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From: John Bartak <john.bartak@autodesk.com>
To: "couchdb-user@incubator.apache.org" <couchdb-user@incubator.apache.org>
Date: Fri, 7 Nov 2008 17:05:03 -0800
Subject: Reduce function error "keys has no properties"
Thread-Topic: Reduce function error "keys has no properties"
Thread-Index: AclBPggsfzqd0p9fT5KR4Urz5Ds/WA==
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I get the error "Query Server Log Message: function raised exception (TypeE=
rror: keys has no properties)" when I run my reduce function and try to use=
 the keys parameter.  I thought keys was supposed to have the documentId's =
for each document passed in through the values parameter?

 My View looks like:

function(doc)
{
   function emitParts(parts,doc)
   {
           for (var i =3D 0; i < parts.length; ++i)
           {
                     emit(parts[i].substr(0,3).toLowerCase(),doc);
           }
   }

   if (doc.type =3D=3D "Person")
   {
                  var parts;
                  if (doc.Name && typeof(doc.Name) =3D=3D "string")
                  {
                                parts =3D doc.Name.split(new RegExp("[ ]"))=
;
                                emitParts(parts,doc);
                  }
                  if (doc.Email && typeof(doc.Email) =3D=3D "string")
                  {
                                parts =3D doc.Email.split(new RegExp("[.@ ]=
"));
                                emitParts(parts,doc);
                  }

   }
 }
 function( keys, values )
 {
               var usedKeys =3D '';
                var reduced =3D [];
                for ( var i =3D 0; i < keys.length; ++i )
                {
                                if (usedKeys.indexOf('%!' + keys[i] + '%!')=
 =3D=3D -1)
                                {
                                                usedKeys =3D usedKeys + '%!=
' + keys[i] + '%!';
                                                reduced.push(values[i]);
                                }
                }
                return reduced;
}

If I remove any reference to keys from the reduce function, the error goes =
away.

This View creates keys where that are the first 3 characters found in every=
 word of the Person's eMail and Name fields.

The intent of the usedKeys code in the reduce function is deal with the cas=
e where a document has an Email field and a Name field that have words that=
 start with the same 3 characters.  It prevents the same document from bein=
g inserted in the results twice.


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