database_setup.py

#Import modules
from sqlalchemy import Column, Integer, String, ForeignKey, DateTime
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship
from sqlalchemy import create_engine
import datetime

#Instance of Declarative Base
Base = declarative_base()

#Create Class User
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)

    #We added this serialize function to be able to send JSON objects in a serializable format
    @property
    def serialize(self):
        return {
            'name': self.name,
            'id': self.id,

        }

#Create Class Category
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)
    items = relationship("Item", cascade="all, delete-orphan")

    #We added this serialize function to be able to send JSON objects in a serializable format
    @property
    def serialize(self):
        return {
            'name': self.name,
            'id': self.id,
            'user_id': self.user_id
        }

#Create Class Item
class Item(Base):
    __tablename__ = 'item'

    id = Column(Integer, primary_key=True)
    name = Column(String(250), nullable=False)
    description = Column(String)
    image = Column(String)
    createdDate = Column(DateTime, default=datetime.datetime.utcnow, nullable=False)
    category_id = Column(Integer, ForeignKey('category.id'))
    category = relationship(Category)
    user_id = Column(Integer, ForeignKey('user.id'))
    user = relationship(User)

    #We added this serialize function to be able to send JSON objects in a serializable format
    @property
    def serialize(self):
        return {
            'name': self.name,
            'id': self.id,
            'description': self.description,
            'user_id': self.user_id
        }

#Create Engine and Connect to the Database
engine = create_engine('sqlite:///catalog_database.db')
Base.metadata.create_all(engine)