Rails Flash Message Remains for Two Page Loads

Rails flash message remains for two page loads

There are two ways to solve this problem:

  • flash.now
  • flash.discard

One is to use

flash.now[:notice]

when your flash must be discarded at the end of the current request and is not intended to be used after a redirect.

The second one is to call

flash.discard(:notice)

at the end of the request.

The standard flash message is intended to be kept for the "next" request. E.g. you generate a flash while handling a create or edit request, then redirect the user to the show screen. When the browser makes the next request to the show screen, the flash is displayed.

If you actually generate a flash on the show screen itself, use flash.now.

Check the Ruby on Rails API documentation to see how the Flash hash works

flash message in Rails stays until next webpage

Use now method:

flash.now[:alert] = 'Please fix mistakes outlined in red'

If link_to is clicked flash message on new page?

view

<%= link_to performance_path(alert: true), class: "btn", style: "padding-top: 10px; padding-bottom: 10px; margin-top: 15px; color: white;" do %>
<span class='glyphicon glyphicon-tower'></span> Duel
<% end %>

controller

def performance
@user = current_user
flash[:alert] = "YOU'RE NOT AUTHORIZED TO INITIATE A DUEL UNTIL YOU BECOME A NINJA, BUT YOU CAN BE INVITED TO A DUEL" if params[:alert].present?
end

performance view

<% if flash[:alert] %>
<%= flash[:alert] %>
<% end %>

rails: prevent flash message from showing twice

flash.now[:notice] = 'message'

Rails 4: Flash message persists for the next page view

Use flash.now instead of flash.

The flash variable is intended to be used before a redirect, and it persists on the resulting page for one request. This means that if we do not redirect, and instead simply render a page, the flash message will persist for two requests: it appears on the rendered page but is still waiting for a redirect (i.e., a second request), and thus the message will appear again if you click a link.

To avoid this weird behavior, when rendering rather than redirecting we use flash.now instead of flash.

The flash.now object is used for displaying flash messages on a rendered page. As per my assumption, if you ever find a random flash message where you do not expect it, you can resolve it by replacing flash with flash.now.

How to show the flash message in Rails only once?

This is probably a generic browser caching problem.
You can force your browser to reload a page while hitting the back button by setting some no-cache headers.

You could try this approach: (found after a quick google search, you might want to dig deeper)

http://blog.serendeputy.com/posts/how-to-prevent-browsers-from-caching-a-page-in-rails/



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