如何解决 RoR 中的 rake db:migrate 错误？

Question

我正在使用 gem 版本 2.0.7 和 rails 版本 3.0.7。

当我运行 rake db:migrate 命令时，它会抛出以下错误。

$ rake db:migrate --trace
rake aborted!
ERROR: 'rake/rdoctask' is obsolete and no longer supported. Use 'rdoc/task' (ava
c:/Ruby193/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rake/rdoctask.rb:2:in `<top
c:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/tasks/documentation
c:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/tasks/documentation
c:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/tasks.rb:15:in `loa
c:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/tasks.rb:15:in `blo
c:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/tasks.rb:6:in `each
c:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/tasks.rb:6:in `<top
c:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/application.rb:214:
c:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/application.rb:214:
c:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/application.rb:139:
c:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/application.rb:77:i
C:/Users/m/Documents/Aptana Studio 3 Workspace/rail1/Rakefile:6:in `<top (requir
c:/Ruby193/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rake/rake_module.rb:25:in `l
c:/Ruby193/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rake/rake_module.rb:25:in `l
c:/Ruby193/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rake/application.rb:637:in `
c:/Ruby193/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rake/application.rb:94:in `b
c:/Ruby193/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rake/application.rb:165:in `
c:/Ruby193/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rake/application.rb:93:in `l
c:/Ruby193/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rake/application.rb:77:in `b
c:/Ruby193/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rake/application.rb:165:in `
c:/Ruby193/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rake/application.rb:75:in `r
c:/Ruby193/lib/ruby/gems/1.9.1/gems/rake-10.1.0/bin/rake:33:in `<top (required)>
c:/Ruby193/bin/rake:23:in `load'
c:/Ruby193/bin/rake:23:in `<main>'

如何解决。

请帮帮我。提前致谢

Answer 1

错误信息的关键部分是这样的：

ERROR: 'rake/rdoctask' is obsolete and no longer supported. Use 'rdoc/task' (ava

如果您在 StackOverflow 或 Google 上搜索错误消息，您会发现至少三个关于同一主题的不同问题，其中包括：

ERROR: 'rake/rdoctask' is obsolete and no longer supported. Use 'rdoc/task' (available in RDoc 2.4.2+) instead

撰写本文时投票最高的答案建议从以下位置编辑您的 Rakefile：

require 'rake'
require 'rake/testtask'
require 'rake/rdoctask'
require 'tasks/rails'

到：

require 'rake'
require 'rake/testtask'
require 'rdoc/task'
require 'tasks/rails'

---

如果我是你，我会尝试将 Rails 升级到 3.2，看看问题是否仍然存在。如果这不是一个选项，那么旧的问题希望会有所帮助。

Answer 2

可以通过安装旧版本的 rake 并卸载当前的 10.1.0 版本来解决：

gem install rake --version 0.8.7
gem uninstall rake --version 10.1.0