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Date: Wed, 3 Jul 2013 01:25:02 +0400
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Subject: Re: On Alternative View Engines
From: Alexander Shorin <kxepal@gmail.com>
To: "dev@couchdb.apache.org" <dev@couchdb.apache.org>
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That's right so why it's called JSON pointer - it was design for a bit
different proposes, but still may be useful for DSL/DDL.
--
,,,^..^,,,


On Tue, Jul 2, 2013 at 9:29 PM, Russell Branca <chewbranca@apache.org> wrote:
> On Tue, Jul 2, 2013 at 10:07 AM, Alexander Shorin <kxepal@gmail.com> wrote:
>
>> On Tue, Jul 2, 2013 at 8:31 PM, Russell Branca <chewbranca@apache.org>
>> wrote:
>> > I like the link to JSON Pointer, Alexander, that's intriguing. Something
>> > like that could be very useful for simple views, although the RFC is
>> quite
>> > vague on edge cases, ie how would you implement something like if
>> (doc.type
>> > == "foo") emit(doc.bar, doc.baz) with JSON pointer. Speaking of JSON
>> > pointer, looks like Jan beat us to the punch ;-)
>> > https://github.com/janl/erl-jsonpointer
>>
>> JSON Pointer suggest to raise an error in case if pointer points to
>> the non existed value.
>> Probably, this case in DDL context will be like:
>>
>>   with doc emit /bar, /baz if /type is "foo"
>>
>> loops:
>>
>>   with doc map(emit(/bar, /baz) for foo in /boo if /bar is null break)
>>
>> a bit pythonic, but please don't shoot (:
>>
>> --
>> ,,,^..^,,,
>>
>
> Sure, so we can create a DDL or what have you, but unless I'm missing
> something, I don't see a way to make a view that filters on doc.type or
> some other field, and then emits a simple set of values, which I think is
> required for a minimal view implementation. The idea of JSON pointers where
> we can just let users define path strings for the key and value is really
> intriguing, but missing functionality.
>
>
> -Russell