Python 如何使用Flask Marshmallow将嵌套模式连接到一个JSON对象中
将两个模式连接到一个嵌套JSON对象时遇到问题。此API返回JSON作为3个相关表联接查询的结果。在完成查询之后,我使用了两个Marshmellow模式作为引用。但反应并非如预期,以下是反应:Python 如何使用Flask Marshmallow将嵌套模式连接到一个JSON对象中,python,json,flask,flask-sqlalchemy,marshmallow,Python,Json,Flask,Flask Sqlalchemy,Marshmallow,将两个模式连接到一个嵌套JSON对象时遇到问题。此API返回JSON作为3个相关表联接查询的结果。在完成查询之后,我使用了两个Marshmellow模式作为引用。但反应并非如预期,以下是反应: { "message": "success", "device": [ { "device_name": "Kamar Tidur Utama" } ], "sensor": [ { "value": 23.3683, "sens
{
"message": "success",
"device": [
{
"device_name": "Kamar Tidur Utama"
}
],
"sensor": [
{
"value": 23.3683,
"sensor_name": "Temperature"
},
{
"value": 0.0,
"sensor_name": "Motion"
},
{
"value": 90.12,
"sensor_name": "Humidity"
},
{
"value": 15.8667,
"sensor_name": "Current 1"
},
{
"value": 15.0333,
"sensor_name": "Current 2"
}
]
}
我想要的是将“传感器”对象放入“设备”中。很多设备都有这样的传感器:
{
"message": "success",
"device": [
{
"device_name": "Kamar Tidur Utama"
"sensor": [
{
"value": 23.3683,
"sensor_name": "Temperature"
},
{
"value": 0.0,
"sensor_name": "Motion"
},
{
"value": 90.12,
"sensor_name": "Humidity"
},
{
"value": 15.8667,
"sensor_name": "Current 1"
},
{
"value": 15.0333,
"sensor_name": "Current 2"
}
]
}
]
}
以下是我的三个相关模型:
Device.py(一种查询API的方法)
Device.py(两个marshmellow模式)
Device.py(型号级)
Sensor.py(型号级)
SensorData.py(型号级)
您应该为
设备
列表中的每个条目分配传感器
对象。我实现理想结果的愚蠢方式:
@classmethod
def get_设备_传感器(cls):
设备传感器模式=设备传感器模式(多个=真)
传感器值模式=传感器值模式(多个=真)
device=device.query.join(SensorData,device.id==SensorData.device\u id)\
.add_列(Device.name.label('Device_name'))
打印(设备)
sensor=sensor.query.join(SensorData,sensor.id==SensorData.sensor\u id)\
.add_列(Sensor.name.label('Sensor_name')、SensorData.value.label('value'))
res_设备[0]。传感器=传感器
res\u device=device\u sensor\u schema.dump(device,many=True)
如果设备:
返回jsonify({'message':'success','device':res\u device})
其他:
返回{'message':'Table device is empty'},404
更好的方法是使用映射的SQLAlchemy对象。在这种情况下,
Device.sensors\u data
返回jsonify({'message':'success','Device':res\u Device,'sensor':res\u sensor})
->返回jsonify({'message':'success','Device':res\u Device})
,Device sensors=sensor
和res Device Device=Device\u sensor\u schema.dump(Device,many=True)
@needtobe请提供该方法的完整代码好吗?当我试图将这种方法改成这种方法时,它对我没有效果
@classmethod
def get_device_sensor(cls):
device_sensor_schema = DeviceSensorSchema(many=True)
sensor_value_schema = SensorValueSchema(many=True)
device = Device.query.join(SensorData, Device.id == SensorData.device_id)\
.add_columns(Device.name.label('device_name'))
print(device)
sensor = Sensor.query.join(SensorData, Sensor.id == SensorData.sensor_id)\
.add_columns(Sensor.name.label('sensor_name'), SensorData.value.label('value'))
res_device = device_sensor_schema.dump(device, many=True)
res_sensor = sensor_value_schema.dump(sensor, many=True)
if device:
return jsonify({'message': 'success', 'device': res_device, 'sensor': res_sensor})
else:
return {'message': 'Table device is empty'}, 404
class SensorValueSchema(ma.Schema):
sensor_name = fields.String()
value = fields.Float()
ordered=True
class DeviceSensorSchema(Schema):
device_name = fields.String()
sensors = fields.List(fields.Nested(SensorValueSchema))
class Device(db.Model):
__tablename__ = "devices"
id = db.Column(db.Integer, primary_key=True)
user_id = db.Column(db.Integer, db.ForeignKey('users.id'))
name = db.Column(db.String(255))
serial_number = db.Column(db.String(255), unique=True)
used_relay = db.Column(db.Integer, default=0)
created_at = db.Column(db.DateTime(timezone=True), server_default=db.func.now())
updated_at = db.Column(db.DateTime(timezone=True), onupdate=db.func.now())
switches = db.relationship('Switch', backref='device', lazy='dynamic')
power_usages = db.relationship('PowerUsage', backref='device', lazy='dynamic')
power_expenses = db.relationship('PowerExpense', backref='device', lazy='dynamic')
behaviors_dataset = db.relationship('BehaviorDataset', backref='device', lazy='dynamic')
usage_histories = db.relationship('UsageHistory', backref='device', lazy='dynamic')
sensors_data = db.relationship('SensorData', backref='device', lazy='dynamic')
notifications = db.relationship('Notification', backref='device', lazy='dynamic')
device_serial_number = db.relationship('DeviceSerialNumber', backref='device', lazy='dynamic')
class Sensor(db.Model):
__tablename__ = "sensors"
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(120))
created_at = db.Column(db.DateTime(timezone=True), server_default=db.func.now())
updated_at = db.Column(db.DateTime(timezone=True), onupdate=db.func.now())
sensors_data = db.relationship('SensorData', backref='sensor', lazy='dynamic')
class SensorData(db.Model):
__tablename__ = "sensors_data"
id = db.Column(db.Integer, primary_key=True)
device_id = db.Column(db.Integer, db.ForeignKey('devices.id'))
sensor_id = db.Column(db.Integer, db.ForeignKey('sensors.id'))
value = db.Column(db.Float)
created_at = db.Column(db.DateTime(timezone=True), server_default=db.func.now())
updated_at = db.Column(db.DateTime(timezone=True), onupdate=db.func.now())