According to the docs, class_attribute does implement inheritance for
class instance variables. However, it doesn't work as it is intended
to, at least if you use "mutual structures", like Hash.
Base.foo = {}
Subclass.foo[:bar] = "bar"
Base.foo # => {:bar => "bar"}
I'm sorry, but this is WRONG and dangerous. The docs tell me to "use
setters" here - not sure how this is supposed to work.
Another "solution" is to initialize the ivar in the subclass, again,
as done here: https://github.com/rails/rails/commit/09195f10bd3
SO, if I need to initialize the ivar, I don't need inheritance. Why is
that called "inheritance" at all?
By accident I solved this with a 10-liner months ago, why not use
something like that?
https://github.com/apotonick/hooks/blob/master/lib/hooks/inheritable_attribute.rb
It's simple, clean and does exactly what you expect.
I just found out class_attribute nearly broke my code, so all I want
is prevent people from stepping into that trap, too :-D
Cheers!
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