Assign default options, such as ‘index’ as a default for :action. This method must be run after user supplied requirements and defaults have been applied to the segments.

Source Code

# File action_controller/routing/builder.rb, line 123
def assign_default_route_options(segments)
  segments.each do |segment|
    next unless segment.is_a? DynamicSegment
    case segment.key
      when :action
        if segment.regexp.nil? || segment.regexp.match('index').to_s == 'index'
          segment.default ||= 'index'
          segment.is_optional = true
        end
      when :id
        if segment.default.nil? && segment.regexp.nil? || segment.regexp =~ ''
          segment.is_optional = true
        end
    end
  end
end