Module: ActionController::Flash

Defined in:
lib/action_controller/flash.rb

Overview

The flash provides a way to pass temporary objects between actions. Anything you place in the flash will be exposed to the very next action and then cleared out. This is a great way of doing notices and alerts, such as a create action that sets flash["notice"] = "Succesfully created" before redirecting to a display action that can then expose the flash to its template. Actually, that exposure is automatically done. Example:

class WeblogController < ActionController::Base
  def create
    # save post
    flash["notice"] = "Succesfully created post"
    redirect_to :action => "display", :params => { "id" => post.id }
  end

  def display
    # doesn't need to assign the flash notice to the template, that's done automatically
  end
end

display.rhtml
  <% if @flash["notice"] %><div class="notice"><%= @flash["notice"] %></div><% end %>

This example just places a string in the flash, but you can put any object in there. And of course, you can put as many as you like at a time too. Just remember: They’ll be gone by the time the next action has been performed.

Class Method Summary collapse

Class Method Details

.append_features(base) ⇒ Object

:nodoc:



25
26
27
28
29
 
# File 'lib/action_controller/flash.rb', line 25

def self.append_features(base) #:nodoc:
  super
  base.before_filter(:fire_flash)
  base.after_filter(:clear_flash)
end