redirect_to : pass all parameters

On filmamora we redirect people to the language version we think they want. This is done with a subdomain for the language.
As if that wasn't painful enough, it now seems I was stripping out additional parameters - like the parameters passed in from our mailings that triggered Google Analytics campaigns.
Doh!

So this:

  def language_redirect
    redirect_to :subdomain => session[:language] unless RAILS_ENV == 'staging'
  end

Needed to become this:

  def language_redirect
    p2 = params.merge({:subdomain => session[:language]})
    redirect_to p2 unless RAILS_ENV == 'staging'
  end

Such a small change - such a big difference! Marketing types appeased!