The metaprogram is no longer of any use because the change must be made at a lower level.
这样一来元编程就没有任何作用了，因为这些修改必须在更低的层次上进行。
This method instructs Grails to metaprogram the validation methods onto the specified domain class as it would normally during run time.
此方法指示Grails将验证方法元编程到指定的域类上，就像通常在运行时所做的一样。
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