無法運行rake db：migrate

Question

我剛接觸rails， 我已經完成了本教程http://pragmaticstudio.com/blog/2010/9/23/install-rails-ruby-mac在我的ubuntu 11.04上的所有步驟，但我無法運行rake db：migrate。

它提供的輸出：

/home/breedish/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/version.rb:4: warning: already initialized constant MAJOR 
/home/breedish/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/version.rb:5: warning: already initialized constant MINOR 
/home/breedish/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/version.rb:6: warning: already initialized constant BUILD 
/home/breedish/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/version.rb:3: warning: already initialized constant NUMBERS 
/home/breedish/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/version.rb:9: warning: already initialized constant VERSION 
/home/breedish/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake.rb:26: warning: already initialized constant RAKEVERSION 
/home/breedish/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/early_time.rb:17: warning: already initialized constant EARLY 
/home/breedish/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/alt_system.rb:32: warning: already initialized constant WINDOWS 
/home/breedish/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/application.rb:28: warning: already initialized constant DEFAULT_RAKEFILES 
WARNING: Possible conflict with Rake extension: String#ext already exists 
WARNING: Possible conflict with Rake extension: String#pathmap already exists 
/home/breedish/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/task_arguments.rb:73: warning: already initialized constant EMPTY_TASK_ARGS 
/home/breedish/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/invocation_chain.rb:49: warning: already initialized constant EMPTY 
/home/breedish/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/file_utils.rb:10: warning: already initialized constant RUBY 
/home/breedish/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/file_utils.rb:84: warning: already initialized constant LN_SUPPORTED 
/home/breedish/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/dsl_definition.rb:143: warning: already initialized constant Commands 
/home/breedish/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/file_list.rb:44: warning: already initialized constant ARRAY_METHODS 
/home/breedish/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/file_list.rb:47: warning: already initialized constant MUST_DEFINE 
/home/breedish/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/file_list.rb:51: warning: already initialized constant MUST_NOT_DEFINE 
/home/breedish/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/file_list.rb:55: warning: already initialized constant SPECIAL_RETURN 
/home/breedish/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/file_list.rb:61: warning: already initialized constant DELEGATING_METHODS 
/home/breedish/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/file_list.rb:364: warning: already initialized constant DEFAULT_IGNORE_PATTERNS 
/home/breedish/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/file_list.rb:370: warning: already initialized constant DEFAULT_IGNORE_PROCS 
/home/breedish/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake.rb:64: warning: already initialized constant FileList 
/home/breedish/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake.rb:65: warning: already initialized constant RakeFileUtils 
rake aborted! 
stack level too deep 

如何解決耙運行我的初始遷移

我有1.9.2紅寶石，3.0.10軌

THX任何幫助

Answer 1

我最近也遇到了這個錯誤。將bundle exec放在命令前解決它。

bundle exec rake db:migrate 

Here's a previous StackOverflow question with the same error.

And, there's more information about bundle exec here.

Answer 2

嘗試安裝耙的舊版本。

gem install rake -v=0.8.7

使用耙子時，您可能會收到一條警告消息。

警告：不贊成使用對Rake DSL方法的全局訪問。請將 ... Rake :: DSL納入使用Rake DSL方法的類和模塊中。

在應用程序load_tasks被調用之前，您可以將「包括Rake :: DSL」添加到Rakefile。

我找到了一個帖子來解決這個問題。 Global access to Rake DSL methods is deprecated