given a setup like

class Parent
  has_many :child_parents
  has_many :children, :through => child_parents
end

and assuming i'd like to store the style of relationship on the
child_parents table, for example

create table child_parents(
  parent_id
  child_id
  is_adopted
)

in otherwords, 'is_adopted' is an attribute of the link between child
and parent, not of the child or parent themselves, how can one access
this simply?

child = parent.children.first
p child.adopted?

is obviously desirable and used to be possible with HABTM
associations.  but that's deprecated.... however there seems to be no
easy way to accomplish something similar with full blown join models.

cheers.
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