Rails rake 给出冲突消息（rails 3.1）答案

【问题标题】：Rails rake giving conflict messages (rails 3.1)Rails rake 给出冲突消息（rails 3.1）
【发布时间】：2011-10-08 14:00:47
【问题描述】：

缩写路径：

me@michael-laptop:~/Dropbox_not_syncd/webs/3/tdd/rubyists$ rake db:create
.../rake/version.rb:4: warning: already initialized constant MAJOR
.../rake/version.rb:5: warning: already initialized constant MINOR
.../rake/version.rb:6: warning: already initialized constant BUILD
.../rake/version.rb:3: warning: already initialized constant NUMBERS
.../rake/version.rb:9: warning: already initialized constant VERSION
.../rake.rb:26: warning: already initialized constant RAKEVERSION
.../rake/early_time.rb:17: warning: already initialized constant EARLY
.../rake/alt_system.rb:32: warning: already initialized constant WINDOWS
.../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
.../rake/task_arguments.rb:73: warning: already initialized constant EMPTY_TASK_ARGS
.../rake/invocation_chain.rb:49: warning: already initialized constant EMPTY
.../rake/file_utils.rb:10: warning: already initialized constant RUBY
.../rake/file_utils.rb:84: warning: already initialized constant LN_SUPPORTED
.../rake/dsl_definition.rb:143: warning: already initialized constant Commands
.../rake/file_list.rb:44: warning: already initialized constant ARRAY_METHODS
.../rake/file_list.rb:47: warning: already initialized constant MUST_DEFINE
.../rake/file_list.rb:51: warning: already initialized constant MUST_NOT_DEFINE
.../rake/file_list.rb:55: warning: already initialized constant SPECIAL_RETURN
.../rake/file_list.rb:61: warning: already initialized constant DELEGATING_METHODS
.../rake/file_list.rb:364: warning: already initialized constant DEFAULT_IGNORE_PATTERNS
.../rake/file_list.rb:370: warning: already initialized constant DEFAULT_IGNORE_PROCS
.../rake.rb:64: warning: already initialized constant FileList
.../rake.rb:65: warning: already initialized constant RakeFileUtils
rake aborted!
stack level too deep

(See full trace by running task with --trace)

完整路径：

@michael-laptop:~/Dropbox_not_syncd/webs/3/tdd/rubyists$ rake db:create
/home/me/.rvm/gems/ruby-1.9.2-p180@global/gems/rake-0.9.2/lib/rake/version.rb:4: warning: already initialized constant MAJOR
/home/me/.rvm/gems/ruby-1.9.2-p180@global/gems/rake-0.9.2/lib/rake/version.rb:5: warning: already initialized constant MINOR
/home/me/.rvm/gems/ruby-1.9.2-p180@global/gems/rake-0.9.2/lib/rake/version.rb:6: warning: already initialized constant BUILD
/home/me/.rvm/gems/ruby-1.9.2-p180@global/gems/rake-0.9.2/lib/rake/version.rb:3: warning: already initialized constant NUMBERS
/home/me/.rvm/gems/ruby-1.9.2-p180@global/gems/rake-0.9.2/lib/rake/version.rb:9: warning: already initialized constant VERSION
/home/me/.rvm/gems/ruby-1.9.2-p180@global/gems/rake-0.9.2/lib/rake.rb:26: warning: already initialized constant RAKEVERSION
/home/me/.rvm/gems/ruby-1.9.2-p180@global/gems/rake-0.9.2/lib/rake/early_time.rb:17: warning: already initialized constant EARLY
/home/me/.rvm/gems/ruby-1.9.2-p180@global/gems/rake-0.9.2/lib/rake/alt_system.rb:32: warning: already initialized constant WINDOWS
/home/me/.rvm/gems/ruby-1.9.2-p180@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/me/.rvm/gems/ruby-1.9.2-p180@global/gems/rake-0.9.2/lib/rake/task_arguments.rb:73: warning: already initialized constant EMPTY_TASK_ARGS
/home/me/.rvm/gems/ruby-1.9.2-p180@global/gems/rake-0.9.2/lib/rake/invocation_chain.rb:49: warning: already initialized constant EMPTY
/home/me/.rvm/gems/ruby-1.9.2-p180@global/gems/rake-0.9.2/lib/rake/file_utils.rb:10: warning: already initialized constant RUBY
/home/me/.rvm/gems/ruby-1.9.2-p180@global/gems/rake-0.9.2/lib/rake/file_utils.rb:84: warning: already initialized constant LN_SUPPORTED
/home/me/.rvm/gems/ruby-1.9.2-p180@global/gems/rake-0.9.2/lib/rake/dsl_definition.rb:143: warning: already initialized constant Commands
/home/me/.rvm/gems/ruby-1.9.2-p180@global/gems/rake-0.9.2/lib/rake/file_list.rb:44: warning: already initialized constant ARRAY_METHODS
/home/me/.rvm/gems/ruby-1.9.2-p180@global/gems/rake-0.9.2/lib/rake/file_list.rb:47: warning: already initialized constant MUST_DEFINE
/home/me/.rvm/gems/ruby-1.9.2-p180@global/gems/rake-0.9.2/lib/rake/file_list.rb:51: warning: already initialized constant MUST_NOT_DEFINE
/home/me/.rvm/gems/ruby-1.9.2-p180@global/gems/rake-0.9.2/lib/rake/file_list.rb:55: warning: already initialized constant SPECIAL_RETURN
/home/me/.rvm/gems/ruby-1.9.2-p180@global/gems/rake-0.9.2/lib/rake/file_list.rb:61: warning: already initialized constant DELEGATING_METHODS
/home/me/.rvm/gems/ruby-1.9.2-p180@global/gems/rake-0.9.2/lib/rake/file_list.rb:364: warning: already initialized constant DEFAULT_IGNORE_PATTERNS
/home/me/.rvm/gems/ruby-1.9.2-p180@global/gems/rake-0.9.2/lib/rake/file_list.rb:370: warning: already initialized constant DEFAULT_IGNORE_PROCS
/home/me/.rvm/gems/ruby-1.9.2-p180@global/gems/rake-0.9.2/lib/rake.rb:64: warning: already initialized constant FileList
/home/me/.rvm/gems/ruby-1.9.2-p180@global/gems/rake-0.9.2/lib/rake.rb:65: warning: already initialized constant RakeFileUtils
rake aborted!
stack level too deep

(See full trace by running task with --trace)

【问题讨论】：

你试过Rake error - stack level too deep中的技巧吗？还有使用bundle exec rake ... 而不是`rake ...的提示？ ?请参阅blog post of Yehuda Katz 了解更多信息。
是的，bundle exec 工作了。谢谢。（见下文）。

标签： ruby-on-rails rake rvm

【解决方案1】：

bundle exec rake db:migrate 应该可以解决这个错误。不久前我遇到了同样的事情，这为我解决了。

【讨论】：

我不喜欢必须使用 bundle exec，因为我总是能够在没有它的情况下完成工作。不过我会接受。会给你支票。
如果您不想使用bundle exec，您可以使用gem install rake -v (version)... 基本上安装与您的应用程序捆绑的相同rake，以便您使用您系统的rake，而不是您应用的版本。

【解决方案2】：

附带说明，RVM 不再将 rake 安装到全局 gemset 中，以便与特定 ruby 的每个 gemset 一起使用。这是密切相关的，因为我们这样做是为了让您可以通过 Gemfile 和/或 gemset 直接安装 rake PER-PROJECT。

我们强烈鼓励每个项目的 .rvmrc 文件，以便将每个项目的 gem 隔离到其特定的 gemset 分配。这可以防止 A) 被污染或 B) 污染其他 gemsets 的“默认”和/或“全局”。

对于每个已安装的 Ruby，“全局”gemset 中唯一应该包含的 gem 应该是 bundler。

rvm x.x.x@global exec rvm gemset empty && rvm x.x.x@global exec gem install bundler && rvm --create use x.x.x@mygemset && gem list -l

将非常有效地证明这一点。此外，通过这种方式，您可以有效地消除

bundle exec ...

完全没有。

【讨论】：