Hi,
I'm using polymorphism for some of my models and I'm wondering how I
should use the with_polymorphic query method.
Consider the following:
class A(Base):
type_ = Column(Integer, nullable=False)
arg = Column(String(20))
__mapper_args__ = {'polymorphic_on': type_,
the company I worked for has decided to change a RDBMS behind our ERP.
The side effect of this is that the columns will no longer be prefixed
with *t$*
but with* t_* instead. I do not want to change all the occurences of
column
names in my code. I should also mention, that I use only
Hello.
I was unable to reproduce the problem on your test example. I THINK it does
exactly what my problematic code does. It seems that either the problem is more
elaborate (but I don't see it) or I have a bug somewhere in my code. However my
simple workaround works, so I consider the problem
Thanks, I will stick to the default as it is not causing too much trouble.
One more thing I have been noticing in the last couple of days is that a
row I'm querying in the database using filter_by() on three predicates and
limited by first() is being returned as None. I turned on mysql query
I have a base class which has two subclasses specified via a polymorphic
discriminator, and I'm wondering how to set things up so the returned
results are instances of the subclass, when I create an instance of the
base class and assign the relevant value to the discriminator column.
Here's my
On Nov 13, 2012, at 5:18 AM, Petr Blahos wrote:
I have been unlucky with mssql, where the first part - the table definition
and making queries worked, but not accessing data in RowProxy using the
key. I guess there is a bug in dialects/mssql/base.py
in MSSQLCompiler.visit_column:
On Nov 13, 2012, at 12:28 PM, ckv wrote:
Thanks, I will stick to the default as it is not causing too much trouble.
One more thing I have been noticing in the last couple of days is that a row
I'm querying in the database using filter_by() on three predicates and
limited by first() is
On Nov 13, 2012, at 7:59 PM, Gerald Thibault wrote:
I have a base class which has two subclasses specified via a polymorphic
discriminator, and I'm wondering how to set things up so the returned results
are instances of the subclass, when I create an instance of the base class
and assign
On Nov 13, 2012, at 11:03 PM, Bobby Impollonia wrote:
I have constructed a sample program consisting of two mapped classes (using
sqlalchemy.ext.declarative) that have a relationship/ backref between them.
At runtime the program does the following:
1) Print whether the parent class has an
On Nov 13, 2012, at 3:34 AM, tonthon wrote:
Hi,
I'm using polymorphism for some of my models and I'm wondering how I
should use the with_polymorphic query method.
Consider the following:
class A(Base):
type_ = Column(Integer, nullable=False)
arg = Column(String(20))
On Nov 12, 2012, at 9:37 PM, Michael Bayer wrote:
On Nov 12, 2012, at 5:33 PM, Torsten Landschoff wrote:
BTW, I found one offender that breaks running database upgrades with my
locking schemes:
from sqlalchemy import *
from sqlalchemy.pool import *
engine =
Thank you! That is exactly the function I needed.
On Tuesday, November 13, 2012 9:16:47 PM UTC-8, Michael Bayer wrote:
On Nov 13, 2012, at 11:03 PM, Bobby Impollonia wrote:
I have constructed a sample program consisting of two mapped classes
(using sqlalchemy.ext.declarative) that have a
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