If asset_host is set as a 2 arguement Proc, asset tag helpers will  
fall over at compute_asset_host when called from mailer views because  
Mailers do not have access to a request object.

I've created a small patch that modifies compute_asset_host to return  
nil in place of a request object if it's not present:

http://rails.lighthouseapp.com/projects/8994-ruby-on-rails/tickets/1394-compute_asset_host-bombs-when-asset_host-proc-and-called-from-a-mailer

This way, if your using asset tag helpers in your mailer views, you  
can write your Proc to deal with nil requests and all is well!


Tekin Suleyman

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