问题安装Rails_Admin

Question

我最初加入gem 'rails_admin', :git => 'git://github.com/sferik/rails_admin.git'我的Gemfile，但我得到这个错误：

Bundler could not find compatible versions for gem "rails": 
    In snapshot (Gemfile.lock): 
    rails (3.0.4) 

    In Gemfile: 
    rails_admin depends on 
     rails (~> 3.0.7) 

所以我更新到3.0.7轨道并安装rails_admin (0.0.1) from git://github.com/sferik/rails_admin.git (at master)

我在控制台中运行rake rails_admin:install和我这个错误：

rake aborted! 
undefined method `task' 

以下是完整的跟踪：

/Library/Ruby/Gems/1.8/gems/railties-3.0.7/lib/rails/application.rb:215:in `initialize_tasks' 
/Library/Ruby/Gems/1.8/gems/railties-3.0.7/lib/rails/application.rb:139:in `load_tasks' 
/Library/Ruby/Gems/1.8/gems/railties-3.0.7/lib/rails/application.rb:77:in `send' 
/Library/Ruby/Gems/1.8/gems/railties-3.0.7/lib/rails/application.rb:77:in `method_missing' 
/rubyprograms/dreamstill/Rakefile:7 
/Library/Ruby/Gems/1.8/gems/rake-0.9.0/lib/rake/rake_module.rb:25:in `load' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.0/lib/rake/rake_module.rb:25:in `load_rakefile' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.0/lib/rake/application.rb:495:in `raw_load_rakefile' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.0/lib/rake/application.rb:78:in `load_rakefile' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.0/lib/rake/application.rb:129:in `standard_exception_handling' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.0/lib/rake/application.rb:77:in `load_rakefile' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.0/lib/rake/application.rb:61:in `run' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.0/lib/rake/application.rb:129:in `standard_exception_handling' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.0/lib/rake/application.rb:59:in `run' 
/Library/Ruby/Gems/1.8/gems/rake-0.9.0/bin/rake:31 
/usr/bin/rake:19:in `load' 
/usr/bin/rake:19 

发生了什么事以及如何安装rails_admin？

Answer 1

这是使用rake 0.9的已知问题。为了解决这个问题，只要做到以下几点：

• 卸载耙0.9：gem uninstall rake -v 0.9
• 添加到您的Gemfile：gem 'rake', '~> 0.8.7
• 更新包：bundle update

，你应该是好走。