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] = "Successfully 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] = "Successfully 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.

See docs on the FlashHash class for more details about the flash.

Defined Under Namespace

Classes: FlashHash, FlashNow

Class Method Summary collapse

Class Method Details

.append_features(base) ⇒ Object

:nodoc:


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# File 'lib/action_controller/flash.rb', line 27

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