Is there standard Rails mechanism to concat all javascript files into public/javascripts/cache/all.js?

If the file public/j开发者_C百科avascripts/cache/all.js is removed, and then a webpage is fetched from the rails server, then that all.js file magically reappears in the file system, with a timestamp that is half an hour ago. Is there actually Rails mechanism that regenerates this file or what might be regenerating this file?

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Most probably you're using javascript_include_tag :all, :cache => true somewhere in your layout. This will bundle all of your javascripts into all.js. You can also use :recursive => true to include subdirectories.

See http://api.rubyonrails.org/classes/ActionView/Helpers/AssetTagHelper.html#method-i-javascript_include_tag