求教大神 TP框架3.2.2 relation参数 只有为true时，才有数据；而当参数为表名时，没有数据。
关联模型：
控制器（参数为表名）：
参数为true时，有数据，如图
参数为表名时，无数据，如图
回复讨论(解决方案)
今天也遇到relation相关问题，百度到这里了，发现还没人回答。
填一下坑，让后来人看看。
原因应该是，由于关联里定义了mapping_name，所以D()->relation()的时候，要给relation传入mapping_name(cat)，而不是关联名(Category)。
要给relation传入关联名的话，不能定义mapping_name
发现楼主写的有问题。
关联名写成和Model名一样
而且class_name也是那个，这是要把自身和自身关联么
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