First, I''d like to thank you all for your patience and help on the "Document Scores" issue :). Now, I have a bit of a "noob" question... Is there a way to apply multiple filters to the same query? For example, I want to apply both a RangeFilter and a QueryFilter, but from what I''ve seen in the API docs, the :filter parameter that can be passed to the Searcher accepts only one filter. It does mention the possibility of applying filters to each other, but provides no examples. Is this possible? How can it be done? -- Bira http://compexplicita.wordpress.com http://compexplicita.tumblr.com
I am having the same problem.
I cannot figure out how to get filters working using options for
Index::Index search.
http://ferret.davebalmain.com/api/classes/Ferret/Index/Index.html#M000022
For example suppose I am trying to run the following query:
Search for "frog" filtering on color=green or color=red
----------------------
I have tried the following with no success:
## Search for "frog"
t = TermQuery.new(:content, "frog")
b = BooleanQuery.new(t,:should)
## Filter on color=(green OR red)
t1 = TermQuery.new(:color,"red")
t2 = TermQuery.new(:color,"green")
b1 = BooleanQuery.new
b1.add_query(t1,:should)
b1.add_query(t2,:should)
b2 = BooleanQuery.new
b2.add_query(b1,:must)
## merge query and filter
b.add_query(FilterQuery.new(b2),:must)
## setup index
index = Index::Index.new(:path => @index_dir)
## search
@result = index.search(b, options={})
----------------------
This last line causes the following error:
ruby(534,0xa06fdfa0) malloc: *** error for object 0x4c1a21: Non-
aligned pointer being freed
*** set a breakpoint in malloc_error_break to debug
ruby(534,0xa06fdfa0) malloc: *** error for object 0x7038: Non-aligned
pointer being freed
*** set a breakpoint in malloc_error_break to debug
label:president content:president +
limit10offset0
--- Entering query execution ---
/Library/Ruby/Gems/1.8/gems/ferret-0.11.6/lib/ferret/index.rb:768:
[BUG] Segmentation fault
ruby 1.8.6 (2007-09-24) [universal-darwin9.0]
Abort trap
----------------------
???
Benjamin
On Feb 28, 2008, at 4:23 AM, Bira wrote:
> First, I''d like to thank you all for your patience and help on the
> "Document Scores" issue :).
>
> Now, I have a bit of a "noob" question... Is there a way to apply
> multiple filters to the same query? For example, I want to apply both
> a RangeFilter and a QueryFilter, but from what I''ve seen in the
API
> docs, the :filter parameter that can be passed to the Searcher accepts
> only one filter. It does mention the possibility of applying filters
> to each other, but provides no examples.
>
> Is this possible? How can it be done?
>
> --
> Bira
> http://compexplicita.wordpress.com
> http://compexplicita.tumblr.com
> _______________________________________________
> Ferret-talk mailing list
> Ferret-talk at rubyforge.org
> http://rubyforge.org/mailman/listinfo/ferret-talk
>
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Hi! On Sat, Mar 01, 2008 at 09:29:39PM -0800, Benjamin Arai wrote:> I am having the same problem. > > I cannot figure out how to get filters working using options for > Index::Index search. > > http://ferret.davebalmain.com/api/classes/Ferret/Index/Index.html#M000022 > > For example suppose I am trying to run the following query: > > Search for "frog" filtering on color=green or color=redyour problem most probably results from improper API usage. That shouldn''t be a reason for Ferret to segfault, but that''s another story. The QueryFilter class is a filter, and not a query, and you can''t add a filter to a boolean query. Instead, build a FilteredQuery to combine your original query with the filter. Here''s a snippet that achieves what you want: require ''rubygems'' require ''ferret'' include Ferret include Ferret::Search i = I.new i << {:color => ''green'', :content => ''frog''} i << {:color => ''red'', :content => ''frog''} i << {:color => ''blue'', :content => ''frog''} # Search for "frog" t = TermQuery.new(:content, "frog") # Filter on color=(green OR red) t1 = TermQuery.new(:color,"red") t2 = TermQuery.new(:color,"green") b1 = BooleanQuery.new b1.add_query(t1,:should) b1.add_query(t2,:should) filter = QueryFilter.new(b1) filtered_query = FilteredQuery.new(t, filter) puts i.search(filtered_query)> >Now, I have a bit of a "noob" question... Is there a way to apply > >multiple filters to the same query? For example, I want to apply both > >a RangeFilter and a QueryFilter, but from what I''ve seen in the API > >docs, the :filter parameter that can be passed to the Searcher accepts > >only one filter. It does mention the possibility of applying filters > >to each other, but provides no examples. > > > >Is this possible? How can it be done?Build FilteredQueries like above and chain them together: i << {:color => ''red green'', :content => ''frog''} # Search for "frog" t = TermQuery.new(:content, "frog") # Filter on color=red f1 = QueryFilter.new(TermQuery.new(:color,"red")) # Filter on color=green f2 = QueryFilter.new(TermQuery.new(:color,"green")) fq1 = FilteredQuery.new(t, f1) fq2 = FilteredQuery.new(fq1, f2) puts i.search(fq2) Cheers, Jens -- Jens Kr?mer Finkenlust 14, 06449 Aschersleben, Germany VAT Id DE251962952 http://www.jkraemer.net/ - Blog http://www.omdb.org/ - The new free film database