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 -- Simplistix - Content Management, Zope & Python Consulting - http://www.simplistix.co.uk --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---