models.py

from sqlalchemy import ForeignKey, Column, Integer, String, MetaData
from sqlalchemy import ForeignKey, Column, Integer, String, MetaData, Table
from sqlalchemy.orm import relationship, backref
from sqlalchemy.ext.declarative import declarative_base

metadata= MetaData()
Base = declarative_base(metadata=metadata)

company_dev = Table(
    'company_dev',
    Base.metadata,
    Column('company_id', ForeignKey('companies.id'), primary_key=True),
    Column('dev_id', ForeignKey('devs.id'), primary_key=True)
)

class Company(Base):
    __tablename__ = 'companies'

    id = Column(Integer(), primary_key=True)
    name = Column(String())
    founding_year = Column(Integer())

    freebies = relationship('Freebie', backref='company')
    freebies = relationship('Freebie', back_populates='company')
    devs = relationship('Dev', secondary='company_dev', back_populates='companies')

    def __repr__(self):
        return f'<Company {self.name}>'
    

    def give_freebie(self, dev, item_name, value):
        freebie = Freebie (
            item_name = item_name,
        freebie = Freebie(
            item_name=item_name,
            value=value,
            company_id=self.id,
            dev_id=dev.id
        ) )
        return freebie
    

    @classmethod
    def oldest_company(cls, session):
        return session.query(cls).order_by(cls.founding_year).first()


class Dev(Base):
    __tablename__ = 'devs'

    id = Column(Integer(), primary_key=True)
    name= Column(String())
    name = Column(String())

    freebies = relationship('Freebie', backref='dev')
    freebies = relationship('Freebie', back_populates='dev')
    companies = relationship('Company', secondary='company_dev', back_populates='devs')

    def __repr__(self):
        return f'<Dev {self.name}>'
    

    def received_one(self, item_name):
        return any(freebie.item_name == item_name for freebie in self.freebies)
    

    def give_away(self, other_dev, freebie):
        if freebie.dev_id == self.id:
            freebie.dev_id == other_dev.id
            freebie.dev_id = other_dev.id

class Freebie(Base):
    __tablename__='freebies'
    __tablename__ = 'freebies'

    id = Column(Integer, primary_key=True)
    item_name = Column(String)
    value = Column(Integer)
    company_id = Column(Integer, ForeignKey('companies.id'))
    dev_id = Column(Integer, ForeignKey('devs.id'))

    # company = relationship('Company', backref='freebies')
    # dev = relationship('Dev', backref='freebies')
    company = relationship('Company', back_populates='freebies')
    dev = relationship('Dev', back_populates='freebies')

    def printer(self):
        return f'{self.dev.name} owns a {self.item_name} from {self.company.name}'