Heya Chris and Sho,
On Mar 25, 2008, at 21:15 , Chris Anderson wrote:
On Tue, Mar 25, 2008 at 5:34 PM, Sho Fukamachi <[EMAIL PROTECTED]
> wrote:
Will the M/R function be able to reach across databases? For example,
if I make one database called couch.local/ blogs and one called
couch.local/posts, will I be able to define an index function that
reaches into both? Or is it limited to within the scope of one
database?
Sho,
I'm not a CouchDB internals expert, but I imagine you could use
replication to merge two databases at any point in the future.
Just to back you up (as if I had a real clue…)
You are correct, this works today and will in the future.
I'm also pretty sure that map functions can't reach into the contents
of more than one document (although reduce will be able to merge all
data with the same key, I think, so you could perhaps "join" together
related documents using a clever map function, although you may be
better off doing joins in your application.)
Again, correct.
With the possibility of using other languages for the M/R functions,
you could, for example, use Python to run the functions and from
within the functions use an HTTP request to get data from another
DB. If you really wanted that. I'd guess though that you'd be better
off with using a database merge with replication or implementing
things on the application level. I might be wrong, though :)
At the moment, we have no plans to add the XMLHTTPRequest
object to our Spidermonkey runtime.
Cheers
Jan
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