Call to a member function toDateTimeString () on null,500 报错跟教程报错不一样?
"message": "Call to a member function toDateTimeString() on null",
"status_code": 500,
"debug": {
"line": 23,
"file": "/home/vagrant/Code/larabbs/app/Transformers/TopicTransformer.php",
"class": "Symfony\\Component\\Debug\\Exception\\FatalThrowableError",
"trace": [
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