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我是烧瓶的新手,并尝试使用用户角色关联服务。我通过以下方式定义了三个数据库模型:

from flask_sqlalchemy import SQLAlchemy

db = SQLAlchemy()

class user(db.Model):
  id = db.Column(db.Integer, primary_key=True)
  ... some other fields
  roles = db.relationship("Role", secondary='user_roles')

class Role(db.Model):
  id = db.Column(db.Integer, primary_key=True)
  role_name = db.Column(db.String(80), unique=True, nullable=False)

class UserRoles(db.Model):
  id = db.Column(db.Integer, primary_key=True)
  user_id = db.Column(db.Integer, db.ForeignKey("user.id", ondelete='CASCADE'), nullable=False)
  role_id = db.Column(db.Integer, db.ForeignKey("role.id", ondelete='CASCADE'), nullable=False)

各自的模式是:

from flask_marshmallow import Marshmallow

ma = Marshmallow()

class UserSchema(ma.ModelSchema):
    id = ma.Int(dump_only=True)
    roles = ma.Nested(RoleSchema(only=("role_name",)))

    class Meta:
        model = User
        sqla_session = db.session

class RoleSchema(ma.ModelSchema):

    id = ma.Int(dump_only=True)

    class Meta:
        model = Role
        sqla_session = db.session

class UserRoleSchema(ma.ModelSchema):
    id = ma.Int(dump_only=True)

    class Meta:
        model = UserRoles
        sqla_session = db.session
        include_fk = True

当我尝试执行时,出现以下棉花糖验证错误:

{'roles': {'_schema': ['输入类型无效。']}}

我理解该消息,但由于缺乏知识,我找不到解决方案。非常感谢任何帮助。

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