sqlalchemy.exc.ArgumentError: ‘SchemaItem‘ object, such as a ‘Column‘ or a ‘Constraint‘ expected, go
当出现这个错误是，
1.是由于sqlalchemy内置的一些限制产生了冲突，在这里，我们需要检查一下或者更换一下自己所取的一些字段名，避免backref中的名字，与类名冲突
2.检查一下自己的字段，大小写是否注意了
就比我自己上次db.Text 写成了db.text
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