Module: MongoMapper::Search::ClassMethods

Defined in:
lib/mongomapper_search/search.rb

Instance Method Summary collapse

Instance Method Details

#idf(field, term, total) ⇒ Object 



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# File 'lib/mongomapper_search/search.rb', line 86

def idf(field, term, total)
  df = where(field => /#{term}/ ).count
  if df != 0
    Math.log(total/df)
  else
    0
  end
end

#index_keywords! ⇒ Object

Goes through all documents in the class that includes Mongoid::Search and indexes the keywords.



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# File 'lib/mongomapper_search/search.rb', line 136

def index_keywords!
  all.each { |d| d.index_keywords! }
end

#search(query, options = {}, criteria = {}) ⇒ Object 



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# File 'lib/mongomapper_search/search.rb', line 95

def search(query, options={}, criteria = {})
  return all(criteria) if query.blank? && (options[:allow_empty_search] || allow_empty_search)
  
  keywords = Util.normalize_keywords(query, stem_keywords)

  unique_keywords = keywords.uniq
  
  regexed_keywords = []
                  
  unique_keywords.each do |keyword|
    regexed_keywords.concat([/#{keyword}/])
  end
   
  search_match = options[:match]||self.match

  total = all.count

  results = []
  self.search_fields.each do |key, value|
    if key.class == Hash
      key.each do |sub_key, sub_value|
        field = "_#{sub_key}_#{sub_value}".to_sym
        search_a_field search_match, field, regexed_keywords, results, value, unique_keywords, total, criteria
      end
    else
      field = "_#{key}".to_sym
      search_a_field search_match, field, regexed_keywords, results, value, unique_keywords, total, criteria
    end
  end

  results.sort { |a,b| b.rank <=> a.rank }
  documents = []
  results.each do |result|
    documents << result.document
  end

  documents
end

#search_a_field(search_match, field, regexed_keywords, results, boost, terms, total, criteria) ⇒ Object 



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# File 'lib/mongomapper_search/search.rb', line 55

def search_a_field(search_match, field, regexed_keywords, results, boost, terms, total, criteria)
  if search_match == :all
    field_results = where(criteria).where(field => { "$all" => regexed_keywords })
  elsif search_match == :any
    field_results = where(criteria).where(field => regexed_keywords )
  end
  field_results.each do |field_result|
    result = RankedDocument.new(field_result)
    rank = 0
    terms.each do |term|
      rank += boost * tf_idf(field, term, result.document[field], total)
    end

    if !results.include?(result)
      result.rank = rank
      results << result
    else
      i = results.index result
      results[i].rank += rank
    end
  end
end

#search_in(*args) ⇒ Object 



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# File 'lib/mongomapper_search/search.rb', line 20

def search_in(*args)
  options = args.last.is_a?(Hash) && [:allow_empty_search, :stem_keywords].include?(args.last.keys.first) ? args.pop : {}
  self.match              = [:any, :all].include?(options[:match]) ? options[:match] : :any
  self.allow_empty_search = [true, false].include?(options[:allow_empty_search]) ? options[:allow_empty_search] : false
  self.stem_keywords      = [true, false].include?(options[:stem_keywords]) ? options[:allow_empty_search] : false
  self.search_fields      = self.search_fields || {}
  
  args.each do |arg|
    if arg.class == Hash
      arg.each do |key, value|
        if key.class == Hash
          key.each do |sub_key, sub_value|
            field = "_#{sub_key}_#{sub_value}".to_sym
            key field, Array
            ensure_index field, :background => true
            self.search_fields[key] = value
          end
        else
          field = "_#{key}".to_sym
          key field, Array
          ensure_index field, :background => true
          self.search_fields[key] = value
        end
      end
    else
        field = "_#{arg}".to_sym
        key field, Array
        ensure_index field, :background => true
        self.search_fields[arg] = 1
    end
  end
        
  before_save :set_keywords
end

#tf(term, terms) ⇒ Object 



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# File 'lib/mongomapper_search/search.rb', line 82

def tf(term, terms)
  terms.count(term)
end

#tf_idf(field, term, terms, total) ⇒ Object 



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# File 'lib/mongomapper_search/search.rb', line 78

def tf_idf(field, term, terms, total)
  tf(term, terms) * idf(field, term, total)
end