Matt Jones wrote in post #1021972:
On Sep 13, 5:27am, Vogon Primo wrote:
In a legacy schema sometimes we may discover foreign key constraints
that don't follow the simple "FK references PK" rule, but "FK references
UNIQUE column" rule. Is there a way to mapping this with :foreing_key=>
... or some other mechanism with ActiveRecord?
You'll want to specify the relevant field (on both the has_many and
belongs_to) by passing the :primary_key option.

--Matt Jones
Thank you Matt, this is the option that i needed.

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postedSep 19, '11 at 8:41a
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