Question

让我稍微回溯一下-问题实际上是在使用我们拥有的MentorSchema初始化Mentor时发生的：

class Mentor(db.Model):
    __tablename__ = 'mentors'
    id = db.Column(db.Integer, primary_key=True)
    id_project42 = db.Column(db.Integer, db.ForeignKey('projects.id'), nullable=False)
    id_user42 = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False)
    finalmark = db.Column(db.Integer, nullable=False, server_default=0)
    totalappointments = db.Column(db.Integer, nullable=False, server_default=0)

    def __init__(self, id_project42, id_user42, finalmark):
        self.id_project42 = id_project42
        self.id_user42 = id_user42
        self.finalmark = finalmark
        self.totalappointments = 0

class MentorSchema(ma.ModelSchema):
    class Meta:
        model = Mentor

因此，如果我有d = { "id_project42": 101, "id_user42": 57, "finalmark": 86}，而我尝试mentor_schema.dump(d)，则id_project42和id_user42都消失了，我得到一个错误消息：TypeError: __init__() missing 2 required positional arguments: 'id_project42' and 'id_user42'

我们正在使用的实际代码在这里：

class ApiUserInit(Resource):
    def post(self, userId):
        data = Api42.userProjects(userId)    # Returns a list of dicts
        if data is None:
            return formatError('Error', 'No projects found for user')
        for d in data:
            print(d)    # prints {"id_project42": 101, "id_user42": 57, "finalmark": 86}
            mentor_schema = MentorSchema()
            newMentor, errors = mentor_schema.load(d) # Only loading the "finalmark"!!!!!!
            if errors:
                return internalServiceError()
            db.session.add(newMentor)
        db.session.commit()
        return {"status":"mentor initialization successful"}, 201

请告知我使用模式的方式是否存在问题。

Answer 1

默认情况下，调用架构的转储方法时将不包含外键。您需要在架构include_fk = True类上设置Meta：

class MentorSchema(ma.ModelSchema):
    class Meta:
        model = Mentor
        include_fk = True

更多信息：marshmallow-sqlalchemy API reference

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