On 6/23/06, Trent Steele <[EMAIL PROTECTED]> wrote:
> Hello all
>
> I'm using Ferret for a site wide search where I have several kinds of
> (similar) objects in a central index (using a "type" field containing
> the class name). This works great, and I can search all objects with one
> query.
>
> What I'd like to do now is to limit the results so that there will be a
> maximum of 10 (or 5 or whatever) results for each type.. I can't figure
> out how to do this, so I thought maybe someone brighter than me has done
> this before or knows how to do it? :)
>
> Trent Steele
Hi Trent,
The way to do this is to search for more than you need and then
actually go through each search result and count the types in a hash,
only adding a doc if it's type count is under the threshold. If you
failed to retrieve enough results then search again and repeat until
you get the required number of results. For those of you who know the
Lucene API, this is where a Hits class comes in handy. It'll be coming
in a future version. For now I'll show you the easiest wat by doing a
search and setting :num_docs to max_doc, thereby getting all search
results in one go;
def get_results(search_str, max_type = 5, num_required = 10)
type_counter = Hash.new(0)
results = []
index.search_each(search_str, :num_docs => index.size) do
|doc_id, score|
doc = index[doc_id]
if type_counter[doc[:type]] < max_type
results << doc
type_counter[doc[:type]] += 1
end
break if results.size >= num_required
end
return results
end
Hope that helps,
Dave
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