另一个：未初始化的常量Rake :: DSL
这里是输出：
rake aborted! uninitialized constant Rake::DSL /Users/marclipovsky/Sites/sat-7/app/Rakefile:6 /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:2383:in `load' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:2383:in `raw_load_rakefile' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:2017:in `load_rakefile' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:2068:in `standard_exception_handling' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:2016:in `load_rakefile' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:2000:in `run' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:2068:in `standard_exception_handling' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:1998:in `run' /usr/bin/rake:31 这是我的rake文件：
require File.expand_path('../config/application', __FILE__) require 'rake' include Rake::DSL App::Application.load_tasks
甚至不确定要查看什么或从哪里开始。 任何帮助表示赞赏。 谢谢！
更新： Rake命令现在可以正常工作，但在运行命令之前我仍然可以得到它：
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/file_utils.rb:10: warning: already initialized constant RUBY /Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/file_utils.rb:84: warning: already initialized constant LN_SUPPORTED
有像Ruby on Rails和Rake问题的答案：未初始化的常量Rake :: DSL和Ruby Gem中未初始化的常量Rake :: DSL ……我会先尝试这个：
# [...] require 'rake/dsl_definition' require 'rake' # [...]
如果它没有完全修复它，你可以在你的Gemfile gem 'rake', '>=0.9.2' ，然后进行bundle update ，最后运行bundle exec rake db:migrate 。
对我有用的是从我的系统中删除旧版本的rake。 我跑了之后：
sudo gem uninstall rake -v 0.8.7
我不再看到错误：
/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/file_utils.rb:10: warning: already initialized constant RUBY /Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/file_utils.rb:84: warning: already initialized constant LN_SUPPORTED WARNING: Global access to Rake DSL methods is deprecated. Please include ... Rake::DSL into classes and modules which use the Rake DSL methods. WARNING: DSL method Rake::TestTask#ruby called at /Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/file_utils_ext.rb:36:in `ruby' WARNING: Global access to Rake DSL methods is deprecated. Please include ... Rake::DSL into classes and modules which use the Rake DSL methods. WARNING: DSL method Object#ruby called at /Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/file_utils_ext.rb:36:in `ruby'
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