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=red
your 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 Krämer
Finkenlust 14, 06449 Aschersleben, Germany
VAT Id DE251962952
http://www.jkraemer.net/ - Blog
http://www.omdb.org/ - The new free film database
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