This is the reference implementation of the sample application for the 4th edition of Ruby on Rails Tutorial: Learn Web Development with Rails by Michael Hartl.
1、定制登录注册模块
2、微博
3、Minitest 测试（第三版用的是 Rspec）
For general help on the Rails Tutorial, see the Rails Tutorial Help page.
All source code in the Ruby on Rails Tutorial is available jointly under the MIT License and the Beerware License. See LICENSE.md for details.
To get started with the app, clone the repo and then install the needed gems:
$ cd /path/to/repos
$ git clone https://bitbucket.org/railstutorial/sample_app_4th_ed.git sample_app_reference
$ cd sample_app_reference
$ bundle install --without production
Next, migrate the database:
$ rails db:migrate
Finally, run the test suite to verify that everything is working correctly:
$ rails test
If the test suite passes, you'll be ready to run the app in a local server:
$ rails server
To check out the code for a particular chapter, first find the branch name using
$ git branch -a
A branch called remotes/orgin/foo-bar can be checked out using git checkout foo-bar.
Next, copy the contents of the Gemfile using a text editor and then use
$ git checkout chapter-branch-name
to check out the chapter branch. Finally, copy the contents into the Gemfile and run
$ bundle update
At this point, the branch should be working. (You have to copy the Gemfile contents because it's incredibly hard to keep all branches up-to-date, so only the main one is guaranteed to be current.)
For more information, see the Ruby on Rails Tutorial book.