On Oct 27, 2009, at 10:50 AM, Alex P wrote:
i know this is currently unsupported (and may be more of a question
for the
dev list), but is there a technical reason while multi-range queries
can't
be submitted to couch (slight ah-hah moment at the end)?
the specific problem i'm trying to address is this:
suppose i have a message document, and a corresponding map function:
function (doc) {
if (doc.docType != 'message') return;
emit(doc.owner, null);
}
if i wanted to pull back all messages for users foo and bar, i'd
simply do a
POST path/to/couch keys = ['foo', 'bar']. now let's make this data
come back
sorted by create date:
function (doc) {
if (doc.docType != 'message') return;
emit([doc.owner, doc.createDate], null);
}
also cool, but now, to retrieve all messages pertaining to a single
user, i
need to do GET path/to/couch startKey=['foo']&endKey=['foo', 'a'].
this
works, but it now means that if i want all messages pertaining to
both foo
and bar, i need to run two separate queries.
as i'm writing this, i think i'm starting to see that the problem
would be
with having to merge overlapping ranges, but i still would like
someone else
to weigh in on this
thanks,
alex.
Hi Alex, internally, multiple keys are actually just a special case of
multiple ranges. So that part is easy. We would want to be clear
about how we handle overlapping ranges, but it's not that hard of a
problem really.
I wonder what the HTTP call for this should look like?
Adam
