Ruby on Rails

Hi,
I'm developing with ruby-1.9. 1 rails 3.0.0.
I want to relate 'User' model and 'Payment' model with condition which
has the same value as 'user.testing' in 'payment.testing'

I did

Class User < ActiveRecord::Base
has_many payments, :conditions => ['testing = ?', self.testing]
end

This doesn't work.
I tried also below, but doesn't work too.
has_many payments, :conditions => ['testing = ?',
#{self.send(:testing)}]

Any ideas?

Regards.

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