How can I execute a image_tag method in a Rails console
Run the console $ rails c
Load helpers
include ActionView::Helper
OK... I found the solution. The error is showing only in Rails 3 but I fixed it by setting the
config.action_controller.asset_host = "http://..."
config.action_mailer.asset_host = "http://..."
in my environemnt file (e.g. development.rb). Unbelievable!
This functionality is now part of a plugin https://github.com/xpepermint/js_erb.