RestKit：如何定义可选（嵌套）键路径
我有一个像这样的 JSON 结构
{
"objects":{
"person":[
{
"id":"1",
"name":"my name"
"contacts":{
"address":{
"id":"1",
"street":"mystreet",
"country":"mycountry"
},
"email":{
"id":"1",
"emailAddress":"[email protected]"
}
},
},
...
，我正在尝试按以下方式映射它：
[personMapping mapKeyPath:@"contacts.address" toRelationship:@"address" withMapping:addressMapping];
只要联系人存在，这种方法就可以正常工作。但如果没有地址/电子邮件，则不会发送此元素，这会导致 RKMappingOperation#applyRelationshipMappings 中出现异常： value = [self.sourceObject valueForKeyPath:relationshipMapping.sourceKeyPath];
现在，我的解决方法是使用 @try...@catch，但我希望有更好的解决方案...
非常感谢！
编辑：如果根本没有发送任何联系人，则会发生异常；那么，JKDictionary 看起来像这样（同样在 RKMappingOperation#applyRelationshipMappings 中）：
{
contacts = "";
name = myName;
id = 1;
...
}
I've a JSON-structure like
{
"objects":{
"person":[
{
"id":"1",
"name":"my name"
"contacts":{
"address":{
"id":"1",
"street":"mystreet",
"country":"mycountry"
},
"email":{
"id":"1",
"emailAddress":"[email protected]"
}
},
},
...
and I'm trying to map it the following way:
[personMapping mapKeyPath:@"contacts.address" toRelationship:@"address" withMapping:addressMapping];
This works well as long as contacts is existing. But if there's no address/email, then this element isn't sent, which leads to an exception in RKMappingOperation#applyRelationshipMappings: value = [self.sourceObject valueForKeyPath:relationshipMapping.sourceKeyPath];
Right now, my workaround is to use @try...@catch, but I hope there's a better solution for this...
Thanks a lot!
EDIT: The exception happens then if no contacts are sent at all; then, the JKDictionary looks like this (again in RKMappingOperation#applyRelationshipMappings):
{
contacts = "";
name = myName;
id = 1;
...
}
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（1）
也许您应该在实例化对象时正确初始化它们？也许一开始你的所有财产都是零；然后随着您的操作填写属性；在提交（或映射或其他任何内容）之前，检查属性值的数据完整性。
Maybe you should properly initialise your objects when you instantiate them? Maybe start out with all your properties zero; then as you go along fill out properties; and before you commit (or map or whatever), check the data integrity of your property values..