Ruby中实现把字符串转换为类的2种方法

pry(main)> 'ChinaMag'.constantize
=> ChinaMag
pry(main)> "Test::Unit".constantize
=> Test::Unit

pry(main)> Object::const_get('ChinaMag')
=> ChinaMag
 
pry(main)> module Foo
pry(main)*   class Bar 
pry(main)*   end   
pry(main)* end 
=> nil
pry(main)> 'Foo::Bar'.split('::').inject(Object) {|o,c| o.const_get c}
=> Foo::Bar