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From Benoit Chesneau <bchesn...@gmail.com>
Subject Re: [PROPOSAL] new underscore namespacing
Date Tue, 03 Dec 2013 18:14:12 GMT
On Tue, Dec 3, 2013 at 7:12 PM, Benoit Chesneau <bchesneau@gmail.com> wrote:

>
>
> On Tue, Dec 3, 2013 at 3:01 PM, Benjamin Young <byoung@bigbluehat.com>wrote:
>
>> Hi all,
>>
>> Recently the "doc._*" reservation has been causing me trouble when
>> pulling in "arbitrary" JSON from various sources that also use the
>> underscore prefixed names for things (HAL [1], vnd.error [2], other APIs).
>> I've also hit the wall several times when trying to import filesystem
>> contents (Sphinx, ghpages, and the like) that use _* prefixing for their
>> "special folders."
>>
>> As such, I'd like to propose the following:
>> 1. Begin storing new reserved terms in doc._.* (rather than doc._*).
>>  - this gives developers one object to look into for the meta-data about
>> a doc
>>  - you can see the scope creep of our current doc._* best in the
>> replicator status messages.
>>     - doc._ replication_* would become doc._.replication.*
>> 2. Move "magic" API endpoints under "/_/" term as well (for the sake of
>> attachments.
>>  - _design/doc would stay the same
>>  - but the child endpoints would live under "_design/doc/_/*"
>>     - _design/doc/_/view/by_date
>>     - _design/doc/_/list/by_date/ul
>>     - _design/doc/_/rewrite
>>
>> I realize these are extreme API shifts, and would need to wait for
>> CouchDB 2.0.
>>
>> The first steps this direction would be to put new reserved word keys
>> into a "doc._.*" namespace going forward. Closer to the "cut over" for 2.0
>> duplicates of the existing keys (doc._id, doc._rev, especially) could also
>> live at their new underscore prefixed names (doc._.id, doc._.rev) which
>> would give devs a chance to migrate code and content.
>>
>> Doing this would:
>> 1. Give us "limitless" space to add content.
>> 2. Encourage a namespacing pattern for things like doc._.replication.* or
>> other logically grouped content.
>> 3. Free up CouchDB to accept a far broader range of content and remove
>> the "hey, you can't put that there! I was here first!" errors. :)
>>
>> Thanks for considering this,
>> Benjamin
>>
>> [1] http://stateless.co/hal_specification.html
>> [2] https://github.com/blongden/vnd.error
>>
>
> I don't see why couchdb should adapt itself to newer things that didn't
> take care of an older API when doing their stuff but that's probably
> another concern ;)
>
> I would find a "/_/" in the URL rather ugly and not needed in that case.
> Same for having a _ in a doc.  also it doesn't have much sense. Why do you
> want to change the HTTP api at that level?
>
> Another way to do it and probably more restish woudl be moving all couchdb
> resources in their own namespace. Say `couchdb/` for example. so anything
> in the resource couchdb will be related to couchdb.
>
> Next is the the prefix "_" in the doc. It's actually reserved because
> sometimes, once day we will add other metadata which is fine. But raises
> the issue you have.
>
> If I summarise the discussion here amd precedent discussions there are
> different school there:
>
> - remove the metadata from the doc and put them in headers or aside. I
> quite like the first solution, though it may be a problem behind some
> proxies, or with the header length (especially for json values). Also
> headers are supposed to be in latin1 in a lot of clients...
> - put the metadata in their own namespace which is what you propose.
>
> I dislike the last solution. Mostly because it would force the clients to
> wait this namespace to read the metadata while parsing the JSON (which
> could be when streaming it). Instead I would prefer to keep them at the
> first level and due the reverse: put the data in their own namespace, say
> `_data`. This allows any clients to ignore this layer if needed while
> parsing the JSON and get it directly (without parsing  then). The metadata
> should be the first citizem imo. Optionally we could add some new
> parameters to the doc api allowing someone to only fetch the metadata,
> etc.. Also couchdb could also parse the coming doc and stop to parse the
> json when seeing this property and store it directly. It is also following
> the logic of attachments somehow. Another things that could be done at the
> api level is having smth like `/db/docid/_data` which would allows you to
> only retrieve the data instead of using a show function.
>
> What do you think?
>
> - benoit
>
>
> s/due/do (exhausted)

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