相同的路径：

// forResourcePathPattern:kWinSystemInfoXml
[wsiObjectManager.mappingProvider setObjectMapping:audioSourcesMapping forResourcePathPattern:kWinSystemInfoXml 
                         withFetchRequestBlock:^NSFetchRequest *(NSString *resourcePath) {
                             return [AudioSources fetchRequest];
                         }];

// forResourcePathPattern:kWinSystemInfoXml
[wsiObjectManager.mappingProvider setObjectMapping:eventsMapping forResourcePathPattern:kWinSystemInfoXml 
                         withFetchRequestBlock:^NSFetchRequest *(NSString *resourcePath) {
                             return [Events fetchRequest];
                         }];

我认为这可能会导致冲突，因为 RK 选择将两个资源之一映射到该路径，因此您应该：

1. 调试 Core Data 正在做什么。
2. 尝试使用关键路径方法的映射而不是资源路径模式，这样 RK 就不会混乱，您需要定义不同的方法来映射每种对象，现在我认为第一个正在被覆盖。

如果这不起作用，您应该发布如何删除代码中的内容，也许发布视图控制器中的所有代码。可能发生的情况是调用被您的代码覆盖在某个地方。你使用块吗？

希望有帮助！