well I cant run the program since its not complete (no Drug, Supplier
class/tables defined, etc), but if id hazard a guess id say you
shouldnt be calling "flush()" on your class instances, since it will
not flush any changes on any dependencies. call ctx.current.flush()
instead.
On Feb 20, 2007, at 1:40 PM, Ali wrote:
>
> Ok,
>
> from sqlalchemy import *
>
>
> from sqlalchemy.ext.assignmapper import assign_mapper
> from sqlalchemy.ext.sessioncontext import SessionContext
>
> meta = DynamicMetaData()
>
> ctx = SessionContext(create_session)
>
> def make_engine(uri=None):
> if uri is None:
> uri = 'sqlite:///:memory:'
> engine = create_engine(uri, echo=True)
> return engine
>
> def connect(uri=None):
> meta.connect(make_engine(uri=uri))
>
>
> users_table = Table('user', meta,
> Column('id', Integer, autoincrement=True, primary_key=True),
> Column('name', String),
> Column('password', String),
> Column('registration', String),
> )
>
> class User(object):
> """User"""
> def get_is_admin(self):
> return self.id == 1
> is_admin = property(get_is_admin)
>
> def __str__(self):
> s = self.name
> if self.registration:
> s = '%s (%s)' % (s, self.registration)
> return s
>
> assign_mapper(ctx, User, users_table)
>
> stockreceipt_table = Table('stockreceipt', meta,
> Column('id', Integer, autoincrement=True, primary_key=True),
> Column('drug_id', Integer, ForeignKey('drug.id')),
> Column('date', Date),
> Column('quantity', Integer),
> Column('supplier_id', Integer, ForeignKey('supplier.id')),
> Column('user_id', Integer, ForeignKey('user.id')),
> Column('cancelled', Boolean),
> Column('cancelled_reason', String),
> Column('cancelled_user_id', Integer, ForeignKey('user.id')),
> Column('internal_transfer', Boolean),
> Column('invoice_number', String),
> Column('internal_from', String),
> )
>
> class Receipt(object):
> """Stock Receipt"""
> def get_cancelled_user_hack(self):
> return User.get_by(id=self.cancelled_user_id)
> cancelled_user_hack = property(get_cancelled_user_hack)
>
> assign_mapper(ctx, Receipt, stockreceipt_table,
> properties=dict(
> user=relation(User, backref='receipts',
> primaryjoin=stockreceipt_table.c.user_id ==
> users_table.c.id),
> cancelled_user=relation(User, backref='cancelled_receipts',
> lazy=False,
> primaryjoin=stockreceipt_table.c.cancelled_user_id ==
> users_table.c.id),
> supplier=relation(Supplier, backref='receipts'),
> drug=relation(Drug, backref='receipts'),
> )
> )
>
> meta.create_all()
> connect()
>
>>>> u = User(name='Ali')
>>>> u.flush()
>>>> r = Receipt(user_id=u.id)
>>>> r.flush()
>>>> r.user is u
> True
>>>> r.cancelled_user_id = u.id
>>>> r.flush()
>>>> r.cancelled_user is u
> True
>
> Now, as I mentioned, r.cancelled_user is set correctly in this
> example, but not (always) in my application, although it is used
> similarly. (I am happy to paste 2000 lines of PyGTK if you like). When
> the attribute is accessed, there is no SQL output at all, although in
> this example there is.
>
> Thanks for any assistance,
>
> Ali
>
>
> On Feb 20, 6:04 pm, "Michael Bayer" <[EMAIL PROTECTED]> wrote:
>> why dont you attach a script that runs completely ? use a
>> "sqlite://"
>> database.
>>
>> On Feb 20, 12:14 pm, "Ali" <[EMAIL PROTECTED]> wrote:
>>
>>> By "both", I mean user and receipt tables
>>
>>> On 20 Feb, 17:12, "Ali" <[EMAIL PROTECTED]> wrote:
>>
>>>> I left out the fields for brevity of example. They both have an id
>>>> column defined as primary keys.
>>
>>>> On 20 Feb, 17:11, "Michael Bayer" <[EMAIL PROTECTED]> wrote:
>>
>>>>> On Feb 20, 12:01 pm, "Ali" <[EMAIL PROTECTED]> wrote:
>>
>>>>>> Here is my code (with other fields removed):
>>
>>>>>> stockreceipt_table = Table('stockreceipt', meta,
>>>>>> Column('user_id', Integer, ForeignKey('user.id')),
>>>>>> # Cancellation
>>>>>> Column('cancelled_user_id', Integer, ForeignKey('user.id')),
>>>>>> )
>>
>>>>>> class Receipt(object):
>>>>>> """Stock Receipt"""
>>
>>>>>> assign_mapper(ctx, Receipt, stockreceipt_table,
>>>>>> properties=dict(
>>>>>> user=relation(User, backref='receipts',
>>>>>> primaryjoin=stockreceipt_table.c.user_id ==
>>>>>> users_table.c.id),
>>>>>> cancelled_user=relation(User,
>>>>>> backref='cancelled_receipts',
>>>>>> lazy=False,
>>>>>> primaryjoin=stockreceipt_table.c.cancelled_user_id ==
>>>>>> users_table.c.id),
>>>>>> )
>>
>>>>> that cant be right, since theres no primary key expressed
>>>>> either in
>>>>> the stockreceipt_table or in your Receipt mapper.
>
>
> >
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