迁移错误：Gem：Module的未定义方法`cache’
通过rails app进行迁移时出现此错误
Gem：Module的未定义方法`cache’
我正在使用
Rails 3.2.9
Ruby 1.8.7
Ubuntu 12.04
rake db:migrate --trace /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/extlib-0.9.15/lib/extlib/object.rb:138: warning: method redefined; discarding old try_dup /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/extlib-0.9.15/lib/extlib/symbol.rb:3: warning: method redefined; discarding old try_dup /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/extlib-0.9.15/lib/extlib/time.rb:41: warning: method redefined; discarding old to_datetime /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/extlib-0.9.15/lib/extlib/boolean.rb:2: warning: method redefined; discarding old try_dup /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/extlib-0.9.15/lib/extlib/boolean.rb:8: warning: method redefined; discarding old try_dup /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/extlib-0.9.15/lib/extlib/module.rb:14: warning: method redefined; discarding old try_dup /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/extlib-0.9.15/lib/extlib/nil.rb:2: warning: method redefined; discarding old try_dup /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/extlib-0.9.15/lib/extlib/numeric.rb:2: warning: method redefined; discarding old try_dup /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core.rb:477: warning: method redefined; discarding old orm /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core.rb:494: warning: method redefined; discarding old test_framework /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core.rb:510: warning: method redefined; discarding old template_engine /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core/core_ext/kernel.rb:15: warning: (...) interpreted as grouped expression /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core/controller/abstract_controller.rb:620: warning: `*' interpreted as argument prefix /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core/controller/abstract_controller.rb:195: warning: redefine _template_root= /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core/gem_ext/erubis.rb:9: warning: method redefined; discarding old convert_input /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core/config.rb:158: warning: instance variable @configuration not initialized /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core.rb:310: warning: instance variable @root not initialized /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core.rb:310: warning: instance variable @root not initialized Merb root at: /home/rajendran/projects/myapp /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core.rb:310: warning: instance variable @root not initialized /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core.rb:310: warning: instance variable @root not initialized /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core.rb:310: warning: instance variable @root not initialized /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core.rb:310: warning: instance variable @root not initialized /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core.rb:310: warning: instance variable @root not initialized /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core.rb:310: warning: instance variable @root not initialized /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core.rb:310: warning: instance variable @root not initialized /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core.rb:310: warning: instance variable @root not initialized /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core.rb:310: warning: instance variable @root not initialized /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core.rb:310: warning: instance variable @root not initialized /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core.rb:310: warning: instance variable @root not initialized /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core.rb:310: warning: instance variable @root not initialized /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core.rb:310: warning: instance variable @root not initialized /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core.rb:310: warning: instance variable @root not initialized /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core.rb:310: warning: instance variable @root not initialized /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-helpers-1.1.3/lib/merb-helpers/core_ext.rb:43: warning: method redefined; discarding old to_time /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-helpers-1.1.3/lib/merb-helpers/form/helpers.rb:346: warning: method redefined; discarding old text_field /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-helpers-1.1.3/lib/merb-helpers/form/helpers.rb:346: warning: method redefined; discarding old password_field /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-helpers-1.1.3/lib/merb-helpers/form/helpers.rb:346: warning: method redefined; discarding old hidden_field /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-helpers-1.1.3/lib/merb-helpers/form/helpers.rb:346: warning: method redefined; discarding old file_field /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-helpers-1.1.3/lib/merb-helpers/form/helpers.rb:346: warning: method redefined; discarding old text_area /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-helpers-1.1.3/lib/merb-helpers/form/helpers.rb:346: warning: method redefined; discarding old select /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-helpers-1.1.3/lib/merb-helpers/form/helpers.rb:346: warning: method redefined; discarding old check_box /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-helpers-1.1.3/lib/merb-helpers/form/helpers.rb:346: warning: method redefined; discarding old radio_button /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-helpers-1.1.3/lib/merb-helpers/form/helpers.rb:346: warning: method redefined; discarding old radio_group /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-helpers-1.1.3/lib/merb-helpers/tag_helpers.rb:28: warning: method redefined; discarding old tag /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-helpers-1.1.3/lib/merb-helpers/tag_helpers.rb:38: warning: method redefined; discarding old open_tag /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-helpers-1.1.3/lib/merb-helpers/tag_helpers.rb:43: warning: method redefined; discarding old close_tag /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-helpers-1.1.3/lib/merb-helpers/tag_helpers.rb:51: warning: method redefined; discarding old self_closing_tag /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-mailer-1.1.3/lib/merb-mailer/mailer.rb:104: warning: `*' interpreted as argument prefix /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/templater-1.0.0/lib/templater/actions/action.rb:7: warning: method redefined; discarding old source= /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/templater-1.0.0/lib/templater/actions/action.rb:13: warning: method redefined; discarding old destination= /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/templater-1.0.0/lib/templater/generator.rb:596: warning: method redefined; discarding old destination_root /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/templater-1.0.0/lib/templater/core_ext/kernel.rb:3: warning: method redefined; discarding old instance_exec /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-gen-1.1.3/lib/merb-gen/templater.rb:4: warning: method redefined; discarding old identical? /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-gen-1.1.3/lib/merb-gen/templater.rb:25: warning: method redefined; discarding old invoke! /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-gen-1.1.3/lib/merb-gen/templater.rb:34: warning: method redefined; discarding old revoke! rake aborted! undefined method `cache' for Gem:Module /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/templater-1.0.0/lib/templater/discovery.rb:62:in `find_latest_gem_paths' /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/templater-1.0.0/lib/templater/discovery.rb:73:in `generator_files' /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/templater-1.0.0/lib/templater/discovery.rb:48:in `discover!' /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-gen-1.1.3/lib/merb-gen.rb:32 /home/rajendran/.rvm/gems/ruby-1.8.7-p374@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `require' /home/rajendran/.rvm/gems/ruby-1.8.7-p374@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `require' /home/rajendran/.rvm/gems/ruby-1.8.7-p374@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `each' /home/rajendran/.rvm/gems/ruby-1.8.7-p374@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `require' /home/rajendran/.rvm/gems/ruby-1.8.7-p374@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `each' /home/rajendran/.rvm/gems/ruby-1.8.7-p374@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `require' /home/rajendran/.rvm/gems/ruby-1.8.7-p374@global/gems/bundler-1.3.5/lib/bundler.rb:132:in `require' /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core/bootloader.rb:400:in `load_dependencies' /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core/bootloader.rb:375:in `run' /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/merb-core-1.1.3/lib/merb-core.rb:615:in `load_dependencies' /home/rajendran/projects/myapp/Rakefile:23 /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/rake-0.8.7/lib/rake.rb:2383:in `load' /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/rake-0.8.7/lib/rake.rb:2383:in `raw_load_rakefile' /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/rake-0.8.7/lib/rake.rb:2017:in `load_rakefile' /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling' /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/rake-0.8.7/lib/rake.rb:2016:in `load_rakefile' /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/rake-0.8.7/lib/rake.rb:2000:in `run' /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling' /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/rake-0.8.7/lib/rake.rb:1998:in `run' /home/rajendran/.rvm/gems/ruby-1.8.7-p374/gems/rake-0.8.7/bin/rake:31 /home/rajendran/.rvm/gems/ruby-1.8.7-p374/bin/rake:23:in `load' /home/rajendran/.rvm/gems/ruby-1.8.7-p374/bin/rake:23 /home/rajendran/.rvm/gems/ruby-1.8.7-p374/bin/ruby_executable_hooks:15 没有痕迹
rake db:migrate (in /home/rajendran/projects/myapp) Merb root at: /home/rajendran/projects/myapp rake aborted! undefined method `cache' for Gem:Module /home/rajendran/projects/myapp/Rakefile:23
帮我解决这个问题..
解：
- 我需要ruby 1.8.7（我无法升级，其项目依赖）
- gem集问题，我把gem -v 2.0改为1.8.25就是这样
感谢您的支持
更新：
更新/降级gemset
gem update --system 1.8.25
rvm rubygems 1.8.7 --force
为我工作。
我在Ruby 1.8.7和rails 2.0.2上遇到了类似的问题，所以我接受了你的建议并降级了rubygems。 这是告诉Ruby Version Manager执行此操作的命令：
rvm install --force rubygems 1.3.7
我想它不喜欢降级，所以你需要使用--force选项。
您可能正在使用非常旧的RubyGems版本。 我鼓励你升级RubyGems 。
您还应该停止使用Ruby 1.8.7。 它已不再维护。 升级到Ruby 1.9.3或更高版本。