Constant visibility


#1

Hi *,

module Included

def whatever
do_something_with FOO
end

end

module Includer

include Included

class Whatever
FOO = ‘whatever’
end

end

this is not just an example to invent stupid variable names, but a
question.
I would like to include the Included module and have visibility on the
Includer module constants (think about validation, different classes
need different data).
Can you suggest me a way to accomplish that, to have a method inside a
module that checks data inside a class in another module, and define
the rules in the class itself ?
“You’re an idiot you should do like that” answers are welcome :slight_smile:

ngw


#2

On Tue, Dec 30, 2008 at 11:20 PM, Nicholas W.
removed_email_address@domain.invalid wrote:

Hi *,

[snip example code]

Can you suggest me a way to accomplish that, to have a method inside a
module that checks data inside a class in another module, and define the
rules in the class itself ?

This is one approach:

module Included
def whatever
puts self.class::FOO
end
end

module Includer
class Whatever
include Included
FOO = ‘whatever’
end
end

o = Includer::Whatever.new
o.whatever # => “whatever”

Note you have to include the module inside the class - including it in
the enclosing module does not do what you may think :slight_smile:

Regards,
Sean


#3

You might be looking for extend instead of include:

module Foo

def foo

puts self::FooBar::TEST;

end

end

module Bar

extend Foo;

class FooBar

TEST = "Whatever";

end

end

Bar.foo; # Prints out “Whatever”

See if it works for you