rails 安装指定的版本
$ mkdir myapp
$ cd myapp
$ echo "source 'https://rubygems.org'" > Gemfile
$ echo "gem 'rails', '5.0.0.1'" >> Gemfile
$ bundle install
bundle exec rails new
bundle exec rails new . --webpack=vue --database=postgresql --force
$ mkdir myapp
$ cd myapp
$ echo "source 'https://rubygems.org'" > Gemfile
$ echo "gem 'rails', '5.0.0.1'" >> Gemfile
$ bundle install
bundle exec rails new
bundle exec rails new . --webpack=vue --database=postgresql --force