active?

is_active.rb

# # #
# If you pass:
#  - String, then it highlight for that controller name
#  - Array, then it will highlight for those actions
#  - Hash, then it will highlight for only those controller and action combinations
#
def is_active?(controller_action_hash_or_array_or_string)
  controller = params[:controller]
  action = params[:action]

  controller_action_hash =
    case controller_action_hash_or_array_or_string
    when Array
      { controller => controller_action_hash_or_array_or_string }
    when String
      { controller_action_hash_or_array_or_string => nil }
    when Hash
      controller_action_hash_or_array_or_string
    else
      raise ArgumentError, "what are you even ..."
    end

  controller_action_hash = Hash[controller_action_hash.map{|k,v| [k, [v || action].flatten]}]

  "active" if controller_action_hash.key?(controller) && controller_action_hash[controller].include?(action)
end