Hello Rails team,

I posted this question in the Ruby on Rails Talk mailing list a week ago. 
However, I wasn't able to get a lot of replies there. I'm hoping I'd have 
better luck here :)

Our team lead and I recently discussed the pros and cons of breaking up a 
long source file into multiple source files. I tend to prefer one class per 
file, because I find the individual files easier to read and easier to find 
(with ctrl-p in Sublime). On the other hand, our team lead doesn't have 
issues with long source files. He argues that they are quite common in 
open-source projects. As an example, he pointed to the 
ActionDispatch::Routing::Mapper 
<https://github.com/rails/rails/blob/e47e8e915e733177fe1dee2c67bef1724bbba553/actionpack/lib/action_dispatch/routing/mapper.rb>
 class in Rails as a case of a long file with multiple inline classes.

I'm curious to learn the intent behind keeping all the contents of Mapper 
class within a single file. What were the advantages of taking this 
approach?

Thanks,

George Mendoza
Philippines

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