delete_records(records, method) private

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# File activerecord/lib/active_record/associations/has_many_through_association.rb, line 104
        def delete_records(records, method)
          ensure_not_nested

          through = owner.association(through_reflection.name)
          scope   = through.scoped.where(construct_join_attributes(*records))

          case method
          when :destroy
            count = scope.destroy_all.length
          when :nullify
            count = scope.update_all(source_reflection.foreign_key => nil)
          else
            count = scope.delete_all
          end

          delete_through_records(through, records)

          if through_reflection.macro == :has_many && update_through_counter?(method)
            update_counter(-count, through_reflection)
          end

          update_counter(-count)
        end
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