sqlalchemy.exc.DataError: (psycopg2.errors.InvalidTextRepresentation) 类型 integer 的输入语法无效：“无”

Question

I am developing the Web Application in Flask built on top of Docker images. One image stores the Postgres Database. I am struggling with inserting None into the Integer column defined followingly:

release = db.Column(db.Integer, nullable=True)

Row initialization:

    def __init__(self, name: str, env: str, mode: ExecutionMode, status: ExecutionStatus, date: datetime, user_id: int,
                 release_id: int):
        self.execution_name = name
        self.environment = env
        self.execution_mode = mode
        self.execution_status = status
        self.execution_date = date
        self.user_id = user_id
        self.release = release_id

        db.session.add(self)
        db.session.commit()

Caller's method:

    if request.method == "POST":
        execution = Execution(name=data['result']['name'], env=Environment[data['result']['env']],
                              mode=ExecutionMode[data['result']['mode']],
                              status=ExecutionStatus[data['result']['status']],
                              date=datetime.datetime.strptime(data['result']['date'], "%Y-%m-%d %H:%M:%S.%f"),
                              user_id=current_user.id,
                              release_id=(data['result']['release'] if data['result'][
                                                                           'release'] != "null" else sqlalchemy.null()))

Whenever I encounter the case, that the value of the Release is None , the following exception is triggered:

sqlalchemy.exc.DataError: (psycopg2.errors.InvalidTextRepresentation) invalid input syntax for type integer: "None"

Does anyone know, how to insert the None respectively NULL value into the database?

Thank you for any help.

Answer 1

The problem is actually on the front-end in the form that accepts the data. There was supposed to be the value of "null" in the select box; however, "None" was the value of the select. I missed that. It seems that the issue is solved.