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From: Nils Breunese <N.Breunese@vpro.nl>
To: "user@couchdb.apache.org" <user@couchdb.apache.org>
Date: Wed, 20 Apr 2011 14:11:20 +0200
Subject: Dealing with sealed docs
Thread-Topic: Dealing with sealed docs
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Hello all,

I recently upgraded to CouchDB 1.0.2 for development and found some of our =
view map functions broke. Apparently it's no longer possible to modify data=
 a doc in a view function before emitting. I found "Documents are now seale=
d before being passed to map functions." in the changelog for 1.0.2.

This is an example of a map function which no longer works under 1.0.2:

----
function(doc) {
  if(doc.type =3D=3D=3D 'schedule') {
    var events =3D doc.events;
    if (events) {
      events.forEach(function(event) {
        var broadcasters =3D event.broadcasters;
        if (broadcasters) {
          broadcasters.forEach(function(broadcaster) {
            if(broadcaster =3D=3D=3D 'VPRO') {
              event.channel =3D doc.channel;
              event.channelName =3D doc.channelName;
              emit(event.end, event);
            }
          });
        }
      });
    }
  }
}
----

A colleague suggested using this:

----
events.forEach(function(e) {
  var event =3D eval(uneval(e));
----

This creates a deep copy before modifying event properties. It works, but i=
t looks ugly to me. Is this the way to go or is there a cleaner way?

Nils.
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