我有一个核心数据关系映射,如下所示:
这个JSON:
{
user: {
rid: '1234'
providers: {
[
foursquare: {
rid: '1234'
},
facebook: {
rid: '1234'
}
]
}
}
使用此映射:
RKEntityMapping *foursquareProviderMapping = [RKEntityMapping mappingForEntityForName:@"FoursquareProvider" inManagedObjectStore:managedObjectStore];
foursquareProviderMapping.identificationAttributes = @[@"rid"];
[foursquareProviderMapping addAttributeMappingsFromArray:@[@"rid"]];
RKEntityMapping *facebookProviderMapping = [RKEntityMapping mappingForEntityForName:@"FacebookProvider" inManagedObjectStore:managedObjectStore];
facebookProviderMapping.identificationAttributes = @[@"rid"];
[facebookProviderMapping addAttributeMappingsFromArray:@[@"rid"]];
RKEntityMapping *userMapping = [RKEntityMapping mappingForEntityForName:@"User" inManagedObjectStore:managedObjectStore];
userMapping.identificationAttributes = @[@"rid"];
[userMapping addAttributeMappingsFromArray:@[@"rid"]];
[userMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"providers.foursquare" toKeyPath:@"providers" withMapping:foursquareProviderMapping]];
[userMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"providers.facebook" toKeyPath:@"providers" withMapping:facebookProviderMapping]];
这会导致toKeyPath的多键路径映射错误:@“providers”
有没有正确的方法来映射?如果需要更改,我可以完全控制JSON。
答案 0 :(得分:0)
您可以使用RKDynamicMapping来解决此问题。首先,你应该改变你的JSON。
{
user: {
rid: '1234'
providers: [
{
type: "foursquare"
rid: '1234'
},
{
type: "facebook"
rid: '1234'
}
]
}
}
之后使用像这样的动态映射
RKEntityMapping *foursquareProviderMapping = [RKEntityMapping mappingForEntityForName:@"FoursquareProvider" inManagedObjectStore:managedObjectStore];
foursquareProviderMapping.identificationAttributes = @[@"rid"];
[foursquareProviderMapping addAttributeMappingsFromArray:@[@"rid"]];
RKEntityMapping *facebookProviderMapping = [RKEntityMapping mappingForEntityForName:@"FacebookProvider" inManagedObjectStore:managedObjectStore];
facebookProviderMapping.identificationAttributes = @[@"rid"];
[facebookProviderMapping addAttributeMappingsFromArray:@[@"rid"]];
RKDynamicMapping *dynamicMapping = [RKDynamicMapping new];
[dynamicMapping addMatcher:[RKObjectMappingMatcher matcherWithKeyPath:@"type" expectedValue:@"facebook" objectMapping:facebookProviderMapping]];
[dynamicMapping addMatcher:[RKObjectMappingMatcher matcherWithKeyPath:@"type" expectedValue:@"foursquare" objectMapping:foursquareProviderMapping]];
RKEntityMapping *userMapping = [RKEntityMapping mappingForEntityForName:@"User" inManagedObjectStore:managedObjectStore];
userMapping.identificationAttributes = @[@"rid"];
[userMapping addAttributeMappingsFromArray:@[@"rid"]];
[userMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"providers" toKeyPath:@"providers" withMapping:dynamicMapping]];