Gone Sail wrote:
> right this sounds like what i need to do. so your association tables (AB 
> and AC) have their own unique ids? Xlink is the polymorphic link from AB 
> and AC to the X table elements? so the Xlink table will have an 
> xlinkable type and id along with the X table id? thanks.

Yup.

AB or AC would have:
  id
  a_id
  b_id or c_id
  plus other fields

xlink would have:
  id (the xlink record id)
  x_id (the id of the related X record)
  xlinkable_id (this is the id of the AB/AC join record)
  xlinkable_type (this is the class name "AB"/"AC" of the join record)

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