django.db.utils.DataError: (1406, “Data too long for column ‘username‘ at row 1“)

django.db.utils.DataError: (1406, “Data too long for column ‘username’ at row 1”)
用户首页配置好，输入用户名点击修改

django.db.utils.DataError: (1406, “Data too long for column ‘username‘ at row 1“)

错误提示：DataError
1406“Data too long for column ‘username’ at row 1”

django.db.utils.DataError: (1406, “Data too long for column ‘username‘ at row 1“)
返回用户首页配置，重新输入用户名，点击修改，
未报错，这里的长度限制在model底层开发的时候限定的，

可以看到username的最大长度为16

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