jwt-example doesn't work with mysql

Hi I'm testing the jwt - todo sample and it's working over memory database but when I use it with a Msql database I have this response

"error": {
"statusCode": 422,
"name": "ValidationError",
"message": "La instancia User no es válida. Detalles: password can't be blank (value: undefined).",
"details": {
"context": "User",
"codes": {
"password": [
"presence"
]
},
"messages": {
"password": [
"can't be blank"
]
}
}
}
}

BUT I have made the request with password field

{
"email": "tafa@kk.eg",
"password": "123456789854"
}

Start by reproducing the jwt-todo sample with MySQL and compare its behavior with the in-memory database using the request shown in the issue. Inspect the sample's User handling and MySQL setup to determine why the submitted password is reported as undefined. Done when the same request validates successfully with MySQL and the sample's authentication flow works.