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From: Robin Berjon <robin@berjon.com>
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Subject: Rewrite inside of a path segment
Message-Id: <DB0D8538-70A4-4683-B29B-846807A49F46@berjon.com>
Date: Tue, 18 Sep 2012 10:16:55 +0200
To: user@couchdb.apache.org
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Hi all,

I am using rewrites in order to expose a nice API but I am hitting a =
problem with rewrites. The constraints I have are as follows (my app is =
not a blog, but I'll use that for examples as it'll be simpler). First, =
I would like these three basic operations to work:

GET /blog/this-is-my-title
PUT /blog/this-is-my-title
DELETE /blog/this-is-my-title

So far so good. But the second constraint is that "this-is-my-title" is =
not the ID of the relevant documents, but rather the value of one of =
their fields. It is unique within a type, but not unique across all =
types in the DB (otherwise I'd just use it as the ID and call it a day). =
So I generate IDs based on concatenating the type and that field.

I got this working easily for GET and PUT, using rewrites that point =
respectively to a view indexed on the right type plus field, and an =
update handler that generates the correct ID on the fly.

For DELETE though, I'm stuck. I've tried a bunch of variations from =
rewriting to the document itself to rewriting to an update handler that =
sets the _deleted attribute but I can't seem to work my way to a =
solution.

The problem is that I need a rewrite that invariably accepts parameters =
that don't fall at the / boundary. Typically:

{
    from:   "/blog/*"
,   to:     "../../blog.*"
,   method: "DELETE"
}

And that doesn't work. It just invariably encodes the * or :id, or =
whatnot. Have I missed something? I of course could simply expose =
another ID for DELETE or ugly IDs everywhere, but that completely =
defeats the point of having rewrites in the first place.

Thanks for any suggestions!

--=20
Robin Berjon - http://berjon.com/ - @robinberjon