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Fix the Rails 4 asset pipeline to generate non-digest along with digest assets

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Non-stupid non-digest assets in Rails 4

What is it?

In Rails 4, there is no way to by default compile both digest and non-digest assets. This is a pain in the arse for almost everyone developing a Rails 4 app. This gem solves the problem with the minimum possible effort.

How do I install it?

Just put it in your Gemfile

gem "sprockets-digest-assets-fix"

But shouldn't I always use the Rails asset helpers anyway?

Yes. But there are some obvious cases where you can't do this:

  • Third party libraries in vendor/assets that need to include e.g. css / images
  • In a static error page, e.g. a 404 page or a 500 page
  • Referencing the assets from outside your rails application

What about other solutions?

sprockets-redirect uses a rack middleware to 302 redirect to the digest asset. This is terrible for performance because it requires 2 HTTP requests, and it also hits your ruby stack. An asset request should be handled by your webserver (e.g. nginx) because that's what it's good at.

This rake task will solve this problem, but requires an extra rake task. It won't work by default with things like capistrano / heroku. And it requires you to manage the code in your app.

Why do I need digest assets at all?

Digests are used for cache busting. Remember that if you use the non-digest assets and serve them with far-future expires headers, you will cause problems with cached assets if the contents ever need to change. You must bear this in mind when using non-digest assets.

Why is this not the default / a config option in Rails 4?

Good question. I think it should be. Complain here

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Fix the Rails 4 asset pipeline to generate non-digest along with digest assets

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