So, you want to display 5 results from each category and still know
how many results are in each category. This is a perfect situation
for the field collapsing patch:
https://issues.apache.org/jira/browse/SOLR-236
http://wiki.apache.org/solr/FieldCollapsing
Here is how I would do it.
Add a field to your schema called category or whatever. Then while
indexing you populate that field with whatever category the document
belongs in. While executing a search, collapse the results on that
field with a max collapse of 5. This will give you at most 5 results
per category. Now, at the same time enable faceting on that field and
DO NOT use the collapsing parameter to recount the facet vales. This
means that the facet counts will be reflect the non-collapsed
results. This facet should only be used to get the count for each
category, not displayed to the user. On your search results page that
gets the collapsed results, you can put a link that says "Show all X
results from this category" where X is the value you pull out of the
facet. When a user clicks that link you basically do the same search
with field collapsing disabled, and a filter query on the specific
category they want to see, for example: &fq=category:people.
Hope this helps.
Thanks,
Matt Weber
On Sep 29, 2009, at 4:55 AM, Marian Steinbach wrote:
On Tue, Sep 29, 2009 at 11:36 AM, Varun Gupta
<varun.vgu...@gmail.com> wrote:
...
One way that I can think of doing this is by making as many queries
as there
are categories and show these results under each category. But this
will be
very inefficient. Is there any way I can do this ?
Hi Varun!
I think that doing multiple queries doesn't have to be inefficient,
since Solr caches subsequent queries for the same term and facets.
Imagine this as your first query:
- q: xyz
- facets: myfacet
and this as a second query:
- q:xyz
- fq: myfacet=a
Compared to the first query, the second query will be very fast, since
all the hard work ahs been done in query one and then cached.
At least that's my understanding. Please correct me if I'm wrong.
Marian
