On 2010-10-12 15:09, Anand Chitipothu wrote:
Is it possible to count the number of unique values by writing a couchdb view?
Consider the following 2 docs.
{
"_id": "posts/1",
"title": "post 1",
"tags": ["foo", "bar"]
}
{
"_id": "posts/2",
"title": "post 2",
"tags": ["foo", "foobar"]
}
Is it possible to find that there are 3 tags?
Yes. Just write a map function that emits all tags it finds (not checked
and probably wrong):
function(doc) {
for(tag in doc.tags) {
emit(tag, null);
}
}
In the reduce-function, just use _count
(http://wiki.apache.org/couchdb/Built-In_Reduce_Functions).
Regards,
Michael.
