database_setup.py

#!/usr/bin/env python
from sqlalchemy import Column, ForeignKey, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker


Base = declarative_base()


# Class definition
class User(Base):
    # Table info
    __tablename__ = 'user'

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


# Class definition
class Category(Base):
    # Table info
    __tablename__ = 'category'
    # Mapper info
    id = Column(Integer, primary_key=True)
    name = Column(String(80), nullable=False)
    description = Column(String(300))

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


# Class definition
class Item(Base):
    # Table info
    __tablename__ = 'item'

    id = Column(Integer, primary_key=True)
    name = Column(String(80), nullable=False)
    description = Column(String(300))
    category_id = Column(Integer, ForeignKey('category.id'), nullable=False)
    user_id = Column(Integer, ForeignKey('user.id'), nullable=False)
    user = relationship(User)
    category = relationship(Category)

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


engine = create_engine('sqlite:///catalog.db')
Base.metadata.create_all(engine)


Base.metadata.bind = engine

DBSession = sessionmaker(bind=engine)
session = DBSession()