adam witt wrote in post #1048895:
> Class Pair
>   belongs_to :individuals, :foreign_key => "individual_a"
>   belongs_to :individuals, :foreign_key => "individual_b"
> end
>
> Class Individual
>  has_many :pairs
> end

This is a classic "repeating groups" database design problem. I don't 
really feel like expending brain cells to explain it. However, as a hint 
look up "database normalization" paying close attention to the "First 
Normal Form (1NF)".

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