Module: Noodall::Search::ClassMethods

Defined in:
lib/noodall/search.rb

Instance Method Summary collapse

Instance Method Details

#language(lang = 'en') ⇒ Object 



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# File 'lib/noodall/search.rb', line 25

def language(lang = 'en')
  @language ||= lang
end

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



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# File 'lib/noodall/search.rb', line 33

def search(query, options = {})
  if options[:per_page] || options[:per_page]
    per_page      = options.delete(:per_page)
    page          = options.delete(:page)
  end
  plucky_query = query(options.reverse_merge(
    :order => 'relevance DESC'
  ))
  criteria = plucky_query.criteria.to_hash
  options = plucky_query.options.to_hash

  # Extract words from the query and clean up
  words = query.to_s.downcase.split(/\W/) - STOPWORDS
  words.reject!{|w| w.length < 3}

  # add stemmed words to the array of words
  words = stem(words) | words

  criteria.merge!( :_keywords => { :$in => words } )

  # The Search result
  search_result = collection.map_reduce(search_map(words), search_reduce, :query => criteria, :out => "#{self.collection_name}_search")

  # Add value to sort options because model is stored in the value key
  options[:sort].map! do |s,v|
    ["value.#{s}",v]
  end

  search_query = Plucky::Query.new(search_result, options)

  if per_page
    results = search_query.paginate(:per_page => per_page, :page => page)
  else
    results = search_query.all
  end
  #return results mappped to objects
  results.tap do |docs|
    docs.map! { |hash| load(hash['value']) }
  end
end

#search_finalize ⇒ Object 



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# File 'lib/noodall/search.rb', line 96

def search_finalize
  "function( key , values ){return values.model;}"
end

#search_map(words) ⇒ Object 



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

def search_map(words)
  #convert words into Regex OR
  q = words.map do |k|
    Regexp.escape(k)
  end.join("|")
  "function(){" +
    "this.relevance = this._keywords.filter(" +
    "function(z){" +
    "return String(z).match(/(#{q})/i);" +
    "}).length;" +
    "emit(this._id, this);" +
    "}"
end

#search_reduce ⇒ Object 



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# File 'lib/noodall/search.rb', line 92

def search_reduce
  "function( key , values ){return values[0];}"
end

#searchable_keys(*keys) ⇒ Object 



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# File 'lib/noodall/search.rb', line 18

def searchable_keys(*keys)
  @searchable_keys ||= Set.new
  @searchable_keys += keys

  @searchable_keys
end

#stem(words) ⇒ Object 



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# File 'lib/noodall/search.rb', line 74

def stem(words)
  words.map { |word| stemmer.stem(word) }
end

#stemmer ⇒ Object 



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# File 'lib/noodall/search.rb', line 29

def stemmer
  @stemmer ||= Lingua::Stemmer.new(:language => language)
end