Module ActionController::Flash
In: vendor/rails/actionpack/lib/action_controller/flash.rb

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.

Methods

flash   keep_flash  

Classes and Modules

Class ActionController::Flash::FlashHash

Protected Instance methods

Access the contents of the flash. Use flash["notice"] to read a notice you put there or flash["notice"] = "hello" to put a new one.

[Source]

     # File vendor/rails/actionpack/lib/action_controller/flash.rb, line 132
132:       def flash #:doc:
133:         @session['flash'] ||= FlashHash.new
134:       end

deprecated. use flash.keep instead

[Source]

     # File vendor/rails/actionpack/lib/action_controller/flash.rb, line 137
137:       def keep_flash #:doc:
138:         flash.keep
139:       end

[Validate]