Rails "NameError uninitialized constant class" Solution
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在lib文件中写了一个uuid_hepler.rb文件，加载到每个modle中改变主键id为uuid,
model中加载此class: include UUIDHelper
报错：
NameError (uninitialized constant Movie::UUIDHelper):解决办法：
在application.rb中加入：
config.autoload_paths += %W(#{config.root}/lib) 0 0
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