Rails Model has_many with multiple foreign_keys

Question

Relatively new to rails and trying to model a very simple family \"tree\" with a single Person model that has a name, gender, father_id and mother_id (2 parents). Below is b

Answer 1

Used named_scopes over the Person model do this:

class Person < ActiveRecord::Base

    def children
      Person.with_parent(id)
    end

    named_scope :with_parent, lambda{ |pid| 

       { :conditions=>["father_id = ? or mother_id=?", pid, pid]}
    }
 end