get self as invoking class in parent in Ruby -

my first class has constant. want make work somehow dynamic value.

class post < activerecord::base   test = ["#{self.name}", "test1"] end   class fakepost < post end 

in rails console trying access test constant fakepost still show self "post" object. there way achieve this?

current:

irb(main):004:0> fakepost::test

=> ["post", "test1"]

but want return result when access constant through post not vi fakepost.

expected:

irb(main):004:0> fakepost::test

=> ["fakepost", "test1"]

the problem code test = ["#{self.name}", "test1"] interpreted once, when post class instantiated. after fixed ["post", "test1"].

off top of head can't think of way of making work constant, if replace class method works fine:

class post   def self.test     [self.name, "test1"]   end end  class fakepost < post end  post.test #=> ["post", "test1"]  fakepost.test #=> ["fakepost", "test1"] 

the reason works code inside class method interpreted @ run time (i.e. when call method), rather when class interpreted. timeline both cases follows:

with test constant:

1. post class instantiated , interpreted line line.
2. self.name interpreted , returns 'post', self post class.
3. post::test set irrevocably ["post", "test1"]
4. fakepost class instantiated , inherits post, including already-instantiated test constant of ["post", "test1"]
5. fakepost::test == post::test == ["post", "test1"] #=> true

with test class method:

1. post class instantiated , interpreted line line.
2. post class method test added (but not interpreted yet).
3. fakepost class instantiated , inherits test class method post. still hasn't been interpreted yet.
4. when run post.test or fakepost.test method interpreted. self either post or fakepost depending on class called test method.