Call to a member function addEagerConstraints() on null
Call to a member function addEagerConstraints() on null 加上 return 就行了 ...
原文：fastadmin 错误提示Call to a member function exams() on null
这个是我关联模型时，定义的关联方法 为什么提示不存在呢 解答 这个函数是存在的 只是，不能被空对象调用 所以，请检查，调用者，是不是空对象 ...
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