If you have a symbol and need to convert it to a constant, perhaps because of some metaprogramming induced by a polymorphic solution, then you may start off on an approach like the following. In fact, I've seen a number of StackOverflow solutions like this.
:module.to_s.capitalize.constantize #=> Module
That is great for one-word constant names, but what about multi-word
OpenStruct. This approach will not work for the symbol
:open_struct. We need a more general solution.
The key is to ditch
#capitalize and instead use another ActiveSupport method,#classify`.
ruby :open_struct.to_s.classify.constantize #=> OpenStruct