laravel Call to a member function addEagerConstraints() on null

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Call to a member function addEagerConstraints() on null

这是laravel的关联关系出问题

原因：你没有返回关联关系，就调用了关联方法

解决：

public function xxx()
    {
        return $this->belongsTo(yyy,‘外键‘);
    }

请 return 出去没有return  肯定报错

 

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