adopt-a-hydrant/app/controllers/application_controller.rb

class ApplicationController < ActionController::Base
  protect_from_forgery
  before_filter :set_flash_from_params
  before_filter :set_locale

protected

  def set_flash_from_params
    if params[:flash]
      params[:flash].each do |key, message|
        flash.now[key.to_sym] = message
      end
    end
  end

  def set_locale
    I18n.locale = env['rack.locale'] || I18n.default_locale
  end
end