Class: Mongoid::Haystack::Index

Inherits:
Object
  • Object
show all
Includes:
Document
Defined in:
lib/mongoid-haystack/index.rb

Class Method Summary collapse

Class Method Details

.add(*args) ⇒ Object 



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# File 'lib/mongoid-haystack/index.rb', line 29

def add(*args)
# we all one or more models to the index..
#
  models_for(*args) do |model|
    config = nil

  # ask the model how it wants to be indexed.  if it does not know,
  # guess.
  #
    if model.respond_to?(:to_haystack)
      config = Map.for(model.to_haystack)
    else
      keywords = []
        %w( keywords title ).each do |attr|
          if model.respond_to?(attr)
            keywords.push(*model.send(attr))
            break
          end
        end

      fulltext = []
        %w( fulltext text content body description to_s ).each do |attr|
          if model.respond_to?(attr)
            fulltext.push(*model.send(attr))
            break
          end
        end

      config =
        Map.for(
          :keywords => keywords,
          :fulltext => fulltext
        )
    end

  # blow up if no sane config was produced
  #
    unless %w( keywords fulltext facets score ).detect{|key| config.has_key?(key)}
      raise ArgumentError, "you need to defined #{ model }#to_haystack"
    end

  # parse the config
  #
    keywords = Array(config[:keywords]).join(' ')
    fulltext = Array(config[:fulltext]).join(' ')
    facets   = Map.for(config[:facets] || {})
    score    = config[:score]

  # find or create an index item for this model
  #
    index =
      Haystack.find_or_create(
        ->{ where(:model => model).first },
        ->{ new(:model => model) },
      )

  # if we are updating an index we need to decrement old token counts
  # before updating it
  #
    if index.persisted?
      Index.subtract(index)
    end

  # add tokens for both keywords and fulltext.  increment counts for
  # both.
  #
    keyword_scores = Hash.new{|h,k| h[k] = 0}
    fulltext_scores = Hash.new{|h,k| h[k] = 0}
    token_ids = []

    values = Token.values_for(keywords)
    tokens = Token.add(values)
    token_index = tokens.inject({}){|hash, token| hash[token.value] = token; hash}
    values.each do |value|
      token = token_index.fetch(value)
      id = token.id
      token_ids.push(id)
      keyword_scores[id] += 1
    end

    values = Token.values_for(fulltext)
    tokens = Token.add(values)
    token_index = tokens.inject({}){|hash, token| hash[token.value] = token; hash}
    values.each do |value|
      token = token_index.fetch(value)
      id = token.id
      token_ids.push(id)
      fulltext_scores[id] += 1
    end

  # our index item is complete with list of tokens, counts of each
  # one, and a facet hash for this model
  #
    index.keyword_scores = keyword_scores
    index.fulltext_scores = fulltext_scores

    index.score = score if score
    index.facets = facets if facets

    index.token_ids = token_ids

    index.save!
  end
end

.models_for(*args, &block) ⇒ Object 



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# File 'lib/mongoid-haystack/index.rb', line 163

def models_for(*args, &block)
  args.flatten.compact.each do |arg|
    if arg.respond_to?(:persisted?)
      model = arg
      block.call(model)
    else
      arg.all.each do |model|
        block.call(model)
      end
    end
  end
end

.remove(*args) ⇒ Object 



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# File 'lib/mongoid-haystack/index.rb', line 134

def remove(*args)
  models_for(*args) do |model|
    index = where(:model_type => model.class.name, :model_id => model.id).first
    index.destroy if index
  end
end

.subtract(index) ⇒ Object 



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# File 'lib/mongoid-haystack/index.rb', line 141

def subtract(index)
  tokens = index.tokens

  counts = {}

  tokens.each do |token|
    keyword_score = index.keyword_scores[token.id].to_i
    fulltext_score = index.fulltext_scores[token.id].to_i

    count = keyword_score + fulltext_score

    counts[count] ||= []
    counts[count].push(token.id)
  end

  counts.each do |count, token_ids|
    Token.where(:id.in => token_ids).inc(:count, -count)
  end

  tokens
end