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database_setup.py
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83 lines (68 loc) · 2.7 KB
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#
#
# database_setup.py -- to create the database for the Catalog Project
#
# Many thanks to the people at Udacity
# and of course the Full Stack Foundations - Lesson 4 examples
import os
import sys
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 import UniqueConstraint
Base = declarative_base()
# The table name 'user' is populated from the Google or Facebook log ins
# The user id is linked to the category and item tables to determine who
# created those entries and who can subsequently amend.
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 table name 'category' is the top end of our application.
# One category can have many items linked to it. For example a library category has many books.
# The table is linked to the 'user' table to determine who created the category.
# The table has a one to many relationship with the 'item' table.
class Category(Base):
__tablename__ = 'category'
id = Column(Integer, primary_key=True)
name = Column(String(250), nullable=False, unique=True)
picture = Column(String(250))
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,
'picture': self.picture,
}
# The table name 'item' is the bottom end of our application.
# One item can only be linked to one category. For example a library book can only be in one library at a time.
# Noting that one category can have many items.
# The table is linked to the 'user' table to determine who created the item.
class Item(Base):
__tablename__ = 'item'
id = Column(Integer, primary_key=True)
name = Column(String(80), nullable=False)
description = Column(String(250))
picture = Column(String(250))
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 object data in easily serializeable format"""
return {
'name': self.name,
'description': self.description,
'id': self.id,
'picture': self.picture,
}
print "Database setup has completed"
engine = create_engine('sqlite:///catalog.db')
Base.metadata.create_all(engine)