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From: Apache Wiki <wikidiffs@apache.org>
To: couchdb-commits@incubator.apache.org
Date: Sun, 19 Apr 2009 09:58:43 -0000
Message-ID: <20090419095843.10222.61305@eos.apache.org>
Subject: [Couchdb Wiki] Update of "View Snippets" by WoutMertens

Dear Wiki user,

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The following page has been changed by WoutMertens:
http://wiki.apache.org/couchdb/View_Snippets

------------------------------------------------------------------------------
  This page collects code snippets to be used in your ["Views"]. They are mainly meant to help get your head around the map/reduce approach to accessing database content. Keep in mind that the the Futon web client silently adds group=true to your views.
+ 
+ == Common mistakes ==
+ 
+ When creating a reduce function, a re-reduce should behave in the same way as the regular reduce. The reason is that CouchDB doesn't necessarily call re-reduce on your map results.
+ 
+ Think about it this way: If you have a bunch of values V1 V2 V3 for key K, then you can get the combined result either by calling reduce([K,K,K],[V1,V2,V3],0) or by re-reducing the individual results: reduce(null,[R1,R2,R3],1). This depends on what your view results look like internally.
  
  == Get docs with a particular user id ==