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Date: Mon, 27 Jul 2009 20:44:32 -0400
Message-ID: <e2111bbb0907271744k70f21f72n2f12d7d2a4ac0f34@mail.gmail.com>
Subject: Re: Problems with reduce in view appear when record size > 6
From: Paul Davis <paul.joseph.davis@gmail.com>
To: user@couchdb.apache.org
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Looks like you're creeping past the end of the array and getting an
undefined value which the JSON serializer refuses to convert. Try
protecting against it with '|| null' towards the end of your array
access.

Paul

On Mon, Jul 27, 2009 at 8:33 PM, Jochen Kempf<jochenkempf@gmail.com> wrote:
> Hi,
>
> I am experiencing a problem when using a reduce in the following way:
>
> First, I define a map function returning at least 4 values (here i define=
 6
> values) -->
>
>> function(doc) {
>> =A0 emit(doc["_id"], [doc["_id"], doc["_rev"], doc["var1"], doc["var2"],
>> doc["var3"], doc["var4"], doc["var5"]]);
>> }
>
>
>
> Until here, everything works fine!
> But once I define the following reduce function it stops working from 6 o=
r 7
> records on upwards (if the total record size of the corresponding databas=
e
> is < 6 it works fine):
>
>> function(key, values, combine) {
>> =A0 =A0 =A0 =A0 var ids =3D [];
>> =A0 =A0 =A0 =A0 var revs =3D [];
>> =A0 =A0 =A0 =A0 var variables =3D [];
>> =A0 =A0 =A0 =A0 for (i in values) {
>> =A0 =A0 =A0 =A0 =A0 ids.push(values[i][0]);
>> =A0 =A0 =A0 =A0 =A0 revs.push(values[i][1]);
>> =A0 =A0 =A0 =A0 =A0 variables.push([values[i][2], values[i][3], values[i=
][4],
>> values[i][5], values[i][6]]);
>> =A0 =A0 =A0 =A0 }
>> =A0 =A0 =A0 =A0 return [ids, revs, variables];
>> =A0 =A0 =A0 }
>
>
> This is the error message:
>
>> Error: case_clause
>>
> {{badmatch,<<"Cannot encode 'undefined' value as JSON">>},
>> =A0[{couch_query_servers,'-rereduce/3-fun-0-',3},
>> =A0 {lists,zipwith,3},
>> =A0 {couch_query_servers,rereduce,3},
>> =A0 {couch_view_group,'-init_group/4-fun-0-',4},
>> =A0 {couch_btree,'-write_node/3-lc$^0/1-0-',3},
>> =A0 {couch_btree,write_node,3},
>> =A0 {couch_btree,complete_root,2},
>> =A0 {couch_btree,query_modify,4}]}
>>
>
> Anyone knows what is going on?
>