On 03/10/2013 11:42, Werner wrote:
Hi,
I have a problem that when I add a record to 'cellarbook' using the
following code the 'old' cellarbook entry is dropped from the db.
oldCB = session.query(db.Cellarbook).get(7)
newCB = db.Cellarbook()
# set some data from existing dbitem
newCB.cellar = oldCB.cellar
newCB.authuser = oldCB.authuser
newCB.supplier = oldCB.supplier
newCB.vintage = oldCB.vintage
newBot = db.Bottle()
newCB.vintage.bottle.append(newBot)
newCB.bottle = newBot
newCB.drinkinfo = oldCB.drinkinfo
session.add(newCB)
session.commit()
After this I have newCB.id=10 in the database but oldCB.id=7 has gone.
I guess/think that I have a relation setup incorrectly which creates
this effect, but I can not put my finger on it.
Appreciate any hint.
Werner
The relation setup for the classes involved, and I suspect
Vintage.drinkinfo/Cellarbook.drinkinfo ones:
Vintage.vintadd = sao.relationship('Vintadd', uselist=False,
cascade="all, delete, delete-orphan",
single_parent=True)
Vintage.cellarbook = sao.relationship('Cellarbook', uselist=False,
cascade="all, delete,
delete-orphan",
backref='vintage')
Vintage.drinkinfo = sao.relationship('Drinkinfo', backref='vintage',
cascade="all, delete,
delete-orphan",
single_parent=True)
Bottle.cellarbook = sao.relationship('Cellarbook', uselist=False,
#cascade="all, delete,
delete-orphan",
backref='bottle')
Bottle.vintage = sao.relationship('Vintage', backref='bottle',
#cascade="all, delete, delete-orphan",
single_parent=True)
Cellarbook.supplier = sao.relationship('Profilec',
primaryjoin=('Cellarbook.fk_supplier_id==Profilec.id'),
viewonly=True)
Cellarbook.cellar = sao.relationship('Cellar', backref='cellarbook')
Cellarbook.authuser = sao.relationship('Authuser')
Cellarbook.drinkinfo = sao.relationship('Drinkinfo',
backref='cellarbook',
single_parent=True)
Cellarbook.purchase = sao.relationship('Purchase', backref='cellarbook',
cascade="all, delete,
delete-orphan")
Purchase.cellar = sao.relationship('Cellar')
Purchase.currency = sao.relationship('Currency')
Purchase.supplier = sao.relationship('Profilec',
primaryjoin=('Purchase.fk_supplier_id==Profilec.id'),
viewonly=True)
If I create a new 'vintage' record then it works (see code below), but
that is another use case and I really would like to support both of them.
Werner
newCB = db.Cellarbook()
# set some data from existing dbitem
newCB.cellar = oldCB.cellar
newCB.authuser = oldCB.authuser
newCB.supplier = oldCB.supplier
newCB.drinkinfo = oldCB.drinkinfo
## use existing vintage
#newCB.vintage = oldCB.vintage
# create a new vintage
dbVintage = db.Vintage()
dbVintage.vintage = 2025
dbVintAdd = db.Vintadd()
dbVintage.vintadd = dbVintAdd
dbVintage.drinkinfo = newCB.drinkinfo
newCB.vintage = dbVintage
# create a bottle
newBot = db.Bottle()
newCB.vintage.bottle.append(newBot)
newCB.bottle = newBot
session.add(newCB)
session.flush()
session.commit()
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