models.py

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

convention = {
    "fk": "fk_%(table_name)s_%(column_0_name)s_%(referred_table_name)s",
}
metadata = MetaData(naming_convention=convention)

Base = declarative_base(metadata=metadata)

class Company(Base):
    __tablename__ = 'companies'

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

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

class Dev(Base):
    __tablename__ = 'devs'

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

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



class Freebie(Base):
    __tablename__ = "freebies"

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

    dev = relationship("Dev", "freebies")
    company = relationship("Company", "freebies")

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