Colin,

======================== price.rb ===========================
  class Price < ActiveRecord::Base
  belongs_to :equities
 ....
  end
========================equitiy.rb==========================
class Equity < ActiveRecord::Base
  after_initialize :clean_up
  after_update :clean_up

  belongs_to :issuer
  has_many :prices
  ...
end
=======================issuer.rb=============================
class Issuer < ActiveRecord::Base
  after_initialize :clean_up
  after_update :clean_up
  
  validates_uniqueness_of :cik

  has_many :filings
  has_many :equities
  has_many :former_names
 ....
end



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