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From Mario Scheliga <>
Subject Re: Chaining of views/MapReduce
Date Wed, 17 Feb 2010 22:15:58 GMT
Hi Norman,

updating a document from map-function its not possible and seems to be  
the wrong way.
Thinking of map function processing docs seperatly (sandbox), so you  
are able to
spread the execution over thousand of servers ;-)


Am 17.02.2010 um 21:04 schrieb Norman Rosner:

> Hi folks,
> first, I'll have to admit that I'm kinda new to JavaScript and of  
> course to CouchDB.  Second I just reuse the subject so I hope it  
> also pops up if anybody searches for it.
> As I read chaining of views is not possible yet but it's mentioned  
> couple of times on the mailing list. So here's what I want to do:
> 1. Create a list of unique labels/tags/whatever through all of the  
> documents (e.g. all nouns that are in the documents)
> 2. Extract all labels/tags/nouns of each document and check them  
> again the before calculated result in some kind of way
> For the second point I created a view which works except of the  
> checking against the result from point 1. Now I'm trying to solve  
> point 1.
> And here my questions begin: How can I create/update a document from  
> inside of a map function? As I think of it, I'll have to make a HTTP  
> GET to load the document in each iteration. I found some HTTP stuff  
> in the test.js in the test folder, but I'm not quite sure how to use  
> it and if it's the right way of thinking? Is there any way of using  
> global variables throughout 'couchapps' (e.g. through the lib folder  
> and thelike)?
> Any help of you CouchDB kings would be greatly appreciated!
> Cheers,
> norman

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