activerecord/lib/active_record/associations/preloader/collection_association.rb


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module ActiveRecord
  module Associations
    class Preloader
      class CollectionAssociation < Association #:nodoc:
        private

        def preload(preloader)
          associated_records_by_owner(preloader).each do |owner, records|
            association = owner.association(reflection.name)
            association.loaded!
            association.target.concat(records)
            records.each { |record| association.set_inverse_instance(record) }
          end
        end
      end
    end
  end
end