Hi All,
Can someone tell me why this script:
from datetime import datetime
from sqlalchemy import create_engine, Table, Column, Integer, String,
DateTime, ForeignKey
from sqlalchemy.orm import sessionmaker, relation, backref
from sqlalchemy.ext.declarative import declarative_base
engine = create_engine('sqlite://')
Base = declarative_base(engine=engine)
class Unit(Base):
__tablename__ = 'units'
id = Column(Integer,primary_key=True)
name = Column(String)
class Record(Base):
__tablename__ = 'records'
timestamp = Column(DateTime,primary_key=True)
unit_id = Column(Integer,ForeignKey('units.id'),primary_key=True)
unit = relation('Unit',
backref=backref('records',order_by=timestamp))
Base.metadata.create_all()
session = sessionmaker(bind=engine)()
unit = Unit(id=1,name='unit 1')
session.merge(unit)
session.add(Record(
timestamp = datetime.now(),
unit = unit,
))
session.merge(Unit(id=2,name='unit 2'))
...barfs on the second session.merge with an eexception that ends as
follows:
sqlalchemy.exc.IntegrityError: (IntegrityError) PRIMARY KEY must be
unique u'INSERT INTO units (id, name) VALUES (?, ?)' [1, 'unit 1']
cheers,
Chris
--
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- http://www.simplistix.co.uk
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