# Shortcut for :unprocessable_entity, head(:failed) instead of head(:unprocessable_entity)
ActionController::StatusCodes::SYMBOL_TO_STATUS_CODE[:failed] = 422

# 
# url_for, used to generate url_for for string path with options and with default_url_options
# 
ActionController::Base.class_eval do
  protected  
    # 
    # Bunch of small actions
    # 
    def render_action action_or_template    
      args = action_or_template.to_s.split('/')      
      args.size.should! :be_in, 1..2
      if args.size == 1
        action = args.first
        @the_action = action.to_sym
        render :action => 'actions'
      else
        path, action = args
        @the_action = action.to_sym
        render :template => "#{path}/actions"
      end       
    end
    
    def the_action; @the_action end
    helper_method :the_action    
  
  
    # 
    # Url from String Path
    # 
    def url_for_path path, options = {}
      unless options.delete :no_prefix
        url = ActionController::Base.relative_url_root + path
      else
        url = path
      end
      options = options.merge default_url_options
      url << "?#{options.to_query}" unless options.empty?
      url._url_format = options[:format] if options[:format] # for links with ajax support
      url
    end
    helper_method :url_for_path
  
   
    # 
    # User Error
    # 
    def catch_user_error
      begin
        yield
      rescue UserError => e
        flash[:error] = e.message
        do_not_persist_params do
          if request.xhr?
            render :inline => "", :layout => 'application'
          else
            redirect_to default_path
          end          
        end
      end
    end
    around_filter :catch_user_error
  
  class << self
    def prepare_model aclass, opt = {}
      id = opt.delete(:id) || :id
      variable = opt.delete(:variable) || aclass.name.underscore
      finder = opt.delete(:finder) || :find!
      
      method = "prepare_#{variable}"
      define_method method do
        model = aclass.send finder, params[id]
        instance_variable_set "@#{variable}", model
      end
      before_filter method, opt
    end
  end
end