Ruby has a scope resolution operation :: the double-colon and is very straightforward to use:
module A
modules B
MY_CONSTANT = 'test'
end
end
puts A::B::MY_CONSTANT # 'test'Great, that’s a well namespaced constant. But, what if you need to refer to a constant on the outer namespace (global namespace) from the module ?
Easy…
MY_CONSTANT = 'on the global scope'
module A
modules B
MY_CONSTANT = 'test'
puts MY_CONSTANT # returns 'test'
puts A::B::MY_CONSTANT # returns 'test'
puts ::MY_CONSTANT # returns 'on the global scope'
end
end
puts A::B::MY_CONSTANT # 'test'
puts MY_CONSTANT # 'on the global scope'
puts ::MY_CONSTANT # 'on the global scope'