Ruby on Rails 错误“Rails 4.0.0, Gemfile requires rake 10.1.0 for Rake” 解决方案

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问题：

在 rake db:migrate 出现问题：

Joses-MacBook-Air:crumblr JRV$ rake db:migraterake aborted!You have already activated rake 10.1.1, but your Gemfile requires rake 10.1.0. Using      bundle exec may solve this./usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.5/lib/bundler/runtime.rb:33:in `block   in setup'/usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.5/lib/bundler/runtime.rb:19:in `setup'/usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.5/lib/bundler.rb:120:in `setup'/usr/local/rvm/gems/ruby-1.9.3-p392/gems/bundler-1.3.5/lib/bundler/setup.rb:7:in `<top    (required)>'/Users/JRV/crumblr/config/boot.rb:4:in `<top (required)>'/Users/JRV/crumblr/config/application.rb:1:in `<top (required)>'/Users/JRV/crumblr/Rakefile:4:in `<top (required)>'(See full trace by running task with --trace)

解决方案：

如错误提示中建议的，使用：bundle exec rake db:migrate
或者不添加前缀，使用：bundle update rake

转载自：

http://stackoverflow.com/questions/21220371/rails-4-0-0-gemfile-requires-rake-10-1-0-for-rake

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