Question

I’m working on a Sinatra project that’s using Sprockets. When I add a new stylesheet in the assets folder, I get this error:

Error compiling CSS asset

Sprockets::NotImplementedError: Custom asset_path helper is not
implemented

Extend your environment context with a custom method.

environment.context_class.class_eval do
  def asset_path(path, options = {})
  end
end

What am I doing wrong?

Answer 1

I followed the error message’s suggestion: I defined the asset_path method in config.ru:

environment.context_class.class_eval do
  def asset_path(path, options = {})
    "/assets/#{path}"
  end
end

I’m still not sure why this is needed, but it made the error go away.