Railscasts - Looping Through Flash

#18

Apr 13, 2007

Looping Through Flash

Displaying flash messages in the layout can be a pain at times. In this episode you will learn an easy way to display any kind of flash message by looping through the hash.

Tags: views

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<!-- layouts/application.rhtml -->
<% flash.each do |key, msg| %>
  <%= content_tag :div, msg, :id => key %>
<% end %>

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13 comments

1. Olek Poplavsky Jul 22, 2007 at 07:40

This is fine approach, but it will display errors mixed with warnings in no particular order, and that is not good in my opinion. I prefer messages sorted in order of decreasing severity: [:error, :warning, :notice, :message]

I have some code that does it, but I written it at the very beginning of studying ruby/rails, so I will not posit it here, it is not pretty ;)

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2. Ryan Bates Jul 22, 2007 at 08:15

How about this: http://pastie.caboo.se/81153

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3. meekish Jan 25, 2008 at 14:15

Here's a HAML version: http://pastie.textmate.org/143587

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4. austin_web_developer Dec 08, 2008 at 06:42

Does anyone have the problem where the flash message stays on the page one reload more than it is supposed to?

So if you reload the page, the flash message is still there, but it goes away after a second reload.

Its a problem because if you carry out an action and you get an error, then do it again and get a success message, the previous message is displayed on the page at the same time as the current one.

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5. Travis Roberts Dec 11, 2008 at 11:31

@austin_web_developer You can fix this by using flash.now[:notice] instead of flash[:notice]. I wrote a blog post explaining how the flash hash works: http://travisonrails.com/2008/08/17/Working-with-the-flash-hash"

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7. MBT shoes on sale Jan 14, 2010 at 10:25

nice blog! thanks

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8. Bob Smith Jan 28, 2010 at 21:39

Having trouble with flash.. with flash[:notice] or the method shown here, any use of flash causes a 'stack level too deep' error. Is there any way to clear the flash ? I assume this would clear the error.

Bob

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12. Panyusha Feb 22, 2010 at 11:21

I like it. Thanks.

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13. Emiliana Feb 26, 2010 at 13:18

A very good article, I will always come in.

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16. Rex Mar 17, 2010 at 09:42

I'm new to Rails. Love the RailsCasts. Sometimes, even using the Flash.now, I get a one-line blank highlighted line on the next page, reached by using a Nav bar link_to function. The idea is that sometimes the user sees the error message and just bails out to another place in the program using the navigation bar function. The html source of the problem page reads:

On Safari on a Mac, this generates a single colored line for each division, containing no text.

I've only been able to eliminate this quirk by adding an "if flash[:error]" check before div & flash lines - obviously not using the cycling method described here and typing many more characters. Any tips would be appreciated.

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Looping Through Flash

13 comments

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