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active_record_primary_key() public

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# File activerecord/lib/active_record/reflection.rb, line 537
      def active_record_primary_key
        custom_primary_key = options[:primary_key]
        @active_record_primary_key ||= if custom_primary_key
          if custom_primary_key.is_a?(Array)
            custom_primary_key.map { |pk| pk.to_s.freeze }.freeze
          else
            custom_primary_key.to_s.freeze
          end
        elsif active_record.has_query_constraints? || options[:query_constraints]
          active_record.query_constraints_list
        elsif active_record.composite_primary_key?
          # If active_record has composite primary key of shape [:<tenant_key>, :id], infer primary_key as :id
          primary_key = primary_key(active_record)
          primary_key.include?("id") ? "id" : primary_key.freeze
        else
          primary_key(active_record).freeze
        end
      end
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