Question

我在rails项目上有这个ruby，我想做db：migrate。但我唯一获得的rake选项是“Reload rake tasks”，所以当我点击它时，它会给我这个错误。

[rake --tasks] rake aborted!
uninitialized constant Rake::DSL
/usr/lib/ruby/1.8/rake.rb:2503:in `const_missing'
/var/lib/gems/1.8/gems/rake-0.9.2/lib/rake/tasklib.rb:8
/var/lib/gems/1.8/gems/rdoc-3.9.1/lib/rdoc/task.rb:37:in `require'
/var/lib/gems/1.8/gems/rdoc-3.9.1/lib/rdoc/task.rb:37
/var/lib/gems/1.8/gems/railties-3.0.9/lib/rails/tasks/documentation.rake:2:in `require'
/var/lib/gems/1.8/gems/railties-3.0.9/lib/rails/tasks/documentation.rake:2
/var/lib/gems/1.8/gems/railties-3.0.9/lib/rails/tasks.rb:15:in `load'
/var/lib/gems/1.8/gems/railties-3.0.9/lib/rails/tasks.rb:15
/var/lib/gems/1.8/gems/railties-3.0.9/lib/rails/tasks.rb:6:in `each'
/var/lib/gems/1.8/gems/railties-3.0.9/lib/rails/tasks.rb:6
/var/lib/gems/1.8/gems/railties-3.0.9/lib/rails/application.rb:215:in `require'
/var/lib/gems/1.8/gems/railties-3.0.9/lib/rails/application.rb:215:in `initialize_tasks'
/var/lib/gems/1.8/gems/railties-3.0.9/lib/rails/application.rb:139:in `load_tasks'
/var/lib/gems/1.8/gems/railties-3.0.9/lib/rails/application.rb:77:in `send'
/var/lib/gems/1.8/gems/railties-3.0.9/lib/rails/application.rb:77:in `method_missing'
/home/laptop/RubymineProjects/auth/Rakefile:7
/usr/lib/ruby/1.8/rake.rb:2383:in `load'
/usr/lib/ruby/1.8/rake.rb:2383:in `raw_load_rakefile'
/usr/lib/ruby/1.8/rake.rb:2017:in `load_rakefile'
/usr/lib/ruby/1.8/rake.rb:2068:in `standard_exception_handling'
/usr/lib/ruby/1.8/rake.rb:2016:in `load_rakefile'
/usr/lib/ruby/1.8/rake.rb:2000:in `run'
/usr/lib/ruby/1.8/rake.rb:2068:in `standard_exception_handling'
/usr/lib/ruby/1.8/rake.rb:1998:in `run'
/usr/bin/rake:28

谢谢，迈克尔。

Answer 1

这是一个常见问题。只需按照以下步骤操作：

gem install rake -v=0.9.2（如果你有0.9.1宝石）

gem uninstall rake -v=0.9.1（如果你有0.9.1宝石）

查看您的日志，我看到您有rake-0.9.2所以我认为您可以跳过上述两个步骤。

bundle update

然后，运行db:migrate将会出现如下错误：WARNING: Global access to Rake DSL methods is deprecated

要解决此问题，您只需将这两行添加到Rakefile

的顶部即可

require 'rake/dsl_definition'

include Rake::DSL

之后应该完美无缺！

Answer 2

你应该在你的Gemfile中专门添加Rake版本＆gt; = 0.9.1！某些Rails 3版本存在一个错误，当您使用较旧的Rake版本时，您会看到类似的奇怪错误。

在你的Gemfile中：

gem 'rake' , '>= 0.9.2'

我还建议您专门为您的应用程序创建一个新的gemset，例如

rvm gemset create yourproject
rvm gemset use yourproject

或：

rvm gemset use yourproject --default

对于新的gemset，你可能需要手动添加“gem install rake”，然后运行“bundle install”

除了使用Gemfile之外，使用单独的gemset是保持项目中的gem版本稳定并与其他项目分离的最佳方法。

耙宝石问题

2 个答案: