Rails 3 and asset_hosts in css?

I'm using rails 3 in production and development.

How do I use the asset_host path in css, for example with bac开发者_StackOverflow中文版kground-images?

I've tried:

.blerg{ background-image:url({asset_host}/images/blerg.gif); }

But it just comes out as that in the rendered document, is there anything special you have to do when including the css to get this to work?

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If you are using Rails 3.1 Asset Pipline you can use the following in sass/scss

.blerg{ background-image: image-url(blerg.gif); }

The added advantage of this approach is that in production the css image will also contain the MD5 fingerprinting so you can setup a far future expires header on your background images and still have them expire if you make changes to them.

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If you are serving css files from asset host all relative linked images in your css file are served from the same host.

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If you just do /assets/blerg.gif it should work fine.