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<title>Module: ActionController::Flash</title>
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<td><strong>Module</strong></td>
<td class="class-name-in-header">ActionController::Flash</td>
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<td><strong>In:</strong></td>
<td>
<a href="../../files/lib/action_controller/flash_rb.html">
lib/action_controller/flash.rb
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<p>
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 <tt>flash[:notice] = "Successfully
created"</tt> before redirecting to a display action that can then
expose the flash to its template. Actually, that exposure is automatically
done. Example:
</p>
<pre>
class PostsController < ActionController::Base
def create
# save post
flash[:notice] = "Successfully created post"
redirect_to posts_path(@post)
end
def show
# doesn't need to assign the flash notice to the template, that's done automatically
end
end
show.html.erb
<% if flash[:notice] %>
<div class="notice"><%= flash[:notice] %></div>
<% end %>
</pre>
<p>
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.
</p>
<p>
See docs on the <a href="Flash/FlashHash.html">FlashHash</a> class for more
details about the flash.
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<a href="#M000155">included</a>
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<h3 class="section-bar">Classes and Modules</h3>
Class <a href="Flash/FlashHash.html" class="link">ActionController::Flash::FlashHash</a><br />
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<h3 class="section-bar">Public Class methods</h3>
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<span class="method-name">included</span><span class="method-args">(base)</span>
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