_substitute_values

# File activerecord/lib/active_record/relation.rb, line 1373
      def _substitute_values(values)
        values.map do |name, value|
          attr = table[name]
          if Arel.arel_node?(value)
            if value.is_a?(Arel::Nodes::SqlLiteral)
              value = Arel::Nodes::Grouping.new(value)
            end
          else
            type = klass.type_for_attribute(attr.name)
            value = predicate_builder.build_bind_attribute(attr.name, type.cast(value))
          end
          [attr, value]
        end
      end