Found two ways of doing this:
1. use metaclass:
from sqlalchemy.ext.declarative import DeclarativeMeta
class PolymorphicSetter(DeclarativeMeta):
def __new__(cls, name, bases, dictionary):
if '__mapper_args__' in dictionary.keys():
dictionary['__mapper_args__']['polymorph
here is the sample code I am using
http://pastebin.com/m6cd9c5dd
--
Mike Conley
On Wed, Sep 9, 2009 at 11:10 PM, Mike Conley wrote:
> On Wed, Sep 9, 2009 at 10:46 PM, Michael Bayer
> wrote:
>
>>
>>
>> On Sep 9, 2009, at 8:41 PM, Seth wrote:
>>
>> >
>> > Ok Mike,
>> >
>> > Tell me what yo
On Wed, Sep 9, 2009 at 10:46 PM, Michael Bayer wrote:
>
>
> On Sep 9, 2009, at 8:41 PM, Seth wrote:
>
> >
> > Ok Mike,
> >
> > Tell me what you think about this:
> >
> > q1 = DBSession.query(P1.id, P1.user_id, P1.type, P1.title, P1.body,
> > P1.created, P1.updated)
> > q2 = DBSession.query(P2.id,
Thanks for the suggestion Wolodja but I dont think that would work.
The self object is not defined at the time of class loading in python:
>>> class Test:
... qq = self.__class__.__name__
... def fu(self):
... print "fu"
...
Traceback (most recent call last):
File "", line 1
On Sep 9, 2009, at 8:41 PM, Seth wrote:
>
> Ok Mike,
>
> Tell me what you think about this:
>
> q1 = DBSession.query(P1.id, P1.user_id, P1.type, P1.title, P1.body,
> P1.created, P1.updated)
> q2 = DBSession.query(P2.id, P2.user_id, "'P2'", P2.title, P2.body,
> P2.created, P2.updated)
> q3 = DBSe
Nothing hackish about it. The SQL is doing exactly what you want; union the
posting tables and join the result to users. Simple enough that the database
engine should construct a reasonable plan.
--
Mike Conley
On Wed, Sep 9, 2009 at 8:41 PM, Seth wrote:
>
> Ok Mike,
>
> Tell me what you thi
Ok Mike,
Tell me what you think about this:
q1 = DBSession.query(P1.id, P1.user_id, P1.type, P1.title, P1.body,
P1.created, P1.updated)
q2 = DBSession.query(P2.id, P2.user_id, "'P2'", P2.title, P2.body,
P2.created, P2.updated)
q3 = DBSession.query(P3.id, P3.user_id, "'P3'", P3.title, P3.body,
P3
Mike,
That's the magic I was looking for! Thank you for a more thorough
explanation of the subject at hand.
If the length of this thread is anyone's "fault", it would be mine for
being somewhat of a SQLAlchemy newbie. I am extremely grateful for
your willingness to see this thread through and I
Seth wrote:
>
> Michael,
>
> I'm really baffled by your response. Are we reading two different
> threads here? Or, perhaps you missed the main message in this thread
> outlining the issues with the suggestions you've given me so far?
hi Seth -
I was responding specifically to your example:
use
Michael,
I'm really baffled by your response. Are we reading two different
threads here? Or, perhaps you missed the main message in this thread
outlining the issues with the suggestions you've given me so far?
( direct link here:
http://groups.google.com/group/sqlalchemy/msg/d4d7a958f8ac2ff8
)
Seth wrote:
>
> Michael,
>
> This is not valid SQL being outputted (at least on SQLite & MySQL).
> There should not be a parenthesis between the first UNION and SELECT.
> This causes an SQL error.
>
> Is there a way to reformat the query to get valid SQL?
the results you posted do not have any pa
On Wed, Sep 09, 2009 at 10:14 -0700, gizli wrote:
> This list has been very helpful so far, thanks a lot. I was just
> wondering if there is a transparent way to assign polymorphic
> identities to ORM classes using single table inheritance. Let's say we
> have a base Task class:
>
> class Task(De
Michael,
This is not valid SQL being outputted (at least on SQLite & MySQL).
There should not be a parenthesis between the first UNION and SELECT.
This causes an SQL error.
Is there a way to reformat the query to get valid SQL?
Thanks,
Seth
On Sep 9, 8:38 am, "Michael Bayer" wrote:
> Seth wr
Hi all,
This list has been very helpful so far, thanks a lot. I was just
wondering if there is a transparent way to assign polymorphic
identities to ORM classes using single table inheritance. Let's say we
have a base Task class:
class Task(DeclarativeBase):
__tablename__ = 'Tasks'
id = C
Seth wrote:
>
> Michael,
>
> Once again I appreciate your help on this issue; and once again I
> cannot seem to find the right recipe to get SQLAlchemy to format the
> query like I want.
>
> I tried your latest suggestion:
>
users = DBSession.query(Post.id.label('post_id'),
Post.user_id.
Thanks much! I couldn't find where that module is buried inside the
documentation, hence my question.
Best Regards,
Dan Presley
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> [mailto:sqlalch...@googlegroups.com] On Behalf Of Eloff
> Sent: 08 September 2009 21:34
> To: sqlalchemy
> Subject: [sqlalchemy] Re: How to bypass scoped_session?
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>
> On Sep 8, 3:47 am, "King Simon-NFHD78"
> wrote:
> > Automa
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