Discussion on: Flask Vue.js Integration Tutorial

@tray_bp.route('/tray')
def get(self):
    if request.headers.get('code') is not None:
        code = format_and_lower_str(request.headers['code'])()
        tray = TrayResource.get_tray(code)
        data = marshal(tray, self.fields)
        return render_template('index.html')
        #return BaseResource.send_json_message(data, 200)
    else:
        trays = Tray.query.all()
        data = marshal(trays, self.fields)
        return BaseResource.send_json_message(data, 200)

@jwt_required
def post(self):
    args = TrayResource.tray_parser()
    rack = int(args['rack'])
    number = int(args['number'])
    code = format_and_lower_str(args['code'])()

    if not Tray.tray_exists(code):
        try:
            tray = Tray(rack_id=rack, number=number, code=code)
            BaseModel.db.session.add(tray)
            BaseModel.db.session.commit()
            log_create(tray)
            return BaseResource.send_json_message("Added new tray", 201)

        except Exception as e:
            current_app.logger.error(e)
            BaseModel.db.session.rollback()
            return BaseResource.send_json_message("Error while adding tray", 500)
    log_duplicate(Tray.query.filter(Tray.code == code).first())
    return BaseResource.send_json_message("Tray already exists", 500)

@jwt_required
@has_required_request_params
def put(self):
    code = format_and_lower_str(request.headers['code'])()
    tray = TrayResource.get_tray(code)
    if tray is not None:
        args = TrayResource.tray_parser()
        rack = int(args['rack'])
        number = int(args['number'])
        code = format_and_lower_str(args['code'])()

        if rack != tray.rack_id or number != tray.number or code != tray.code:
            try:
                tray.rack_id = rack
                tray.number = number
                tray.code = code
                BaseModel.db.session.commit()
                log_update(tray, tray)  # todo: log old record
                return BaseResource.send_json_message("Updated tray", 202)

            except Exception as e:
                current_app.logger.error(e)
                BaseModel.db.session.rollback()
                return BaseResource.send_json_message("Error while adding tray. Another tray has that number", 500)
        return BaseResource.send_json_message("No changes made", 304)
    return BaseResource.send_json_message("Tray not found", 404)

@jwt_required
@has_required_request_params
def delete(self):
    code = format_and_lower_str(request.headers['code'])()
    tray = TrayResource.get_tray(code)

    if not tray:
        return BaseResource.send_json_message("Tray not found", 404)

    BaseModel.db.session.delete(tray)
    BaseModel.db.session.commit()
    log_delete(tray)
    return BaseResource.send_json_message("Tray deleted", 200)

@staticmethod
def tray_parser():
    parser = reqparse.RequestParser()
    parser.add_argument('rack', required=True)
    parser.add_argument('number', required=True)
    parser.add_argument('code', required=True, type=non_empty_string)

    args = parser.parse_args()
    return args

@staticmethod
def get_tray(code):
    return BaseModel.db.session.query(Tray).filter_by(code=code).first()