ruby on rails - Many to Many association with Single table inheritance -

i looking many-to-many association within child models. below. can please guide what's best way it.

parent

class < activerecord::base end

child1

class b <   has_many :bc   has_many :c ,through: :bc end

child2

  class c <     has_many :bc     has_many :b, through: :bc   end

if don't need columns, use has_and_belongs_to_many can read http://guides.rubyonrails.org/association_basics.html

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