In rails controllers, how to prevent double submit (when user double-clic submit button or hit enter twice)?

Well, everything's in the title but I'll explain a little more :-)

My rails app contain many forms (Ajaxified or not).

To prevent users to submit twice or more some forms, I use Javascript.

There's my scenario for a Ajaxified form :

the user submit the form (clic or enter)
the javascript disable the submit button
the rails controller do things (like a Soap request or an insert in a DB)
the rails controller update the page and enable the submit button if necessary (in case of errors)

Now I want to add server side code to keeps things really clean if the user bypass the javascript.

Any suggestions?

Solution

Try using Redis locking and surround your block with something like

Redis.current.lock("#{current_user.id}.action_name") do
   # Some code
end