GORM：什么是引用：在Grails域类映射块中为true？

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问题描述

  它看起来像参考  $ b 
当 true 时，相关文件被，如果 false ，GORM插入简单的 id ，又名手动引用在mongo中
 
public class Address {
    static mapWith = "mongo"

    Region region;
    Zone zone;

    static mapping = {
        id generator: 'identity'
        region reference:true
        zone reference:true
    }
}
I'm interested in knowing what reference:true does.
In my experience, leaving it off gives exactly the same result except  there's no DBRef in the actual mongo document.
 解决方案 
It looks like reference controlls how documents are linked. 
When true, the related documents are referenced by db-refs, if false, GORM inserts simple id, aka Manual references in mongo
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