Best practice: If you want to reduce the execution time, then do not define joins in a rule that filters out the number of records being evaluated by the rule.

最佳实践：如果想要减少执行时间，那么不要在可能过滤掉大量所评估记录的规则中定义连接。

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The transformer carries out a lookup action in non-primary tables for records of the primary table.

对于主表的记录，转换器对非主表进行查找。

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Note: Use the count method to find out how many records are in a QuerySet.

注意：使用count方法可以确定一个QuerySet中有多少记录。

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