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Rails - How to get the URL of a single image object in a controller?

I tried turning ActionView::Helpers::AssetTagHelperit on and then using the method image_path(), however this gives me sadness:

undefined local variable or method `config' for ActionView::Helpers::AssetTagHelper:Module

Perhaps something simple that I am missing. Any ideas?

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I found a solution in Barlow here: How can I use image_path inside Rails 3 Controller

view_context.image_path('/path/to/image')

seems to work for me, no need to include helpers in the controller

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