Visual Studio Code – Flask – sqlalchemy.exc.StatementError: (builtins.TypeError) Not a boolean value: 'False'

I want to get the Default value of OnlineAvailability as True. By default, all Doctors will have all Slot Timings Available.

If I give the JSON Body data in Postman and POST the data:

http://127.0.0.1:8000/online

{
    "OnlineTimeSlot": "18:30"
}

Here, OnlineAvailability is being set to true by default and I get the message:

{
    "message": "New Time Slot, 18:30 added!"
}

When I GET the data, it shows:

http://127.0.0.1:8000/online/16

{
    "OnlineScheduleId": 16,
    "OnlineTimeSlot": "18:30",
    "OnlineAvailability": true
}

But,
If I want to give the OnlineAvailability as false and POST the data or If I want to update the existing Timings Data using the PUT method in Postman JSON body:

http://127.0.0.1:8000/online

{
    "OnlineTimeSlot": "18:30",
    "OnlineAvailability": false
}

Then, I am getting the error:

sqlalchemy.exc.StatementError: (builtins.TypeError) Not a boolean value: ‘False’
[SQL: INSERT INTO "OnlineSchedules" ("OnlineTimeSlot", "OnlineAvailability") VALUES (?, ?)] [parameters: [{‘OnlineTimeSlot’: ’18:30′, ‘OnlineAvailability’: ‘False’}]] // Werkzeug Debugger

How do I change the default value from true to false or upload a new Time Slot with OnlineAvailability as false without getting the above error? (The value should be recognised as a Boolean Value instead of a String)

online.py –> models

# omitted code

class OnlineScheduleModel(db.Model):
    
    # omitted code

    OnlineTimeSlot = db.Column(db.String(500), unique=True, nullable=False)
    OnlineAvailability = db.Column(db.Boolean, nullable=False, default=True, server_default="true")

    def __init__(self, OnlineTimeSlot, OnlineAvailability):
        self.OnlineTimeSlot = OnlineTimeSlot
        self.OnlineAvailability = OnlineAvailability

    def json(self):
        return {"OnlineScheduleId": self.OnlineScheduleId, "OnlineTimeSlot": self.OnlineTimeSlot, "OnlineAvailability": self.OnlineAvailability}

# ommitted code

online.py –> resources

# omitted code

class OnlineScheduleInfo(Resource):

    parser = reqparse.RequestParser()

    parser.add_argument("OnlineTimeSlot", required=True)
    parser.add_argument("OnlineAvailability", required=False)

    # omitted code
    @cross_origin(supports_credentials=True)
    def post(self):
        data = OnlineScheduleInfo.parser.parse_args()
        schedule = OnlineScheduleModel(**data)
        if OnlineScheduleModel.find_by_timeslot(data['OnlineTimeSlot']):
            return {"message": "A timeslot '{}' already exists".format(data['OnlineTimeSlot'])}, 400
        # omitted code

        schedule.save_to_db()
        
        # omitted code

        return {"message": "New Time Slot, {} added!".format(data['OnlineTimeSlot'])}, 200
  
    @cross_origin(supports_credentials=True)
    def put(self):
        data = OnlineScheduleInfo.parser.parse_args()
        schedule = OnlineScheduleModel.find_by_timeslot(data['OnlineTimeSlot'])
        if schedule is None:
            schedule = OnlineScheduleModel(**data)
        else:
            schedule.OnlineAvailability = data["OnlineAvailability"]
        schedule.save_to_db()
        return {"message": "schedule, {} Updated!".format(data['OnlineTimeSlot'])}, 200

Basically, My requirement is that I should be able to POST or PUT data with OnlineAvailability as false, and I should get the output in Postman for GET:

http://127.0.0.1:8000/online/16

{
    "OnlineScheduleId": 16,
    "OnlineTimeSlot": "18:00",
    "OnlineAvailability": false
}