Accessing class constants in included modules

module Foo
def display
puts self.class::A
end
end

class Bar
A = 5
include Foo
end

class Baz
A = 6
include Foo
end

Bar.new.display
Baz.new.display

Anything cleaner-looking than self.class::Constant to access the
constant from a method defined in the module?

martin

Martin DeMello wrote:

constant from a method defined in the module?

martin

Here’s a trick I use to beautify access to constants:

class Object
def my
self.class
end
end

…Now all constants can be accessed with my::Constant.

I find it more readable. Certainly less typing!

Cheers,
Tom A.

On 11/9/06, Tom A. [email protected] wrote:

I find it more readable. Certainly less typing!
Ah - nice!

martin

Martin DeMello wrote:

…Now all constants can be accessed with my::Constant.

I find it more readable. Certainly less typing!

Ah - nice!

This may be a corner case, but if you’re going to define #my at the
instance level, it should probably be based on the
(singleton|eigen)class of the instance and not the “birth” class:

class Object
def my
self.class
#class << self; self; end
end
end

class Foo
C = 2
end

x = Foo.new
class << x
X = 3
end

p x.my::C
p x.my::X

Now try it with the alternative!

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