To pull that off you'd need to have every single combination
of tags in the index which I don't see happening. Maybe
with the reduce, I don't know.
what you can do is emit([tag1, tag2], null); and then query
with key=[tag1, tag2]]; and that would work the octopus
and hockey-case you line out here, but not in general.
Cheers
Jan
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On Jul 3, 2008, at 15:52, Brad King wrote:
Might be a hack, but would a collated view work for getting two
arbitrary tags?
function (doc) {
for(var i=0; i<doc.Tags.length; i++)
emit([doc.Tags[i], doc.Tags[i]], null);
then you pass in ?key=["octopus","hockey"]
On Thu, Jul 3, 2008 at 9:15 AM, Jan Lehnardt <[EMAIL PROTECTED]> wrote:
On Jul 3, 2008, at 15:01, Bradford Winfrey wrote:
Hello everyone, been stalking the mailing list for a while and
thought
this might be worthy of a post as I was asked to solve it, yet, I
couldn't!
Let's take the classic blog example document with the following
fields/values:
"_id": "1f2fc3955b91aed5e7369f0b0ba8214e",
"_rev": "1226709986",
"Author": "Bradford",
"Type": "Post",
"Body": "Just mentioning this for a sample blog post.",
"PostedDate": "2008-07-02T23:22:12-04:00",
"Subject": "My Fine Blog Post",
"Tags": ["octopus","hockey","squidward","bradford","recreation"]
Next, I'd like to find each blog post that contains ANY of the
following
tags ["octopus","hockey"]. Now, generally speaking this isn't so
bad. We
could write a simple view:
function (doc) {
if (doc.Type == 'Post') {
for (var i = 0;i < doc.tags.length; i++) {
emit(doc.tags[i],doc);
}
}
}
We would get back each one of our tags as a key, yea? Only if we
supplied
one at a time. So how does one go about supplying a range, array
(not sure
what we'd call it here) of keys to be searched on?
http://...?key=["octopus","hockey";] maybe? I'm unsure of the plan
of
attack for such a thing. Maybe I'm just going about it in the wrong
direction. Any thoughts?
have a look at the bottom of http://wiki.apache.org/couchdb/HttpViewApi
for the view query options. Specifically the startkey= and endkey=
ones.
Note that you only get consecutive ranges with that. To retrieve
arbitrary
tags, you'd need to run a query per tag with the key= option.
Cheers
Jan
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