catalog_db_setup.py

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

Base = declarative_base()

# User table will hold our application users so that
# we can keep track of what category/subcategory belongs to whom
class User(Base):
    __tablename__ = 'user'

    id = Column(Integer, primary_key=True)
    name = Column(String(250), nullable=False)
    email = Column(String(250), nullable=False)
    picture = Column(String(250))

# The Category table will hold the categories for the catalog app
class Category(Base):
    __tablename__ = 'category'

    id = Column(Integer, primary_key=True)
    name = Column(String(250), nullable=False)
    user_id = Column(Integer, ForeignKey('user.id'))
    user = relationship(User)

    @property
    def serialize(self):
        """Return object data in easily serializeable format"""
        return {
            'name': self.name,
            'id': self.id,
        }

# The Subcategory table will hold the subcategories belonging to the
# parent categories
class Subcategory(Base):
    __tablename__ = 'subcategory'

    name = Column(String(80), nullable=False)
    id = Column(Integer, primary_key=True)
    description = Column(String(250))
    category_id = Column(Integer, ForeignKey('category.id'))
    category = relationship(Category, backref=backref("Subcategory", cascade="all,delete"))
    user_id = Column(Integer, ForeignKey('user.id'))
    user = relationship(User)

    @property
    def serialize(self):
        """Return object data in easily serializeable format"""
        return {
            'name': self.name,
            'description': self.description,
            'id': self.id,
        }


engine = create_engine('sqlite:///catalogwithusers.db')


Base.metadata.create_all(engine)