问题
Reading answers to this question, we learn that changes in git are stored in .git that resides in the project's root directory. But in a normal Rails app I cannot see .git anywhere.
回答1:
On Windows, we have a folder called /.git -> this is built when we use the git add . & git commit commands. Here's a picture of it for you:
回答2:
.git directory is created by git, not rails.
If you don't use git to manage your rails project, there will no .git of course.
回答3:
If you use rails new app --git rails will not create a .git directory.
Usually the .git directory is a hidden folder. Under linux and mac you can show all folders and files with the ls -la command.
来源：https://stackoverflow.com/questions/19538707/where-does-git-store-changes-in-rails