module AbstractController::Helpers::Resolution

def modules_for_helpers(modules_or_helper_prefixes)
  modules_or_helper_prefixes.flatten.map! do |module_or_helper_prefix|
    case module_or_helper_prefix
    when Module
      module_or_helper_prefix
    when String, Symbol
      helper_prefix = module_or_helper_prefix.to_s
      helper_prefix = helper_prefix.camelize unless helper_prefix.start_with?(/[A-Z]/)
      "#{helper_prefix}Helper".constantize
    else
      raise ArgumentError, "helper must be a String, Symbol, or Module"
    end
  end
end