[Rails] dynamic :conditions for activerecord associations?

Hello.

I'm facing the problem where I have something like this:
class Person
has_many :things,
:conditions => "dynamic conditions depending of the object"
end

So, the problem is that i would like to have a dynamic condition which
depends upon the object. In my particular case, it is something like
this:
has_many :things,
:conditions => {:country_code => 'country_code_string'}

So, let's say that the country_code_string might be 'UK', 'US' and so
on. How can I make this kind of association? I tried lambda, like i
could use in before_add, after_add and other callbacks, but then it
seems that Proc object's string representation is used in WHERE
clause. Is there even possible to have such thing or should i use
something like:
has_many :thingsUS,
:conditions => {:country_code => 'US'}
has_many :thingsUK,
:conditions => {:country_code => 'UK'}
...

It doesn't feel much of an elegant solution to me. Better ideas how to
solve this problem?

Jarmo

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