include_in_memory?(record) private

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# File activerecord/lib/active_record/associations/collection_association.rb, line 540
        def include_in_memory?(record)
          if reflection.is_a?(ActiveRecord::Reflection::ThroughReflection)
            owner.send(reflection.through_reflection.name).any? { |source|
              target = source.send(reflection.source_reflection.name)
              target.respond_to?(:include?) ? target.include?(record) : target == record
            } || target.include?(record)
          else
            target.include?(record)
          end
        end
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