小编Shi*_*iva的帖子

令人困惑的PostgreSql,在某些地方人们告诉它是noSql,在某些地方人们告诉它不是noSql.看到PostgreSql加上哪些是实际的noSql.建议我到底是什么？

提前致谢.

是python的新手，是USign 棉花糖序列化。无法使用嵌套的scehma。，我的代码

from sqlalchemy import Column, Float, Integer, String, Text, text,ForeignKey
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship

Base = declarative_base()
metadata = Base.metadata




class CompanyDemo(Base):
    __tablename__ = 'company_demo'

    company_id = Column(Integer, primary_key=True,                                                     
    server_default=text("nextval('company_demo_company_id_seq'::regclass)"))
    name = Column(Text, nullable=False)
    address = Column(String(50))
    location = Column(String(50))


 class UsersDemo(Base):
    __tablename__ = 'users_demo'

    id = Column(Integer, primary_key=True,                                                                                                                    
    server_default=text("nextval('users_demo_id_seq'::regclass)"))
    company_id = Column(Integer,ForeignKey('company_demo.company_id'), nullable=False)
    email = Column(String)

company = relationship('CompanyDemo')

图式

    from marshmallow import Schema, fields, pprint


    class CompanySchema(Schema):
        company_id = fields.Int(dump_only=True)
        name = …