问题
I am using 'rails', '4.2.5' and wicked_pdf gem for generating and downloading PDF, but on Heroku, it's not including css using wicked_pdf_stylesheet_link_tag tag.
Heroku error log:
ActionView::Template::Error (undefined method 'find_asset' for nil:NilClass)
Did I miss any configuration here?
回答1:
To get it work for development and production environment don't use
Rails.application.assets.find_asset(logical_file_path).to_s
for sprockets-rails version > 3.0.0 but use this (requires gem compass-rails):
CompassRails.sprockets.find_asset(logical_file_path).to_s
If you don't use gem compass-rails you can get the asset with:
(Rails.application.assets || ::Sprockets::Railtie.build_environment(Rails.application)).find_asset(logical_file_path).to_s
回答2:
A simple Google search, revealed that this error was reported in the official wicked_pdf repo in December.
Setting assets.compile = true as recommended in the issue would fix it. This change should not be necessary with sprocket-rails != 3.0.0
来源：https://stackoverflow.com/questions/35251759/undefined-method-find-asset-for-nilnilclass