Re: NSCoding to/from JSON?
Re: NSCoding to/from JSON?
On 8 Aug 2011, at 17:56, Jens Alfke wrote:
> Been thinking about archiving NSObjects to/from JSON, using an API similar to NSCoding. I haven’t found any prior art, but I thought I’d ask here.
>
> I am not talking about serializing JSON to/from collection objects a la TouchJSON, JSONKit, etc.; rather, something that lets you convert your custom model objects into JSON and back. And I want it to be clean JSON, so that you can use this API to unarchive JSON created by any of the zillions of web APIs that generate it.
>
> It’s tempting to try to do this using the existing NSArchiving protocol and writing a custom NSKeyed[Un]Archiver subclass. This doesn’t work, at least for my purposes, because JSON has a limited set of data types and I don’t want to clutter up the output with extra type annotations. For example, say the JSON contains a date. JSON doesn’t have a date type, so the convention is to represent the date as a string in ISO-8661 format. But calling -decodeObjectForKey: will return an NSString instead of an NSDate. To get around this you have to add methods like -decodeDateForKey: that make it more clear what you’re expecting. (The same goes for other common value classes like NSData.)
>
>
Have you thought about using YAML?
JSON is a strict subset of YAML.
http://yaml.org/spec/1.2/spec.html#id2759572
There are a number of bindings available.
Regards
Jonathan Mitchell
Developer
Mugginsoft LLP
http://www.mugginsoft.com
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