ruby-on-rails – needle / definition-context.rb：36：警告：取消定义`initialize’可能会导致严重的问题

我在导轨3.1中安装了一个新的宝石针.

它正确安装,但是当我使用命令rails server –debugger启动我的rails时

我收到以下警告：

.rvm/gems/ruby-1.9.2-p290/gems/needle-1.3.0/lib/needle/deFinition-context.rb:36: warning: undefining `initialize' may cause serIoUs problems
.rvm/gems/ruby-1.9.2-p290/gems/needle-1.3.0/lib/needle/deFinition-context.rb:36: warning: undefining 'object_id' may cause serIoUs problems
.rvm/gems/ruby-1.9.2-p290/gems/needle-1.3.0/lib/needle/deFinition-context.rb:36: warning: undefining '__send__' may cause serIoUs problems

我怎么能摆脱它？

解决方法

问题在于针宝石本身.它这样做：

public_instance_methods -
[ "instance_eval","object_id","__id__","__send__","initialize","remove_const","method_missing","method","class","inspect","to_s","instance_variables","block_given?" ]

但是在Ruby 1.9中,public_instance_methods方法返回Symbol变体的对象,而不是String.那么有效的是：

[:__send__,<and other methods>] - ["__send__",<and other methods>]
=> [:__send__,<and other methods>]

什么时候不应该删除提供的数组中的那些方法.

这向我表明该库尚未针对Ruby 1.9进行更新(或至少已经过测试).我建议找到这个库的代码,分叉它然后应用一个补丁,使用map(&：to_sym)之类的东西将数组转换为符号来解决这个问题.

但请注意：可能存在其他情况,即1.8和1.9之间存在这些差异.