def current_clearance_levels
        # Notify deprecation of `current_clearance_level` (singular)
        if defined? current_clearance_level
          ActiveSupport::Deprecation.warn \
            '[Action Access] The use of "current_clearance_level" '   +
            'is going to be deprecated in the next release, rename ' +
            'it to "current_clearance_levels" (plural).'
          return current_clearance_level
        end

        if defined?(current_user) and current_user.respond_to?(:clearance_levels)
          current_user.clearance_levels
        else
          :guest
        end
      end
def current_clearance_levels
        # Notify deprecation of `current_clearance_level` (singular)
        if defined? current_clearance_level
          ActiveSupport::Deprecation.warn \
            '[Action Access] The use of "current_clearance_level" '   +
            'is going to be deprecated in the next release, rename ' +
            'it to "current_clearance_levels" (plural).'
          return current_clearance_level
        end

        if defined?(current_user) and current_user.respond_to?(:clearance_levels)
          current_user.clearance_levels
        else
          :guest
        end
      end
Current user's clearance levels (override to customize).