Hello,
I am experimenting with a pattern where records hold the table name
and record id of the next record in any other table, chaining records
in different tables. This works, but I can't figure out how to clean
op references to the next record in another table when I delete a
record (the
/docs/orm/tutorial.html#adding-new-objectsyou will
see that this interaction is described.
You can of course set .id to any value you'd like and that will be the value
used when the flush happens.
On Apr 3, 2011, at 1:09 PM, farcat wrote:
Hi all,
I use a kind of dynamic reference
in dynamic other tables.)
Hope this helps someone in the future; the error messages can be very
confusing.
On Apr 2, 2:59 pm, farcat gemer...@gmail.com wrote:
Hello,
I get the following error:
___
Traceback (most recent call last):
File D:\Documents\Code\Eclipse
Hi all,
I use a kind of dynamic reference from parent_table to other tables.
For that parent_table uses columns table_name and a record_id. This
makes it possible to have a reference from parent_table to any record
in any table in the database. However, say that i want to reference a
record of
, farcat wrote:
The problem seemed to be in the order of adding relationships. The
main difference is that now i call DeclarativeMeta.__init__ before
adding relationships. Even using a dict with relationship attributes
as last argument to __init__ did not work.( BTW cls.links is a table
He Michael,
You saved me again .. Thanks!
On Apr 2, 2:09 am, Michael Bayer mike...@zzzcomputing.com wrote:
On Apr 1, 2011, at 2:52 PM, farcat wrote:
Hi Michael,
Still stuck, I don't mixin foreign keys or relationships. When is a
Column attached to a table in declarative?
so you have
or related class/table F_Address.
Please help ... It might be related to the ForeignKey in the code I
showed earlier in this thread, but I don't see how.
On Apr 2, 11:56 am, farcat gemer...@gmail.com wrote:
He Michael,
You saved me again .. Thanks!
On Apr 2, 2:09 am, Michael Bayer mike
help
The typedefs variables describe classes and members, and are queried
from normal tables
On Mar 31, 5:33 pm, Michael Bayer mike...@zzzcomputing.com wrote:
On Mar 31, 2011, at 11:29 AM, farcat wrote:
Hi,
I am getting the following error after creating a number of classes
Hi,
I am getting the following error after creating a number of classes
through metaclasses:
Traceback (most recent call last):
File D:\Documents\Code\Eclipse\workspace\SQLAtest\data.py, line
20, in module
createClasses(engine, session)
File
Hi all,
I am stuck on an integrity error. The code worked before, but i cannot
figure out what changed so it does not anymore. It is possibly a dumn
oversight.
The code is:
from sqlalchemy import *
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import
I don't know whether to laugh or cry ... thanks
On Mar 28, 6:25 pm, Michael Bayer mike...@zzzcomputing.com wrote:
your enum is set for uni, list, set and you're passing in one
On Mar 28, 2011, at 6:35 AM, farcat wrote:
Hi all,
I am stuck on an integrity error. The code worked
:27, farcat wrote:
OK, dumb error, move Base.metadata.create_all(engine) below table1 =
tablemeta(table1) and it works.
This works when I create the columns via the temp dict in __new__ not
when I do so in __init__ (it complains about missing __tabledata__),
but why?
I'd strongly
, Chris Withers ch...@simplistix.co.uk wrote:
On 16/03/2011 21:01, farcat wrote:
I have an error i cant figure out (likely a beginners error):
Beginners should not be using metaclasses.
What's your use case here?
Chris
--
Simplistix - Content Management, Batch Processing Python
I have an error i cant figure out (likely a beginners error):
#
Base = declarative_base()
class tablemeta(DeclarativeMeta):
def __new__(mcls, name):
return DeclarativeMeta.__new__(mcls, name, (Base,), {})
def _init__(cls,
thanks, I will start experimenting ...
On Mar 5, 4:52 pm, Michael Bayer mike...@zzzcomputing.com wrote:
On Mar 5, 2011, at 10:43 AM, farcat wrote:
Hi,
I am trying to implement polymorphism and multiple inheritance by:
- adding a column to the parent class/table indicating
Hi,
I am trying to implement polymorphism and multiple inheritance by:
- adding a column to the parent class/table indicating the table from
which the (polymorphic) class attribute object can be queried
- adding the attribute name and the parent id to the child table/class
to be able to find the
Hi,
I have been reading the posts on implementing multiple inheritance in
SA. I have a question, for a slightly simpler method of MI, where
there is no overriding of attributes (and e.g. therefore no diamond
problem). This would mean that all underlying tables for classes could
contain columns
thought i'd post the code I came up with for reference:
from sqlalchemy import *
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship, sessionmaker
from sqlalchemy.ext.associationproxy import association_proxy
Base = declarative_base()
def
Thank you,
Basically the multiple inheritance structure is a directional non-
cyclic graph (i looked at the graph example code in the distribution,
it uses methods to get next/previous nodes) . Members are basically
another name for attributes.
I understand the need for the primaryjoin now.
Thank you,
Basically the multiple inheritance structure is a directional non-
cyclic graph (i looked at the graph example code in the distribution,
it uses methods to get next/previous nodes, which could serve as a
workaround, but seems inelegant) . Members are basically another name
for
Thank you, the many to many (following the pattern in the link above)
seems to work, now on to the association table (later ... )
Cheers
BTW: in A - (one to many) B - C, does (seen from A) primaryjoin
refer to the relation between A and B and secondaryjoin to the
relation between B and C?
Hi,
I am trying to implement tables to store a basic multiple inheritance
scheme via SA. I am pretty new to SA and could use some help with the
following code:
code
from sqlalchemy import *
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship,
Hi everyone,
I am new to sqlalchemy and figuring out whether it is right for my
project. What I am looking for is the ability to change classes and
tables on the flight, with as much freedom as possible, potentially
having metaclasses figuring out the difference between versions and
updating the
Thank you, that works.
Is there any way to later add or remove attributes, using the
declarative system?
Cheers, Lars
On Feb 8, 10:46 pm, Michael Bayer mike...@zzzcomputing.com wrote:
On Feb 8, 2011, at 3:52 PM, farcat wrote:
Hi everyone,
I am new to sqlalchemy and figuring out
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