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From Apache Wiki <wikidi...@apache.org>
Subject [Couchdb Wiki] Update of "Error_messages" by JeffOllie
Date Wed, 17 Mar 2010 21:11:47 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Couchdb Wiki" for change notification.

The "Error_messages" page has been changed by JeffOllie.
The comment on this change is: Document cause of runtime error.
http://wiki.apache.org/couchdb/Error_messages?action=diff&rev1=19&rev2=20

--------------------------------------------------

  
  While the above guard will work in most cases, it's worth bearing !JavaScript's falsy set
of values in mind. Testing against a property with a value of `0` (zero), `''` (empty String),
`false` or `null` will return false. If this is undesired a guard of the form `if (doc.foo
!== undefined)` should do the trick.
  
+ This error can also be caused if a reduce function does not return a value.  For example,
this reduce function will cause an error:
+ 
+ {{{
+ function(key, values) {
+   sum(values);
+ }
+ }}}
+ 
+ The function needs to return a value:
+ 
+ {{{
+ function(key, values) {
+   return sum(values);
+ }
+ }}}
+ 
  <<Anchor(replicationreceivedexceptionerrorbadmatchreasonerroralreadypresent)>>
  == replication received exception ({"error":"badmatch","reason":"{error,already_present}"})
==
  

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