db_setup.py

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


Base = declarative_base()


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))

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 {
        'id': self.id,
        'name': self.name,
        'user_id': self.user_id
        }


class Item(Base):
    __tablename__ = 'item'

    id = Column(Integer, primary_key=True)
    name = Column(String(80), nullable=False)
    description = Column(String(250))
    price = Column(String(8))
    date_added = Column(DateTime)
    category_id = Column(Integer, ForeignKey('category.id'))
    category = relationship(Category)
    user_id = Column(Integer, ForeignKey('user.id'))
    user = relationship(User)

    @property
    def serialize(self):
        return {
        'id': self.id,
        'name': self.name,
        'description': self.description,
        'price': self.price,
        'date_added': self.date_added,
        'category_id': self.category_id
        }


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

Base.metadata.create_all(engine)