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From Luca Matteis <lmatt...@gmail.com>
Subject Re: Hierarchical comments Hacker News style
Date Wed, 16 May 2012 16:25:33 GMT
Sean,
interesting. What would be the drawbacks of this other than the
conflict issue? How would I order the comments by score - would my
view need to do the logic? Also, what if there's *many* comments to a
post. How much can a single document handle?

Luca

On Wed, May 16, 2012 at 5:32 PM, Sean Copenhaver
<sean.copenhaver@gmail.com> wrote:
> Is it not possible to maintain the scores and ordering in a document by
> itself? Something like
>
> {
>    _id: <whatever>
>    post: <post id>
>    comments: {
>         <top level comment id>: { score: ##, children: <comments of
> similar structure> },
>         <another top level comment id> : <etc>
>    }
> }
>
> A view could easily allow one call to CouchDB retrieve the original post
> and this comment scoring doc. Then you can load whatever level of comments
> you need to and know the ordering and hierarchy.
>
> Score changes on a comment though you would need to keep updating this
> document which can lead to conflicts. An update handler to increment the
> score and reorder the comments will help with that and if a conflict causes
> the update handler to error back to the client you just submit the same one
> again.
>
> I have not implemented this solution myself, but throwing out ideas. I'm
> certainly curious what others think is the best way.
>
> On Wed, May 16, 2012 at 9:33 AM, Dirkjan Ochtman <dirkjan@ochtman.nl> wrote:
>
>> On Wed, May 16, 2012 at 3:19 PM, Luca Matteis <lmatteis@gmail.com> wrote:
>> > Ok. Where would it be appropriate to build such a tree? Can I do it in
>> > a list function?
>> > I'm using Couch directly and not interacting with it using other
>> > languages, so I need Couch to do all the work.
>>
>> Should be possible to do it in the list function, but I haven't worked
>> with list functions before.
>>
>> Also note that this topic is solidly off-topic for dev@, and should
>> actually be discussed on user@.
>>
>> Cheers,
>>
>> Dirkjan
>>
>
>
>
> --
> “The limits of language are the limits of one's world. “ - Ludwig von
> Wittgenstein
>
> "Water is fluid, soft and yielding. But water will wear away rock, which is
> rigid and cannot yield. As a rule, whatever is fluid, soft and yielding
> will overcome whatever is rigid and hard. This is another paradox: what is
> soft is strong." - Lao-Tzu

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