Module: MongoidExt::Filter::ClassMethods

Defined in:
lib/mongoid_ext/filter.rb

Instance Method Summary collapse

Instance Method Details

#_build_filter_query(parsed_query) ⇒ Object 



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# File 'lib/mongoid_ext/filter.rb', line 87

def _build_filter_query(parsed_query)
  mongoquery = {}

  if !parsed_query[:tokens].empty?
    keywords = []

    parsed_query[:tokens].each do |t|
      keywords << /^#{Regexp.escape(t)}/i if t.size > 2
    end

    mongoquery[:_keywords] = { :$in => keywords }
  end

  mongoquery.merge!(map_filter_operators(parsed_query[:quotes], parsed_query[:operators]))

  mongoquery
end

#filter(query, opts = {}) ⇒ Object 



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# File 'lib/mongoid_ext/filter.rb', line 48

def filter(query, opts = {})
  min_score = opts.delete(:min_score) || 0.0
  limit = opts.delete(:per_page) || 25
  page = opts.delete(:page) || 1
  select = opts.delete(:select) || self.fields.keys

  parsed_query, conds = self.filter_conditions(query, opts)
  query = Mongoid::Criteria.new(self)
  conds = query.where(opts).where(conds).selector

  retval = Mongoid.session(:default).command({
    :eval => "function(collection, q, config) { return filter(collection, q, config); }", 
    :args => [
      self.collection_name, 
      conds, 
      {
        :words => parsed_query[:words].to_a, 
        :stemmed => parsed_query[:stemmed].to_a, 
        :limit => limit, 
        :min_score => min_score, 
        :select => select 
      }
    ]
  })['retval']
  results = retval['results']

  pagination = MongoidExt::Filter::ResultSet.new(retval["total_entries"], parsed_query, conds, page, limit)

  pagination.subject = results.map do |result|
    item = self.new(result['doc'])
    item.id = result['doc']['_id']
    item.search_score = result['score']

    item
  end

  pagination
end

#filter_conditions(query, opts = {}) ⇒ Object 



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# File 'lib/mongoid_ext/filter.rb', line 34

def filter_conditions(query, opts = {})
  stemmer = nil
  language = opts.delete(:language) || 'en'

  if defined?(Lingua::Stemmer)
    stemmer = MongoidExt::Filter.build_stemmer(language)
  end

  @parser = MongoidExt::Filter::Parser.new(stemmer)
  parsed_query = @parser.parse(query)

  [parsed_query, _build_filter_query(parsed_query)]
end

#filterable_keys(*keys) ⇒ Object 



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# File 'lib/mongoid_ext/filter.rb', line 23

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

  @filterable_keys
end

#language(lang = 'en') ⇒ Object 



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# File 'lib/mongoid_ext/filter.rb', line 30

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

#map_filter_operators(quotes, ops) ⇒ Object 



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# File 'lib/mongoid_ext/filter.rb', line 105

def map_filter_operators(quotes, ops)
  mongoquery = {}

  if ops["is"]
    ops["is"].each do |d|
      mongoquery[d] = true
    end
  end

  if ops["not"]
    ops["not"].each do |d|
      mongoquery[d] = false
    end
  end

  mongoquery
end