Question

在我的应用中，我做了类似的事情：

[itineraryMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"inboundInfo" toKeyPath:@"inboundInfo" withMapping:flightInfoMapping]];

但是根据某些条件，键inboundInfo可能也可能不会返回JSON，我不想在objectManager添加一个全新的（大）响应描述符但是，为了满足这种情况，有没有办法在添加属性映射之前检查inboundInfo密钥路径是否存在？

P.S。如果inboundInfo未与JSON一起返回，则上述行会导致崩溃，删除应用程序就行了。

编辑：使用RKDynamicMapping解决了这样的问题：

//configuring the dynamic mapping
[dynamicMapping setObjectMappingForRepresentationBlock:^RKEntityMapping *(id representation) {

    if([[representation objectForKey:@"inboundInfo"] isKindOfClass:[NSDictionary class]]) {
        if(![itineraryMapping.propertyMappings containsObject:inboundInfoMapping]) { //to prevent adding inboundInfoMapping more than once
            [itineraryMapping addPropertyMapping:inboundInfoMapping];
        }
    }

    //if inboundInfo is not a dictionary simply return the itineraryMapping without adding inboundInfoMapping on it
    return itineraryMapping;

}];

Answer 1

您可以使用RKDynamicMapping运行一个代码块来分析响应并决定您要应用的映射。

http://restkit.org/api/latest/Classes/RKDynamicMapping.html

（动态对象映射部分）https://github.com/RestKit/RestKit/wiki/Object-mapping

RestKit 0.2x：如何在应用映射之前检查keyPath是否存在

1 个答案: