> Then, I create a view to store the documents for each tag:
>
> function(doc) {
> for(var idx in doc.tags) {
> emit(doc.tags[idx], doc);
> }
> }
>
> and eventually I can make a POST request using the keys parameter in order
> the retrieve all the documents that have one or more of the given tags.
> The problem is that I don't know how to sort the result by the field
> created_at and I can't use it in the emit function within the key as I will
> not know the value for it (and the documents can different values for it)
>
> Any idea how to achieve this?
Change your view function to emit both tag and created_at.
function (doc) {
for (var i in doc.tags) {
emit([doc.tags[i], doc.created_at], null);
}
}
Also notice that you don't have to emit the doc. It can be included in
the result by adding "include_docs=true" to your query string.
Use the following request to get all documents, matching a tag.
http://localhost:5984/<dbname>/_design/<design-doc-name>/<viewname>?start_key=["mytag"]&end_key=["mytag",
{}]&include_docs=true
If you want the most recent doc first, try adding descending=true and
swap start_key and end_key.
I'm not sure if there is any straight-forward way to query for more
than one tag. You can probably achieve that by making your view
function emit all possible combinations of tags in the document.
Anand
