Module: DynamicSunspotSearch::Translator::BoostRecency

Defined in:
lib/dynamic_sunspot_search/translator/boost_recency.rb

Class Method Summary collapse

Class Method Details

.apply(query_object, options) ⇒ Object

Boost by recency: wiki.apache.org/solr/FunctionQuery#Date_Boosting



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# File 'lib/dynamic_sunspot_search/translator/boost_recency.rb', line 7

def self.apply(query_object, options)
  return unless options.present?
  query_object.tap do |search|
    Array.wrap(options).each do |recency_boost|
      apply_recency_boost(query_object, recency_boost)
    end
  end
end

.apply_recency_boost(query_object, recency_boost) ⇒ Object 



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# File 'lib/dynamic_sunspot_search/translator/boost_recency.rb', line 16

def self.apply_recency_boost(query_object, recency_boost)
  return unless recency_boost.present?
  field = recency_boost.delete(:field)
  half_life = recency_boost.delete(:half_life)
  query_object.tap do |search|
    search.adjust_solr_params do |sunspot_params|
      sunspot_params[:defType] = 'edismax'
      sunspot_params[:boost] = build_boost_string(field, half_life)
    end
  end
end

.build_boost_string(field, half_life) ⇒ Object 



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# File 'lib/dynamic_sunspot_search/translator/boost_recency.rb', line 28

def self.build_boost_string(field, half_life)
  half_life_ms = calculate_half_life_ms(half_life).to_i
  half_life_recip = BigDecimal((1.0/(half_life_ms)).to_s).to_s('E').downcase
  "recip(ms(NOW,#{field.to_s}_dt),#{half_life_recip},100,1)"
end

.calculate_half_life_ms(options) ⇒ Object 



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# File 'lib/dynamic_sunspot_search/translator/boost_recency.rb', line 34

def self.calculate_half_life_ms(options)
  options.reduce(0) do |half_life_ms, (period, value)|
    half_life_ms += value.to_f.send(period.to_sym).to_i*1000
  end
end