models.py

from __future__ import absolute_import

import enum

from sqlalchemy import Column, Date, Enum, ForeignKey, Integer, String, Table
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import mapper, relationship

Base = declarative_base()

association_table = Table('association', Base.metadata,
                          Column('pet_id', Integer, ForeignKey('pets.id')),
                          Column('reporter_id', Integer, ForeignKey('reporters.id')))


class Editor(Base):
    __tablename__ = 'editors'
    editor_id = Column(Integer(), primary_key=True)
    name = Column(String(100))


class Pet(Base):
    __tablename__ = 'pets'
    id = Column(Integer(), primary_key=True)
    name = Column(String(30))
    pet_kind = Column(Enum('cat', 'dog', name='pet_kind'), nullable=False)
    reporter_id = Column(Integer(), ForeignKey('reporters.id'))


class Reporter(Base):
    __tablename__ = 'reporters'
    id = Column(Integer(), primary_key=True)
    first_name = Column(String(30))
    last_name = Column(String(30))
    email = Column(String())
    pets = relationship('Pet', secondary=association_table, backref='reporters')
    articles = relationship('Article', backref='reporter')
    favorite_article = relationship("Article", uselist=False)

    # total = column_property(
    #     select([
    #         func.cast(func.count(PersonInfo.id), Float)
    #     ])
    # )


class Article(Base):
    __tablename__ = 'articles'
    id = Column(Integer(), primary_key=True)
    headline = Column(String(100))
    pub_date = Column(Date())
    reporter_id = Column(Integer(), ForeignKey('reporters.id'))


class ReflectedEditor(type):
    """Same as Editor, but using reflected table."""
    @classmethod
    def __subclasses__(cls):
        return []

editor_table = Table('editors', Base.metadata, autoload=True)

mapper(ReflectedEditor, editor_table)