Question

我已经在RestKit Object Mapping: difficulty using setObjectMapping:forResourcePathPattern:withFetchRequestBlock查看了答案并且它正在运行，但仅适用于最后一次映射。例如：

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];
                             }];

所有映射都很有效。更新源xml时，将创建新记录。当我删除Event时，它会被删除。当我删除AudioSource时，它不会被删除。

如果删除第二个setObjectMapping:forResourcePathPattern:withFetchRequestBlock，则会正确删除AudioSource，但删除的Event不会。我在这个xml文件中有4个映射。

这就像最后一次致电setObjectMapping:forResourcePathPattern:withFetchRequestBlock获胜。

我的解决方法是在最常更改的映射（在本例中为setObjectMapping:forResourcePathPattern:withFetchRequestBlock）上使用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setObjectMapping:forResourcePathPattern:withFetchRequestBlock

从核心数据中删除映射

    <?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

之前我没有使用过托管对象，但首先要做的是激活对象映射，网络请求和核心数据的restkit日志，这样你就可以检查restkit从服务器获取的内容，映射是如何工作的以及如何从CD中获取内容，请尝试以下方法：

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

查看代码，您在这里使用两个映射的相同路径：

// 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会选择其中一个资源映射到该路径，因此您应该：

调试Core Data正在做什么。
尝试使用关键路径方法的映射而不是资源路径模式，因此RK不会搞砸，你需要定义不同的方法来映射每种对象，现在我认为第一个被覆盖

如果这不起作用，您应该发布如何删除代码中的内容，或者发布视图控制器中的所有代码。可能会发生的是，调用被某些地方的代码覆盖。你在使用积木吗？。

希望有所帮助！

RestKit使用setObjectMapping从核心数据中删除旧数据

1 个答案: