class Array

def to_s(format = NOT_SET) # :nodoc:
  case format
  when :db
    ActiveSupport::Deprecation.warn(
      "Array#to_s(#{format.inspect}) is deprecated. Please use Array#to_fs(#{format.inspect}) instead."
    )
    if empty?
      "null"
    else
      collect(&:id).join(",")
    end
  when NOT_SET
    to_default_s
  else
    ActiveSupport::Deprecation.warn(
      "Array#to_s(#{format.inspect}) is deprecated. Please use Array#to_fs(#{format.inspect}) instead."
    )
    to_default_s
  end
end