我正在尝试使用RestKit(0.23.1)来解析一些Atom XML,如下所示:
<feed xmlns="http://www.w3.org/2005/Atom" xmlns:ex="http://my.library.com">
<entry>
<title>Title 1</title>
<link href="http://localhost:2001/1" />
<id>urn:uuid:a6e04980-e273-11e3-8b68-0800200c9a66</id>
<updated>2013-12-21T18:30:02Z</updated>
<summary>Summary 1</summary>
<ex:thing>
<ex:name>Thing 1</ex:name>
</ex:thing>
<ex:thing>
<ex:name>Thing 2</ex:name>
</ex:thing>
</entry>
</feed>
我正在使用对象映射器将提要映射到两个对象。第一个对象代表供稿中包含一系列事物的条目。
@interface Entry : NSObject
@property NSString *title;
@property NSString *summary;
@property NSMutableArray *things;
@end
NSMutableArray将包含事物的集合。
@interface Thing : NSObject
@property NSString *name;
@end
最后,RestKit代码将所有这些粘合在一起:
- (void) parseAtomThings {
[RKMIMETypeSerialization registerClass:[RKXMLReaderSerialization class] forMIMEType:@"application/atom+xml"];
RKObjectMapping *entryMapping = [RKObjectMapping mappingForClass:[Entry class]];
[entryMapping addAttributeMappingsFromDictionary:@{
@"title.text" : @"title",
@"summary.text" : @"summary"
}];
RKObjectMapping *thingMapping = [RKObjectMapping mappingForClass:[Thing class]];
[thingMapping addAttributeMappingsFromDictionary:@{
@"name.text" : @"name"
}];
// TODO - how do I get this to map to ex:thing?
[entryMapping addRelationshipMappingWithSourceKeyPath:@"thing" mapping:thingMapping];
RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:entryMapping method:RKRequestMethodGET pathPattern:nil
keyPath:@"feed.entry" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://localhost:2001/library.xml"]];
RKObjectRequestOperation *operation = [[RKObjectRequestOperation alloc] initWithRequest:request responseDescriptors:@[responseDescriptor]];
[operation setCompletionBlockWithSuccess:^(RKObjectRequestOperation *operation, RKMappingResult *result) {
for(Entry *entry in [result array]) {
NSLog(@"%@", entry.description);
}
} failure:^(RKObjectRequestOperation *operation, NSError *error) {
NSLog(@"Failed with error: %@", [error localizedDescription]);
}];
[operation start];
}
执行后,将填充Entry对象的title和summary属性。但是,事物的NSMutableArray未填充且为零。
我确定我正在寻找的魔力围绕着这条线:
[entryMapping addRelationshipMappingWithSourceKeyPath:@"thing" mapping:thingMapping];
但是我不知道如何正确地指定Entry类上的Thing属性的映射列表。
日志记录在这里:
2014-05-23 23:06:05.457 TestApp[61282:3303] D restkit.object_mapping:RKMappingOperation.m:859 Starting mapping operation...
2014-05-23 23:06:05.457 TestApp[61282:3303] T restkit.object_mapping:RKMappingOperation.m:860 Performing mapping operation: <RKMappingOperation 0xbe3b4b0> for 'Entry' object. Mapping values from object {
"ex:thing" = (
{
"ex:name" = {
text = "Thing 1";
};
text = "";
},
{
"ex:name" = {
text = "Thing 2";
};
text = "";
}
);
id = {
text = "urn:uuid:a6e04980-e273-11e3-8b68-0800200c9a66";
};
link = {
href = "http://localhost:2001/1";
text = "";
};
summary = {
text = "Summary 1";
};
text = "";
title = {
text = "Title 1";
};
updated = {
text = "2013-12-21T18:30:02Z";
};
} to object <Entry: 0xbe39e00> with object mapping (null)
2014-05-23 23:06:05.458 TestApp[61282:3303] D restkit.object_mapping:RKMappingOperation.m:728 Did not find mappable relationship value keyPath 'thing'
2014-05-23 23:06:05.459 TestApp[61282:3303] T restkit.object_mapping:RKMappingOperation.m:438 Found transformable value at keyPath 'summary.text'. Transforming from class '__NSCFString' to 'NSString'
2014-05-23 23:06:05.459 TestApp[61282:3303] T restkit.object_mapping:RKMappingOperation.m:453 Mapping attribute value keyPath 'summary.text' to 'summary'
2014-05-23 23:06:05.459 TestApp[61282:3303] T restkit.object_mapping:RKMappingOperation.m:469 Mapped attribute value from keyPath 'summary.text' to 'summary'. Value: Summary 1
2014-05-23 23:06:05.459 TestApp[61282:e03] D restkit.object_mapping:RKPropertyInspector.m:131 Cached property inspection for Class 'Entry': {
summary = {
isPrimitive = 0;
keyValueCodingClass = NSString;
name = summary;
};
things = {
isPrimitive = 0;
keyValueCodingClass = NSMutableArray;
name = things;
};
title = {
isPrimitive = 0;
keyValueCodingClass = NSString;
name = title;
};
}
2014-05-23 23:06:05.460 TestApp[61282:3303] T restkit.object_mapping:RKMappingOperation.m:438 Found transformable value at keyPath 'title.text'. Transforming from class '__NSCFString' to 'NSString'
2014-05-23 23:06:05.460 TestApp[61282:3303] T restkit.object_mapping:RKMappingOperation.m:453 Mapping attribute value keyPath 'title.text' to 'title'
2014-05-23 23:06:05.461 TestApp[61282:3303] T restkit.object_mapping:RKMappingOperation.m:469 Mapped attribute value from keyPath 'title.text' to 'title'. Value: Title 1
2014-05-23 23:06:05.461 TestApp[61282:3303] D restkit.object_mapping:RKMappingOperation.m:928 Finished mapping operation successfully...
2014-05-23 23:06:05.461 TestApp[61282:3303] D restkit.object_mapping:RKMapperOperation.m:403 Finished performing object mapping. Results: {
"feed.entry" = "<Entry: 0xbe39e00>";
}
日志明确指出:
014-05-23 23:06:05.458 TestApp[61282:3303] D restkit.object_mapping:RKMappingOperation.m:728 Did not find mappable relationship value keyPath 'thing'
我猜我看不到树木的树木,而错过了真正明显的东西。任何帮助深表感谢。
最佳答案
您在关键路径中缺少ex:
。
为此,您将需要创建一个关系映射并添加它(使用relationshipMappingFromKeyPath:toKeyPath:withMapping:
),而不是使用便利的方法addRelationshipMappingWithSourceKeyPath:mapping:
(因为源路径和目标路径不同)。
相同的问题扩展到需要将@"name.text"
更改为@"ex:name.text"
的名称。