From 85f71c53296e2f360f723236dee7a3193db35a13 Mon Sep 17 00:00:00 2001 From: Michael Pearson Date: Wed, 2 May 2012 17:42:33 +1000 Subject: [PATCH] Add note about image_tag('') issue in Asset Pipeline guide (see rails issue #3080) --- guides/source/asset_pipeline.textile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/guides/source/asset_pipeline.textile b/guides/source/asset_pipeline.textile index d79eb01ab2..010154f1d1 100644 --- a/guides/source/asset_pipeline.textile +++ b/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" %> +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 image_tag and the other helpers with user-supplied data. + 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: