$ rake db:migrate
rake aborted!
You have already activated rake 10.1.0, but your Gemfile requires rake 10.0.4. Using bundle exec may solve this.
哪里限制了 rake 的版本号，Gemfile 里没有
$ rake db:migrate
rake aborted!
You have already activated rake 10.1.0, but your Gemfile requires rake 10.0.4. Using bundle exec may solve this.
哪里限制了 rake 的版本号，Gemfile 里没有