Question

Can a Rails class name contain numbers? For example:

class Test123
end

Is this a valid class? I get an uninitialized constant Test123 error when I try to load the class.

Answer 1

I think Artem Kalinchuk’s last comment deserves to be the answer of this misworded question.

A Ruby class name can contain numbers.

A Rails class has to be defined in a correctly named file. If I define a class called NewYear2012Controller:

Correct file name: new_year2012_controller.rb
Incorrect file name: new_year_2012_controller.rb (note the extra underscore)

Because this is how Rails inflector and auto-loading works.