Rails 3.0.5 中没有 deprecated_block_helpers
当我尝试在 Rails 3.0.5 上启动生产服务器时，我不断收到此错误：
/var/lib/gems/1.8/gems/activesupport-3.0.5/lib/active_support/core_ext/module/introspection.rb:70:in `const_get': no such file to load -- action_view/helpers/deprecated_block_helpers (LoadError)
from /var/lib/gems/1.8/gems/activesupport-3.0.5/lib/active_support/core_ext/module/introspection.rb:70:in `local_constants'
from /var/lib/gems/1.8/gems/activesupport-3.0.5/lib/active_support/core_ext/module/introspection.rb:70:in `each'
from /var/lib/gems/1.8/gems/activesupport-3.0.5/lib/active_support/core_ext/module/introspection.rb:70:in `local_constants'
from /var/lib/gems/1.8/gems/activesupport-3.0.5/lib/active_support/core_ext/module/introspection.rb:68:in `each'
from /var/lib/gems/1.8/gems/activesupport-3.0.5/lib/active_support/core_ext/module/introspection.rb:68:in `local_constants'
from /var/lib/gems/1.8/gems/activesupport-3.0.5/lib/active_support/core_ext/module/introspection.rb:86:in `local_constant_names'
from /var/lib/gems/1.8/gems/activesupport-3.0.5/lib/active_support/dependencies.rb:100:in `new_constants'
from /var/lib/gems/1.8/gems/activesupport-3.0.5/lib/active_support/dependencies.rb:91:in `each'
from /var/lib/gems/1.8/gems/activesupport-3.0.5/lib/active_support/dependencies.rb:91:in `new_constants'
from /var/lib/gems/1.8/gems/activesupport-3.0.5/lib/active_support/dependencies.rb:599:in `new_constants_in'
from /var/lib/gems/1.8/gems/activesupport-3.0.5/lib/active_support/dependencies.rb:225:in `load_dependency'
from /var/lib/gems/1.8/gems/activesupport-3.0.5/lib/active_support/dependencies.rb:239:in `require'
from /home/punkweek/punkweek/config.ru:3
from /var/lib/gems/1.8/gems/rack-1.2.2/lib/rack/builder.rb:46:in `instance_eval'
from /var/lib/gems/1.8/gems/rack-1.2.2/lib/rack/builder.rb:46:in `initialize'
from /home/punkweek/punkweek/config.ru:1:in `new'
from /home/punkweek/punkweek/config.ru:1
似乎文件 deprecated_block_helpers 有问题，在 Rails 中找不到该文件。有人知道如何解决这个问题吗？
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实际上这是 Rails 3.0.5 中的一个错误（已在 Edge 中修复）。
DeprecatedBlockHelpers 在 ActionView::Helpers 中自动加载，但文件本身已在 9de8305
这个助手 中删除旨在显示使用
<% %>而不是<%= %>（或-而不是对于某些块，=in haml）。我不确定弃用到底是针对哪些块，但也许可以查看一下您的模板，看看是否可以通过反复试验来使其正常工作。或者，您可以供应 Rails 并删除 DeprecatedBlockHelpers 自动加载，或跟踪边缘 Rails。
Actually this is a bug in Rails 3.0.5 (it has been fixed in edge).
DeprecatedBlockHelpers is autoloaded in ActionView::Helpers, but the file itself was removed in 9de8305
This helper was designed to show a deprecation notice for using
<% %>instead of<%= %>(or-instead of=in haml) for certain blocks. I'm not sure exactly which blocks the deprecation is for, but maybe take a look through your templates and see if you can trial-and-error this into working.Alternatively, you can vendor Rails and remove the DeprecatedBlockHelpers autoload, or track edge Rails.