flask-marshmallow 嵌套架构不适用

Question

我目前正在使用 API 获取请求 return 2 个模型的连接 json 数据，这些数据与使用 flask、sqlalchemy 和 flask-sqlalchemy（到query）和 flask-marshmallow（序列化为 JSON）

我的模特：

class Recording(Base):
    __tablename__ = 'recordings'

    id = Column(Integer, primary_key=True)
    filepath = Column(String, nullable=False)

    language_id = Column(Integer, ForeignKey('languages.id'), nullable=False)
    language = relationship("Language", back_populates="recordings")

    user_id = Column(Integer, ForeignKey('users.id'), nullable=False)
    user = relationship("User", back_populates="recordings")

    created_at = Column(DateTime, nullable=False, default=func.now())
    updated_at = Column(DateTime, nullable=False,
                        default=func.now(), onupdate=func.now())
    deletedd_at = Column(DateTime, nullable=True)

    def __repr__(self):
        return 'id: {}'.format(self.id)

User.recordings = relationship("Recording", order_by=Recording.id, back_populates="user")
Language.recordings = relationship("Recording", order_by=Recording.id, back_populates="language")


class RecordingResult(Base):
    __tablename__ = 'recording_results'

    id = Column(Integer, primary_key=True)
    is_with_dictionary = Column(Boolean, default=False)
    result = Column(String, nullable=True)
    run_time = Column(Float, default=0.0)

    recording_id = Column(Integer, ForeignKey('recordings.id'), nullable=False)
    recording = relationship("Recording", back_populates="recording_results", lazy="joined")

    speech_service_id = Column(Integer, ForeignKey('speech_services.id'), nullable=False)
    speech_service = relationship("SpeechService", back_populates="recording_results")

    created_at = Column(DateTime, nullable=False, default=func.now())
    updated_at = Column(DateTime, nullable=False,
                        default=func.now(), onupdate=func.now())
    deletedd_at = Column(DateTime, nullable=True)

    def __repr__(self):
        return 'id: {}'.format(self.id)

Recording.recording_results = relationship("RecordingResult", order_by=RecordingResult.id, back_populates="recording", lazy="joined")
SpeechService.recording_results = relationship("RecordingResult", order_by=RecordingResult.id, back_populates="speech_service")

我的架构：

class RecordingResultItemSchema(ma.Schema):
    class Meta:
        model = RecordingResult
        fields = ('id', 'is_with_dictionary', 'result', 'run_time', 'recording_id', 'speech_service_id')

class RecordingItemSchema(ma.Schema):
    class Meta:
        model = Recording
        fields = ('id', 'filepath', 'language_id', 'user_id', 'recording_results')  
    recording_results = ma.Nested(RecordingResultItemSchema)
recording_item_schema = RecordingItemSchema()
recording_items_schema = RecordingItemSchema(many=True)
recording_result_item_schema = RecordingResultItemSchema()
recording_result_items_schema = RecordingResultItemSchema(many=True)

Recording模型有多个RecordingResult（外键为recording_id）

我在 API 中使用此查询使用 sqlalchemy 的 'lazy' 来获取 2 个模型的连接数据：

@app.route('/recording', methods=['GET'])
def get_recording_item():
    if db.session.query(Recording).options(joinedload(Recording.recording_results)).all():
        recording_list = db.session.query(Recording).options(joinedload(Recording.recording_results)).all()
        result = recording_items_schema.dump(recording_list)
        return jsonify(result.data), 200
    else:
        return jsonify(msg="Object not found"), 400

通过邮递员发送请求后，我得到了这个错误：

AttributeError: "recording_id" is not a valid field for [id: 1]. // Werkzeug Debugger

在控制台中我得到了这个错误：

'"{0}" is not a valid field for {1}.'.format(key, obj)) app_1
| AttributeError: "recording_id" is not a valid field for [id: 1].

我打印了查询并得到了结果，但是当我尝试使用模式时，字段似乎无效。我按照 flask-marshmallow 的文档使用嵌套对象，我做错了什么？任何帮助将不胜感激

Answer 1

我将架构更改为：

class RecordingResultItemSchema(ma.Schema):
    class Meta:
        model = RecordingResult
        fields = ('id', 'is_with_dictionary', 'result', 'run_time', 'recording_id', 'speech_service_id')

class RecordingItemSchema(ma.Schema):
    class Meta:
        model = Recording
        fields = ('id', 'filepath', 'language_id', 'user_id', 'recording_results')  
    recording_results = ma.Nested(RecordingResultItemSchema, many=True)

现在它起作用了，因为我没有将 many=True 参数放入

flask-marshmallow 嵌套架构不适用

flask-marshmallow nested schema doesn't apply

python

schema

nested

flask

marshmallow