I've met so few other Farrells, maybe we ARE related!! Get it, related, in a SqlAlchemy group. Oh man I'm such a geek!!
> -----Original Message----- > From: sqlalchemy@googlegroups.com [mailto:[EMAIL PROTECTED] > On Behalf Of Bob > Sent: Tuesday, December 02, 2008 9:00 AM > To: sqlalchemy@googlegroups.com > Subject: [sqlalchemy] Re: New instance ExtraStat with identity key > (...) conflicts with persistent instance ExtraStat > > > I keep thinking one of my relatives has emailed me when you post here > and I get all excited. Any chance you can change your name ? :-) > > 2008/12/2 Doug Farrell <[EMAIL PROTECTED]>: > > Michael, > > > > > > > > Thanks for the pointer, that makes great sense, and once again points > how my > > generally small database design skills. I'll update my code to try > this out. > > > > > > > > Again, > > > > Thanks! > > > > Doug > > > > > > > > From: sqlalchemy@googlegroups.com > [mailto:[EMAIL PROTECTED] On > > Behalf Of Michael Bayer > > Sent: Saturday, November 29, 2008 9:28 PM > > To: sqlalchemy@googlegroups.com > > Subject: [sqlalchemy] Re: New instance ExtraStat with identity key > (...) > > conflicts with persistent instance ExtraStat > > > > > > > > Simon's suggestion about the duplicate "name" still holds. Your > relation > > from Stat->ExtraStat currently needs to be one-to-one since you > cannot have > > more than one ExtraStat referencing a single Stat, due to the PK > constraint > > on ExtraStat.name. The error is raising at the point of query() > since > > autoflush is kicking in - use session.flush() to isolate the error. > > > > > > > > On Nov 29, 2008, at 12:18 PM, Doug Farrell wrote: > > > > Hi all, > > > > > > > > I'm having a problem with a new instance of a relation conflicting > with > > > > an existing instance. I'm using SA 0.5rc with Sqlite3. Here are my > > > > simplified classes: > > > > > > > > class Stat(sqladb.Base): > > > > __tablename__ = "stats" > > > > name = Column(String(32), primary_key=True) > > > > total = Column(Integer) > > > > created = Column(DateTime, default=datetime.datetime.now()) > > > > updated = Column(DateTime) > > > > states = Column(PickleType, default={}) > > > > extraStats = relation("ExtraStat", backref="stat") > > > > > > > > class ExtraStat(sqladb.Base): > > > > __tablename__ = "extrastats" > > > > name = Column(String(32), ForeignKey("stats.name"), > > primary_key=True) > > > > total = Column(Integer) > > > > created = Column(DateTime, default=datetime.datetime.now()) > > > > updated = Column(DateTime) > > > > states = Column(PickleType, default={}) > > > > > > > > The above Stat class has a one-to-many relationship with the > ExtraStat > > > > class (which I think I've implemented correctly). Later in the > > > > program I create an in memory data model that has as part of it's > > > > components two > > > > dictionaries that contain Stat instances. Those Stat instances have > > > > relationships to ExtraStat instances. My problem comes in the > > > > following when I'm trying to update the data in those > instances/tables. > > > > Here is a section of code that throws the exception: > > > > > > > > > > > > > > > > pressName = "press%s" % pressNum > > > > # add new ExtraStat instances as relations > > > > self._addProductStatsPress(productType, pressName) > > > > self._addPressStatsProduct(pressName, productType) > > > > try: > > > > extraStat = session.query(Stat). \ > > > > filter(Stat.name==productType). \ > > > > join("extraStats"). \ > > > > filter(ExtraStat.name==pressName).one() > > > > except: > > > > extraStat = ExtraStat(pressName, ExtraStat.PRESS_TYPE) > > > > self.productStats[productType].extraStats.append(extraStat) > > > > extraStat.states.setdefault(sstate, 0) > > > > extraStat.states[sstate] += 1 > > > > extraStat.updated = now > > > > extraStat = session.merge(extraStat) > > > > try: > > > > extraStat = session.query(Stat). \ > > > > filter(Stat.name==pressName). \ > > > > join("extraStats"). \ > > > > filter(ExtraStat.name==productType).one() <==== > throws > > exception right here > > > > except: > > > > extraStat = ExtraStat(productType, ExtraStat.PRODUCT_TYPE) > > > > self.pressStats[pressName].extraStats.append(extraStat) > > > > extraStat.states.setdefault(sstate, 0) > > > > extraStat.states[sstate] += 1 > > > > extraStat.updated = now > > > > > > > > The marked area is wear it throws the exception. I'm not sure what to > > > > do here to get past this, any help or ideas would be greatly > > > > appreciated. > > > > > > > > The exact exception is as follows: > > > > Sqlalchemy.orm.exc.FlushError: New instance [EMAIL PROTECTED] With > identity > > > > key (<class '__main__.ExtraStat'>,(u'C',)) conflicts with persistent > > > > instance [EMAIL PROTECTED] > > > > > > > > Thanks! > > > > Doug > > > > > > > > > > > > > > > > > > > r more options, visit this group at > http://groups.google.com/group/sqlalchemy?hl=en > -~----------~----~----~----~------~----~------~--~--- --~--~---------~--~----~------------~-------~--~----~ 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 [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
