ontohub/ontohub

#
# Lists symbols of an ontology
#
class SymbolsController < InheritedResources::Base

  belongs_to :ontology
  before_filter :check_read_permissions

  actions :index, :show
  has_scope :kind
  has_pagination

  respond_to :html

  def index
    ontology = Ontology.find params[:ontology_id]

    if ontology && (ontology.is?('OWL2') || ontology.is?('OWL'))
      begin
        symbols = ontology.symbol_groups
        request = <<-SQL
          id NOT IN (SELECT DISTINCT(parent_id) FROM e_edges
           UNION SELECT DISTINCT(child_id) FROM e_edges)
        SQL
        roots_without_children = ontology.symbol_groups.where(request)
        @nodes = SymbolGroup.roots_of(*symbols)
        @nodes += roots_without_children
      rescue
        @nodes = []
      end
      @hierarchy_exists = !@nodes.empty?
    end

    @page_selected = !! params[:page]

    index! do |format|
      format.html do
        unless collection.blank?
          first_symbol = collection.first
          @show_name_column =
            !(first_symbol.display_name ||
            first_symbol.text.include?(first_symbol.name))
        end
      end
    end
  end

  protected

  def check_read_permissions
    authorize! :show, parent.repository
  end
end