【发布时间】：2013-09-25 15:00:30
【问题描述】：
这是 JSON 返回，我正在尝试映射“结果”->“id”并将其添加到 Core Data 中的幻灯片实体，到目前为止一切都是映射我只是不知道如何访问它parent id 并将其映射到 Slides Entity
{
"result": {
"id": 47,
"type": "Slidedeck",
"name": "Brendan Demo",
"version": "0.24",
"slides": [
{
"id": 767,
"label": "",
"order": 1,
"notes": "",
"file": "slide-38.jpg",
"url": "http://api.testapp.com/v4/resources/767/download/slide",
"thumb": "http://api.testapp.com/v4/resources/767/download/slide?thumb=true",
"components": {
"hotspots": []
}
},
{
"id": 768,
"label": "",
"order": 2,
"notes": "",
"file": "slide-54.png",
"url": "http://api.testapp.com/v4/resources/768/download/slide",
"thumb": "http://api.testapp.com/v4/resources/768/download/slide?thumb=true",
"components": {
"hotspots": []
}
}
]
},
"status": {
"code": 200,
"message": "OK"
}
}
我的Entity Mapping和RKResponsedescriptor如下：
RKEntityMapping *mapping = [RKEntityMapping mappingForEntityForName:@"Slides"
inManagedObjectStore:[RKManagedObjectStore defaultStore]];
[mapping addAttributeMappingsFromDictionary:@{@"id": @"slideID",
@"label": @"slideLabel",
@"order": @"slideOrder",
@"notes": @"slideNotes",
@"file": @"slideFile",
@"url": @"slideURL",
@"thumb": @"slideThumb"
}];
slidesResponseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:resourcesEntityMapping method:RKRequestMethodAny pathPattern:[NSString stringWithFormat:@"%@%@", VERSION, @"/resources/:slideDeckID"] keyPath:@"result.slides" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
有什么想法吗？为了保持代码清晰，我已经省略了之前的所有尝试。所以目前这里没有失败的尝试代码来获取父结果 id。
编辑： 如前所述，我已将@parent 添加到 RKEntityMapping
[mapping addAttributeMappingsFromDictionary:@{@"@parent.id":@"slideDeckID",
@"id": @"slideID",
@"label": @"slideLabel",
@"order": @"slideOrder",
@"notes": @"slideNotes",
@"file": @"slideFile",
@"url": @"slideURL",
@"thumb": @"slideThumb"
}];
也试过了：
[mapping addAttributeMappingsFromDictionary:@{@"@parent.slide.id":@"slideDeckID",
@"id": @"slideID",
@"label": @"slideLabel",
@"order": @"slideOrder",
@"notes": @"slideNotes",
@"file": @"slideFile",
@"url": @"slideURL",
@"thumb": @"slideThumb"
}];
但我总是收到以下跟踪消息：
没有找到可映射的属性值 keyPath '@parent.id'
或
没有找到可映射的属性值 keyPath '@parent.result.id'
任何想法我做错了什么。
编辑
当我将密钥路径设置为以下时，检查了我的日志：
reourcesResponseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:resourcesEntityMapping method:RKRequestMethodGET pathPattern:[NSString stringWithFormat:@"%@%@", VERSION, @"/resources/:slideDeckID"] keyPath:@"result.slides" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
RestKit 记录以下内容：
restkit.object_mapping:RKMapperOperation.m:231 Asked to map source object {
components = {
hotspots = (
);
};
file = "slide-54.png";
id = 768;
label = "";
notes = "";
order = 2;
thumb = "http://api.idetailapp.com/v4/resources/768/download/slide?thumb=true";
url = "http://api.idetailapp.com/v4/resources/768/download/slide";
} with mapping <RKEntityMapping:0x8e30af0 objectClass=Resources propertyMappings=(
"<RKAttributeMapping: 0x8e31b50 thumb => slideThumb>",
"<RKAttributeMapping: 0x8e31a80 @parent.id => slideDeckID>",
"<RKAttributeMapping: 0x8e31aa0 id => slideID>",
"<RKAttributeMapping: 0x8e31ad0 label => slideLabel>",
"<RKAttributeMapping: 0x8e31bb0 order => slideOrder>",
"<RKAttributeMapping: 0x8e31a50 notes => slideNotes>",
"<RKAttributeMapping: 0x8e31c00 file => slideFile>",
"<RKAttributeMapping: 0x8e31cd0 url => slideURL>"
)>
即使我的响应 json 包含父 id 元素，它似乎也无法解析：
{
result = {
id = 47;
name = "Russell Demo";
slides = (
{
components = {
hotspots = (
);
};
file = "slide-38.jpg";
id = 767;
label = "";
notes = "";
order = 1;
thumb = "http://api.idetailapp.com/v4/resources/767/download/slide?thumb=true";
url = "http://api.idetailapp.com/v4/resources/767/download/slide";
},
{
components = {
hotspots = (
);
};
file = "slide-54.png";
id = 768;
label = "";
notes = "";
order = 2;
thumb = "http://api.idetailapp.com/v4/resources/768/download/slide?thumb=true";
url = "http://api.idetailapp.com/v4/resources/768/download/slide";
}
);
type = Slidedeck;
version = "0.24";
};
status = {
code = 200;
message = OK;
};
}
我检查了我的 RestKit 版本，并在使用 Development 和 Master 分支时得到了相同的结果。已验证在此版本中的 RKMappingOperation 类中提供了 @parent。我在这里遗漏了什么？
编辑：
在我的幻灯片实体映射中添加了以下关系，但我仍然无法获取容器“结果”数据
RKEntityMapping *mapping = [RKEntityMapping mappingForEntityForName:@"Slides"
inManagedObjectStore:[RKManagedObjectStore defaultStore]];
[mapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"result"
toKeyPath:@"slides"
withMapping:mapping]];
[mapping addAttributeMappingsFromDictionary:@{@"@parent.id":@"slideDeckID",
@"id": @"slideID",
@"label": @"slideLabel",
@"order": @"slideOrder",
@"notes": @"slideNotes",
@"file": @"slideFile",
@"url": @"slideURL",
@"thumb": @"slideThumb"
}];
【问题讨论】：
标签： ios core-data restkit-0.20