Class: SearchResultsController

Inherits:
ApplicationController show all
Includes:
DatasetInitialization
Defined in:
app/controllers/search_results_controller.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods included from DatasetInitialization

#datasets_as_json, #init_datasets

Class Method Details

.prepare_basic_variables(controller) ⇒ Object 



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# File 'app/controllers/search_results_controller.rb', line 160

def self.prepare_basic_variables(controller)
  langs = Iqvoc.all_languages.each_with_object({}) do |lang, hsh|
    lang ||= 'none'
    hsh[lang] = I18n.t("languages.#{lang}", default: lang)
  end
  controller.instance_variable_set(:@available_languages, langs)

  collections = Iqvoc::Collection.base_class.includes(:pref_labels).load
  controller.instance_variable_set(:@collections, collections)
end

Instance Method Details

#index ⇒ Object 



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# File 'app/controllers/search_results_controller.rb', line 66

def index
  authorize! :read, Concept::Base
  # TODO: requires a dedicated :search permission because this covers more
  # than just concepts

  self.class.prepare_basic_variables(self)

  # Map short params to their log representation
  { t: :type,
    q: :query,
    l: :languages,
    qt: :query_type,
    c: :collection_origin,
    ds: :datasets }.each do |short, long|
    params[long] ||= params[short]
  end

  # Select first type by default
  params[:type] = Iqvoc.searchable_classes.first.name.parameterize unless params[:type]

  # Delete parameters which should not be included into generated urls (e.g.
  # in rdf views)
  request.query_parameters.delete('commit')
  request.query_parameters.delete('utf8')

  @datasets = init_datasets

  @remote_result_collections = []

  if params[:query]
    # Deal with language parameter patterns
    languages = []
    # Either "l[]=de&l[]=en" as well as "l=de,en" should be possible
    if params[:languages].respond_to?(:each) && params[:languages].include?('none')
      # Special treatment for the "nil language"
      languages << nil
    elsif params[:languages].respond_to?(:split)
      languages = params[:languages].split(',')
    end

    # Ensure a valid class was selected
    unless klass = Iqvoc.searchable_class_names.detect { |key, value| value == params[:type] }.try(:first)
      raise "'#{params[:type]}' is not a searchable class! Must be one of " + Iqvoc.searchable_class_names.keys.join(', ')
    end
    klass = klass.constantize

    query_size = params[:query].split(/\r\n/).size

    if klass.forces_multi_query? || (klass.supports_multi_query? && query_size > 1)
      @multi_query = true
      @results = klass.multi_query(params.merge({ languages: languages }))
      # TODO: Add a worst case limit here; e.g. when on page 2 (per_page == 50)
      # each sub-query has to return 100 objects at most.
      @klass = klass
    else
      @multi_query = false
      @results = klass.single_query(params.merge({ languages: languages }))
    end

    if @multi_query
      @results = Kaminari.paginate_array(@results)
      logger.debug('Using multi query mode')
    else
      logger.debug('Using single query mode')
    end

    if params[:limit] && Iqvoc.unlimited_search_results
      @results = @results.per(params[:limit].to_i)
    end

    if params[:datasets] && datasets = @datasets.select { |a| params[:datasets].include?(a.name) }
      @results = SearchResultCollection.new(@results)
      datasets.each do |dataset|
        results = dataset.search(params)
        if results
          @results = @results + results
        else
          flash.now[:error] ||= []
          flash.now[:error] << t('txt.controllers.search_results.remote_source_error', source: dataset)
        end
      end
      @results = @results.sort { |x, y| x.to_s <=> y.to_s }
    end

    @results = Kaminari.paginate_array(@results)
    @results = @results.page(params[:page])

    respond_to do |format|
      format.html { render :index, layout: with_layout? }
      format.any(:ttl, :rdf, :nt)
    end
  end
end