Re: [apps-discuss] draft-pbryan-json-patch-04 - comments

["Paul C. Bryan" <[e-mail]>]

On Mon, 2012-03-12 at 13:53 -0700, Mike Acar wrote:

> I'm unsure about test as well. It seems strange to me to express "change 
> this document if it looks like this" in a patch; if the application 
> creating the patch doesn't know how the document looks, how can it 
> create a patch?

I'm surprised that it seems so strange, as this is very much like how
text-based diff/patches work. It allows assumptions about the state of
the resource being modified to be a precondition to successfully
modifying the resource. With HTTP, it's ideal if precondition headers be
used, but this is not always feasible, nor is HTTP the only avenue for
using JSON Patch.


> Paul, is there an archived discussion of the "test" operation, 
> particularly regarding use cases?


This was originally discussed on the JSON Patch Google Group discussion.

Paul