无法加载mysql2 gem

Question

我见过一些 不同 答案，但这些都帮不了我.

这就是诀窍:我必须修复这个，而不需要接触Gemfile。我目前正在创建我的工作环境，以便它与生产服务器相匹配，因此，我根本无法修改rails的代码。

我的操作系统: OSX 10.11

Ruby: Ruby2.0.0p643

Rails: 4.0.0

gem是作为gem 'mysql2'的Gemfile。在执行bundle install时没有错误，但是当我尝试rake db:migrate --trace时，这是输出：

拉克流产了！加载gem‘mysql2 2’时出错。/Users/redar/.rvm/gems/ruby-2.0.0-p643/gems/bundler-1.11.2/lib/bundler/runtime.rb:80:in rescue in block (2 levels) in require' /Users/redar/.rvm/gems/ruby-2.0.0-p643/gems/bundler-1.11.2/lib/bundler/runtime.rb:76:in块(2级)在require中的/Users/redar/.rvm/gems/ruby-2.0.0-p643/gems/bundler-1.11.2/lib/bundler/runtime.rb:72:in each' /Users/redar/.rvm/gems/ruby-2.0.0-p643/gems/bundler-1.11.2/lib/bundler/runtime.rb:72:in块中/User/redar/..rvm/gems/ruby2.0.0-p 643/gems/bundler-1.11.2/lib/bundler/runtime.rb:61:in each' /Users/redar/.rvm/gems/ruby-2.0.0-p643/gems/bundler-1.11.2/lib/bundler/runtime.rb:61:in需要‘/Users/redar/.rvm/gems/ruby-2.0.0-p643/gems/bundler-1.11.2/lib/bundler.rb:99:in require' /Users/redar/redar/config/application.rb:7:in’/each' /Users/redar/.rvm/gems/ruby-2.0.0-p643/gems/bundler-1.11.2/lib/bundler/runtime.rb:61:in/redar/redar/Rakefile:4:in require' /Users/redar/redar/Rakefile:4:in‘/Users/redar/.rvm/gems/ruby-2.0.0-p643/gems/rake-10’.1.0/lib/rake/rake_module.rb:25:in load' /Users/redar/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.1.0/lib/rake/rake\_module.rb:25:inload_rakefile‘load_rakefile’/Users/redar/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.1.0/lib/rake/application.rb:165:in standard\_exception\_handling' /Users/redar/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.1.0/lib/rake/application.rb:93:inload_中的raw\_load\_rakefile' /Users/redar/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.1.0/lib/rake/application.rb:94:in块rakefile‘/Users/redar/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.1.0/lib/rake/application.rb:77:in block in run' /Users/redar/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.1.0/lib/rake/application.rb:165:instandard_exception_handling’/Users/redar/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.1.0/lib/rake/application.rb:75:in run' /Users/redar/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.1.0/bin/rake:33:in/Users/redar/..rvm/gems/ruby2.0.0-p 643/bin/rake:23:in load' /Users/redar/.rvm/gems/ruby-2.0.0-p643/bin/rake:23:in‘load' /Users/redar/.rvm/gems/ruby-2.0.0-p643/bin/rake:23:in eval' /Users/redar/.rvm/gems/ruby-2.0.0-p643/bin/ruby\_executable\_hooks:15:in’

我不知道该怎么解释。Rakefile有什么问题吗？

另外，这是来自mkmf.log的输出

编辑：这是我的Rakefile的内容，位于myapp/文件夹

# Add your own tasks in files placed in lib/tasks ending in .rake,
# for example lib/tasks/capistrano.rake, and they will automatically be available to Rake.

require File.expand_path('../config/application', __FILE__)

MyApp::Application.load_tasks

Answer 1

试一试

bundle exec rake db:migrate

这将确保您正在使用Gemfile中列出的Gemfile中列出的Gemfile加载和可用的Gemfile执行"rake :migrate“。如果您在没有"bundle exec“的情况下运行它，则可能只使用可用的系统宝石执行。