Dynamically access class constants?

Ruby
1

I’ve been looking for a method similar to:

Obj.send(:method)

but to access class constants. So if I have:

class MyObj
MY_CONSTANT_1
end

I want to access MyObj::MY_CONSTANT_1 by using a variable like foo =
MY_CONSTANT_1 and then MyObj::send(:foo), but obviously send is only
meant to work with methods and not constants.

Is there any way to do this? I’ve looked but am having difficulty
finding anything.

Thanks,
Marli

2

Marli Ba wrote:

I want to access MyObj::MY_CONSTANT_1 by using a variable like foo =
MY_CONSTANT_1 and then MyObj::send(:foo), but obviously send is only
meant to work with methods and not constants.

Is there any way to do this? I’ve looked but am having difficulty
finding anything.

Thanks,
Marli

I am slightly confused by your example, but you definitely need
Module#const_get:
http://www.ruby-doc.org/core/classes/Module.html#M001689

irb(main):001:0> class A
irb(main):002:1> B = 1
irb(main):003:1> end
=> 1
irb(main):004:0> A.const_get(:B)
=> 1

-Justin

3

Justin C. wrote:

I am slightly confused by your example, but you definitely need
Module#const_get:
class Module - RDoc Documentation

irb(main):001:0> class A
irb(main):002:1> B = 1
irb(main):003:1> end
=> 1
irb(main):004:0> A.const_get(:B)
=> 1

-Justin

Ah, sorry for the confusion. const_get is exactly what I was looking
for though, thanks!

4

class MyObj
MY_CONSTANT_1 = “hello”
end
=> “hello”

c = “MY_CONSTANT_1”
=> “MY_CONSTANT_1”

MyObj.const_get©
=> “hello”