On Apr 12, 2010, at 10:42 PM, Cesar Delgado wrote:
> I'm playing around with CouchDB and am kinda curious if I can add a new
> member to an object in the map (and/or reduce I guess as well) part.
>
> Ok, so an example is I have an object with a name and a plain-text password:
> {"name":"cesar", "passwd":"insecure"}
>
> What I would like to do is run a map function on this that computes the md5
> and then inserts it into the object. I know it's horrible practice and I know
> it's wrong and I know this is bad. It's an example so please don't flame.
>
I think you are saying you'd like to mutate the document itself from the map
function. You don't really want to do this. You can do something like this.
function(doc) {
var hash = md5(doc.password);
doc.hash = hash;
delete doc.password;
emit(doc._id, doc)
}
this will give you a value that is the whole doc but with the hash instead of
the cleartext.
If you are trying to keep cleartext out of your database, you can also use an
_update function, which can intercept updates before writing the doc to the
database. See:
http://svn.apache.org/repos/asf/couchdb/trunk/share/www/script/test/update_documents.js
for examples.
Chris
> Right now all I've been able to do is return the value as a value and the
> doc._id as the key.
>
> function(doc) {
> var hash = md5(doc.passwd) ;
> emit (doc._id,hash) ;
>
> }
>
> I'd love to just have a new JSON oabject as the value and no key.
>
> function(doc) {
> var hash = md5(doc.passwd) ;
> doc.insertmefunct("hash",hash) ;
> emit(null,doc) ;
> }
>
> would produce:
>
> {"name":"cesar",
> "passwd":"insecure","hash":"f166786326d565962e8523266c0e1d57"}
>
> Thanks for the help,
>
> -Cesar
>
>
