Re: [apps-discuss] JSON patch: "test" operation

Yes, assert/equals/test has been mentioned in the past. As you point
out, HTTP preconditions to handle this to some extent. I've avoided
adding it thus far mostly because I haven't had a single concrete use
case outside of HTTP. Given at least the pattern of multiple requests
wanting to test a value for equality, I think I have enough data to add
it to the next revision of the spec. Consider it added.

Paul 

On Wed, 2011-11-30 at 16:22 +0100, Julian Reschke wrote:

> Hi,
> 
> this came up during discussions of patch formats on the Apache 
> jackrabbit-dev mailing list:
> 
> Would it make sense to add a "test" operation that allows checking the 
> state of the JSON object to be modified?
> 
> It would be consistent with other diff formats that use context 
> information in order to check whether the patch "cleanly applies".
> 
> An example would be:
> 
>     [
>           { "test": "/vsn", "value" : 17 },
>           { "replace": "/vsn", "value" : 18 },
>           { "replace": "/balance", "value": 1234 }
>     ]
> 
> And yes, concurrency control can also be achieved using conditional HTTP 
> methods, but that doesn't mean that they don't make sense in the patch 
> format as well.
> 
> Best regards, Julian
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