Ferret talk - Sep 2007 - multi_score?

Hi!

I''m using acts_as_ferret in my rails project and i need to order the
search results by a combination of the result given by ferret (score)
and a ranking in the database (normalized also). this combination can be
like that:

0.4*ferret_score+0.6*database_score

this database_score is also indexed
any idea?


and someone know how to access the ferret data in the object returned by
find_by_content in aaf?

thanks in advance!
Jos? Valim.
-- 
Posted via http://www.ruby-forum.com/.

On Fri, Sep 21, 2007 at 03:44:24AM +0200, Jos? Valim
wrote:
> Hi!
> 
> I''m using acts_as_ferret in my rails project and i need to order
the
> search results by a combination of the result given by ferret (score)
> and a ranking in the database (normalized also). this combination can be
> like that:
> 
> 0.4*ferret_score+0.6*database_score
> 
> this database_score is also indexed
> any idea?
Probably the easiest way to achieve this is to use your ranking as a
document specific boost (available in current trunk):

acts_as_ferret :fields => { ... }, :boost => :normalized_ranking

That way your ranking will directly affect the score Ferret calculates.
Useful values for boosts in the index are 0..255, you''ll have to
experiment a bit to see what boosts work best for you.
> and someone know how to access the ferret data in the object returned by
> find_by_content in aaf?
what do you mean by ferret data? You may access the score Ferret
assigned to a specific result with the ferret_score method.

cheers,
Jens

-- 
Jens Kr?mer
http://www.jkraemer.net/ - Blog
http://www.omdb.org/     - The new free film database

> what do you mean by ferret data?
My aaf is like that:

  acts_as_ferret :fields => {
                              :title => {:boost => 3},
                              :url => {:boost => 1},
                              :content => {:boost => 2, :stored => 
true},
                              :keywords => {:boost => 0}
                  }, :remote => true  # use ferret_server specified in

Only content is not an ActiveRecord attribute, it''s a method.
So, when i get the results of ferret and do:

results.each |result| do
  result.content
end

It brings me nothing. I wish I could access the ''content''
which is in
ferret index.

Thanks Jens for you reply.
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Posted via http://www.ruby-forum.com/.

Oh, i''ve found why i can''t get the fields.
I should use the key :store => :yes
And not :store => true.
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