My apologies - I have mis-remembered. No, there is no clone operator,
but some functions will return a copy rather than a reference.
I had a view that looked like:
function(doc) {
if (doc.status=='active' && doc.doc_type=='group') {
doc.path.pop();
emit(doc.path, doc.display_name);
}
}
And it (on pre-1.0.2 couchdb) failed to generate the views properly,
because doc.path.pop() was modifying the doc and the next views were
receiving that modified version.
In my case, changing the view to this fixed it:
function(doc) {
if (doc.status=='active' && doc.doc_type=='group') {
path = doc.path.slice(0);
path.pop();
emit(path, doc.display_name);
}
}
So doc.path.slice(0) copies the whole doc.path array for me so that I
can modify it before emitting. No such neat method exists for objects
unfortunately, but how about:
function(doc) {
if(doc.type === 'schedule') {
var events = doc.events;
if (events) {
events.forEach(function(event) {
var broadcasters = event.broadcasters;
if (broadcasters) {
broadcasters.forEach(function(broadcaster) {
if(broadcaster === 'VPRO') {
- event.channel = doc.channel;
- event.channelName = doc.channelName;
- emit(event.end, event);
+ var _event = {channel:doc.channel,
channelName:doc.channelName};
+ for (var k in event) _event[k]=event[k];
+ emit(event.end, _event);
}
});
}
});
}
}
}
The members of _event are only references, but that should be okay
because you're not modifying those, only adding two extra attributes to
the new object created. (Not having to _copy_ every element should also
make this approach much faster than using a generic 'clone' method)
Hope that works. :-)
-Patrick
On 21/04/2011 1:00 AM, Hay (Husky) wrote:
On Wed, Apr 20, 2011 at 4:44 PM, Patrick Barnes<[email protected]> wrote:
If you change
var events = doc.events;
to
var events = clone doc.event;
Would be great, but afaik there doesn't exist a 'clone' operator in
Javascript. Virtually all JS frameworks provide a method (such as
jQuery's 'extend' or Prototype's Object.clone), but in vanilla
Javascript no such method exists.
-- Hay
