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Add note about image_tag('') issue in Asset Pipeline guide (see rails…

… issue #3080)
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1 parent b214ddd commit 85f71c53296e2f360f723236dee7a3193db35a13 @mipearson mipearson committed May 2, 2012
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  1. +2 −0 guides/source/asset_pipeline.textile
@@ -204,6 +204,8 @@ Images can also be organized into subdirectories if required, and they can be ac
<%= image_tag "icons/rails.png" %>
</erb>
+WARNING: If you're precompiling your assets (see "In Production":#in-production below), linking to an asset that does not exist will raise an exception in the calling page. This includes linking to a blank string. As such, be careful using <tt>image_tag</tt> and the other helpers with user-supplied data.
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h5. CSS and ERB
The asset pipeline automatically evaluates ERB. This means that if you add an +erb+ extension to a CSS asset (for example, +application.css.erb+), then helpers like +asset_path+ are available in your CSS rules:

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