every time I run bundle --without=production bundler adds platform information PLATFORMS
x86-mingw32 to Gemfile.lock and I have to remove that info manually as I am deploying to Heroku. If I do not remove it, Gemfile.lock is not added to repository and causes errors.
how can I prevent bundler from adding platform info to Gemfile.lock
I had a very similar question - Can I stop Bundler from adding RUBY VERSION to Gemfile.lock - and it turns out the answer is that it can't be done. Bundler adds this information within the to_lock method and there's no conditional to skip that section.
It seems like it would be possible to refactor to_lock to control which sections of the lockfile are actually written, but so far this hasn't been enough of a pain point for me to make that effort yet.
来源：https://stackoverflow.com/questions/10356103/how-to-prevent-bundler-from-adding-platform-info-to-gemfile-lock