I installed twitter bootstrap by copying the files to the directory of my resources according to the instructions here: http://www.erikminkel.com/2013/09/01/twitter-bootstrap-3-in-a-rails-4-application/
After following the instructions accurately presented and executing "rake assets: precompile RAILS_ENV = development", I can use bootstrap 3 on my development rails server.
However, when I try to execute "heroku run rake assets: precompile RAILS_ENV = production", I get this error:
Sass::SyntaxError: Invalid CSS after "...ss","sources":[": expected "|",
was ""less/theme.les..." (in /app/app/assets/stylesheets/application.css) (sass):444
I'm not sure what that means. When I open "application.css" in the "assets / stylesheets" folder, I can’t even find line 444. I have some forest files left after running the "rails g scaffold ..." commands - this may be the cause of this problem ? And, obviously, the deployed heroku application looks like a non-boot application when I look at it from the heroku page and give a "resource not found" error.
In public / assets / application-mydigest.ccs, I found the following line of code that causes an error:
{"version":3,"file":"bootstrap-theme.css","sources":["less/theme.less","less/mixins/vendor-prefixes.less","bootstrap-theme.css","less/mixins/gradients.less","less/mixins/reset-filter.less"],"names":[],"mappings":"AAeA;;;;;;EAME,0CAAA;EC+CA,6FAAA;EACQ,qFAAA;EC5DT;AFiBC;;;;;;;;;;;;EC0CA,0DAAA;EACQ,kDAAA;EC7CT;AFqCC;;EAEE,wBAAA;EEnCH;AFwCD;EG/CI,0EAAA;EACA,qEAAA
However, it seems strange that this will happen only in production. Also, the CSS syntax looks fine.