Software Público Brasileiro

== Future

If in the future you're considering to make use of weight and ranking on
the search, you might use the pg_search lib:

https://github.com/Casecommons/pg_search/tree/0.2-stable

Here is how it would be done:

== lib/pg_search_plugin.rb

searchables = %w[ article comment qualifier national_region certifier profile license scrap category ]
searchables.each { |searchable| require_dependency searchable }
klasses = searchables.map {|searchable| searchable.camelize.constantize }

klass.class_eval do
  include PgSearch
  pg_search_scope :pg_search_plugin_search,
                  :against => klass::SEARCHABLE_FIELDS.keys,
                  :using => { :tsearch => {:prefix => true, :tsvector_column => 'pg_search_plugin_tsv' } }
end

==

You also would want to add the adequate indexes to the this searches. Here is
an example with the profiles table:

== db/migrate/000_create_indexes_for_profile_search.rb

class CreateTsvIndexesForProfile < ActiveRecord::Migration
  def self.up
    execute "ALTER TABLE profiles ADD COLUMN pg_search_plugin_tsv tsvector"
    fields = Profile::SEARCHABLE_FIELDS.map {|field, weight| "to_tsvector('simple', coalesce(\"profiles\".\"#{field}\", ''))"}.join(' || ')
    execute <<-QUERY
    UPDATE profiles SET pg_search_plugin_tsv = (#{fields});
    QUERY

    triggers = "pg_search_plugin_tsv, 'pg_catalog.simple', "
    triggers += Profile::SEARCHABLE_FIELDS.keys.join(', ')
    execute "CREATE TRIGGER pg_search_plugin_profiles_tsvectorupdate BEFORE INSERT OR UPDATE
             ON profiles FOR EACH ROW EXECUTE PROCEDURE
             tsvector_update_trigger(#{triggers});"
  end

  def self.down
    execute "drop trigger pg_search_plugin_profiles_tsvectorupdate on profiles"
    execute "alter table profiles drop column pg_search_plugin_tsv"
  end
end

==