Why a Rails flash message is shown twice
You set a flash message and it shows up as it should. However, it is displayed again the next time you follow a link. Here is why:
You have to differentiate between a render and a redirect_to because a flash message is only deleted after a redirect. If you want a message to be seen in the next request after a redirect, use flash[]. If you want a message to be seen in the current request, use flash.now[].
Workaround for the lazy
If you cannot be bothered to decide which flash hash to use, or if the flash is set by a piece of code outside your control, you can also change your layout displaying the flash so it deletes the flash message once displayed:
Copy- flash.slice(:notice, :message, :error, :success, :warning, :failure).each do |level, value| - if value.present? %div{:class => "flash #{h level}"} = h value - flash[level] = nil # set to nil in case the flash was set without a following redirect
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