How to run JavaScript function in before_save filter to replace some value before saving into database?

Question

I have categoried, which user choose. If user choose 'Auto' I need to replace it with result, what gives me my JavaScript function - setting default browser language.

Here is JavaScript example, of JS function - http://fiddle.jshell.net/xCgsb/

And here is my before_save filter in Website model:

before_save :auto_language

def create
 website = current_user.websites.new params[:website]
 if @website.language == "Auto"
  @website.language = request.env['HTTP_ACCEPT_LANGUAGE'].scan(/^[a-z]{2}/).first
 end
...
#error
undefined local variable or method `request' for #<Website:0x244e1b0>

Can someone help me with this trouble ? Any help appreciated.

Answer 1

You should not be using Javascript to set up your default locale.

Take a look at this:

http://guides.rubyonrails.org/i18n.html#setting-the-locale-from-the-client-supplied-information

They use Ruby to detect the locale

def set_locale
   logger.debug "* Accept-Language: #{request.env['HTTP_ACCEPT_LANGUAGE']}"
   I18n.locale = extract_locale_from_accept_language_header
   logger.debug "* Locale set to '#{I18n.locale}'"
end  

private

def extract_locale_from_accept_language_header
    request.env['HTTP_ACCEPT_LANGUAGE'].scan(/^[a-z]{2}/).first
end

If you want to get the full language, you can use a switch case:

def full_language_name(lang) 
  case lang
    when 'ru'
      return 'Russian'
    when 'en'
      return 'English'
    when 'fr'
      return 'French'
    else
      return 'English'
end

The 'else' case is the default behavior if none of these conditions has been verified. The keyword 'return' is optional.

Hope this helps!