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From "Jan Lehnardt (JIRA)" <>
Subject [jira] Reopened: (COUCHDB-354) Ungraceful behaviour if view returns a function
Date Fri, 22 May 2009 15:46:45 GMT


Jan Lehnardt reopened COUCHDB-354:

Oh hey by no means, keep opening things as you see fit :)


The problem is that there's behaviour change between 1.7 and 1.8 and we currently only work
with 1.7. Paul offered to get this fixed. Reopening the ticket so we don't forget.


Thanks for the JS diff, too.

> Ungraceful behaviour if view returns a function
> -----------------------------------------------
>                 Key: COUCHDB-354
>                 URL:
>             Project: CouchDB
>          Issue Type: Improvement
>          Components: JavaScript View Server
>         Environment: {"couchdb":"Welcome","version":"0.10.0a776990"}
>            Reporter: Brian Candler
>            Priority: Minor
>         Attachments: barf.log, test_reduce_barf.rb
> If a typo in a view definition causes it to return a function instead of a normal value:
> * the view server crashes
> * you get a huge Erlang barf in the log with worrying messages like "OS process timed
out" and "brutal kill"
> I got all this just by accidentally writing "vs.shift" instead of "vs.shift()"
> The fundamental problem is that a function cannot be serialised in toJSON, but the error
message is not helpful:
> OS Process Log Message: Error converting object to JSON: TypeError: {Array:function (v)
{var ... snip loads ... "Object"] is not a function
> When actually the problem is that the object I was trying to convert *was* a function
> I will attach some code which replicates this, and the barf generated.
> Of course this is entirely down to user error in an invalid map/reduce function. However
there's already a clean error for 'undefined', maybe this could be done for 'function' too
(or indeed any non-serialisable entity)

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