Yep, you're right... That's exactly what's happening. The set event
is, indeed self._values = []
The issue is that I can't upgrade to SqlAlchemy 0.7...
Anyway... thank you for the help... I'll have to look for a workaround...
2012/7/9 Michael Bayer :
>
> On J
Hello everyone.
I have a class that uses a "custom" column to store a list of strings.
The column is saved in the database using a comma sepparated string.
When it's loaded into an instance, it "becomes" a list:
class Keyword(declarativeBase):
__tablename__ = "keywords"
_id = Colu
2 days trying by myself... 20 minutes with your answer... I still
don't know why I didn't try what you said...
Thank you, Michael
2012/5/16 Michael Bayer :
>
> On May 16, 2012, at 5:50 PM, Hector Blanco wrote:
>
>> Hello everybody!
>>
>> I would like
Hello everybody!
I would like to know if it's possible to create an optimized query
that gives all the elements of a class A that have a relationship to
an specific class B
Here's the thing:
I have a pretty simple class "Region" that defines an area in the screen:
class Region(declarativeBase)
Hello everyone!
I am continuing with the migration from SqlAlchemy 0.6.8 to 0.7.4, and
I've seen a little difference in behavior.
I have a class Product (more or less) like:
class Product(declarativeBase):
_id = Column("id", Integer, primary_key=True)
_model = Column("model", Uni
or you
> might have a different flavor of synonym. So need a full reproducing test
> case as a trac ticket please thanks !
>
>
>
>
> On Dec 11, 2011, at 12:52 AM, Hector Blanco wrote:
>
>> I would like to. I've been testing 0.7.4, and it seems to work really
>> fast,
>
> The workaround is very simple, just say "A.id==5" instead of "id=5". The
> bug itself is fixed in r99564ce1414c.
>
Ah, yeah! That works! I find using the double "==" for comparison
clearer (just a personal opinion)
>
>
> --
> You received this message because you are subscribed to the Goog
Hello everyone!
I'm trying to migrate from SqlAlchemy 0.6.8 to 0.7.4.
I have a class that is the base for all the bases in my system. In
that class is where I define the id (numeric primary key) for the rest
of my classes. That class is not mapped to any table.
I want to have getter/setter for s
that this particular check is unnecessary, and you should upgrade to 0.7.
>
>
> On Dec 11, 2011, at 12:00 AM, Hector Blanco wrote:
>
>> Thank you for your reply.
>>
>> I'm not exactly sure of what is blocking the insert. I would say
>> SqlAlchemy, because m
d... written in the database when I start loading
the child
Again, thank you
2011/12/10 Michael Bayer :
>
> On Dec 10, 2011, at 7:07 PM, Hector Blanco wrote:
>
>>
>>
>> That data (is JSON) is sent to the Category "handler". That handler
>> does the foll
Sorry, I messed up the subject of the email
-- Forwarded message --
From: Hector Blanco
Date: 2011/12/10
Subject: SqlAclhemy 0.6.8
To: sqlalchemy@googlegroups.com
Hello everyone!
In my application, I have a class Product that can belong to a
Category. (1 product, 1 category
Hello everyone!
In my application, I have a class Product that can belong to a
Category. (1 product, 1 category). The category knows which products
belong to it thanks to a backref. A product can not exist if
it doesn't belong to a category. If a category is deleted, all it's
products are deleted
r), check whether it's an AssociationProxy,
and then do what it is described in Michael's solution, but maybe
someone knows a cleaner way?
Thank you in advance!
Thanks in advance!
2011/12/7 Michael Bayer :
>
> On Dec 7, 2011, at 7:53 PM, Hector Blanco wrote:
>
>> Hello
Yes! Thank you for your, as usual :-) , quick, wise and right reply!
I believe that's all I need. I already have in place all the machinery
to deal with Columns, relationships, and stuff like that! Awesome (or
as we would pronounce in my mother tongue, Spanish... osom!! )
2011/12/7 Michael Bayer
Hello everyone:
In one of my classes, I am using an associationproxy to provide a list
in which the same item can be inserted twice. Basically, a product can
contain "images" (several times the same image). One product can have
two different lists of "images" (images1 and images2... yep... not
ve
@validates... Where have you been? Oh... In the documentation, all
along. The day I learn to read, I'll conquer the world
It works great. Thank you!
2011/12/1 Michael Bayer :
>
> On Nov 30, 2011, at 7:48 PM, Hector Blanco wrote:
>
>> Hello everyone!
>>
>> I a
Hello everyone!
I am using (yeah, still) SqlAlchemy 0.6.8 and I'm using an
AttributeExtension to build permissions of users.
My users get the permissions depending on the UserGroup they're in.
The user has the typical relationship towards "UserGroup".
My classes:
-- User.py-
Hi everyone:
I have an object structure that uses (heavily) object orientation.
I have a "BaseObject" class that is the class for three kinds of
subclasses, "Element1", "Element2" and "Element3". In my application I
have a tree of "BaseObject" elements:
class BaseObject(declarative):
__t
I'm not sure if this will be helpful, but I found the types decorators
very useful :
http://www.sqlalchemy.org/docs/core/types.html#typedecorator-recipes
You can basically keep a list() in your instances and do something
when you want to save it in the database (such as saving them as a
comma sep
and how any() and outerjoin() are more appropriate if OR
> conjunctions are used:
>
> http://www.sqlalchemy.org/docs/orm/internals.html#sqlalchemy.orm.properties.RelationshipProperty.Comparator.contains
>
>
> On May 24, 2011, at 7:51 PM, Hector Blanco wrote:
>
>> Hello everybody
Hello everybody...
Let's say I have a class like this:
class Foo(declarativeBase):
bars1 = relationship(Bar.Bar, secondary=foos_to_bars1,
collection_class=set())
bars2 = relationship(Bar.Bar, secondary=foos_to_bars2,
collection_class=list())
At a certain point, I want to get instance
Hello everyone!
I have an application with a "BaseVisibilizer" class that is base
class for two other classes:
class BaseVisibilizer(declarativeBase):
__tablename__ = "base_visibilizers"
_polymorphicIdentity = Column("polymorphic_identity", String(20),
key="polymorphicIdentity")
Hello everyone... I'm experiencing an strange behavior with an
instrumented list...
On one hand, I have a class called "BaseMedia" that is the base type
for Images, Videos... On the other hand I have a class "Schedule" that
is the base class for "schedulable" things in my system and then I
have so
That is what I was looking for!
http://www.sqlalchemy.org/docs/orm/interfaces.html?highlight=attributeextension#sqlalchemy.orm.interfaces.AttributeExtension
Thank you very much!
2011/4/10 Michael Trier :
> On Sat, Apr 9, 2011 at 10:32 PM, Hector Blanco
> wrote:
>>
>> Unassigni
Unassigning a user from its userGroup, indeed, puts the UserGroup in
that user to NULL. But it turns out that the entity that controls the
permissions is a third thing. That "thing" takes some fields of the
User class (id, name...) and generates an instance of a third object
which is in charge of c
Hello everyone!
I have an application with Users and UserGroups... The users have
certain permissions to do stuff in the application depending on the
UserGroup they belong to. The relationship is as follows:
--
class User(BaseClass.BaseClass, Database.Base):
Thanks for the quick reply.
I'll give it a try.
2011/4/8 Michael Bayer :
>
> On Apr 8, 2011, at 12:12 PM, Hector Blanco wrote:
>
>> Hello everyone:
>>
>> I have a tree-like structure (groups/nodes, basically) with Stores and
>> StoreGroups. An store can
Hello everyone:
I have a tree-like structure (groups/nodes, basically) with Stores and
StoreGroups. An store can belong only to one storeGroup, but an
StoreGroup can contain stores or other storeGroups:
class StoreGroup(BaseClass.BaseClass, Database.Base):
"""Represents a storeGroup"""
Hello everyone.
I was wondering what is the best way to perform a query filtering by
"not" in a python-way.
In python:
>> not(None)
True
>> not(list())
True
Let's say I have a class that has the typical "children" relationship:
class Foo(declarative_base):
__tablename__ = "foos"
ckages you mentioned. Looks like they might
be helpful
Thanks!
2011/3/24 Wichert Akkerman :
> On 3/23/11 23:11 , Hector Blanco wrote:
>>
>> Yeah... the closing thing is because this is going to be in a
>> webserver, and the framework that controls the requests really, rea
Yeeey!!
It works!
I had to deal with the primaryjoins/secondaryjoins thing but it worked.
I'm attaching it, just in case it can help someone else!
2011/3/23 Hector Blanco :
> Thank you so much!
>
> I'll let you know!
>
> P.S.:
> just create the m2m table fo
Thank you so much!
I'll let you know!
P.S.:
just create the m2m table for the relationship as needed.
... and this is another evidence that my brain is not 100%
functional... Why didn't it occur to me? I dunno...
2011/3/23 Michael Bayer :
>
> On Mar 23, 2011, at 5:47 P
stopped the server)
That was me:
http://groups.google.com/group/sqlalchemy/browse_thread/thread/5a3c7c8056cf6a60/6805bbe38667b9be?lnk=gst&q=Hector+Blanco#6805bbe38667b9be
That's why I decided to commit, close, and such as soon as possible
(leave the sessions opened as little as possible)
Th
Hello everyone.
I have a kind of "virtual" class that I want to use as base class for
all the elements that are going to be stored in the database.
Initially I had:
-- BaseClass.py --
class BaseClass(object):
_id = Column("id", Integer, primary_key=True, key="id")
Hello everyone...
I am getting detached instances error and I don't really know why.
There's something I don't get with the session, but I have been
reading the documentation thoroughly, trying many things and I can't
get rid of all the DetachedInstance exceptions... That's why I think
I'm doing s
ar.gz?download)
In the examples/association/basic_association.py file.
Nice!.
P.S.: Now I'm a little bit down, because I've spent one whole day
figuring out something that is explained inside a file called
"basic_association"... :-D What will be an "advanced_association"
e 'corresponding_column'
In some other cases I get "Store"s (instances) but they are not
properly filtered. It looks like it's getting all the stores assigned
to any userGroup, without filtering by the user id...
Now I'm kind of lost.
Thank you in advance!
2011/3/16 Hecto
someone :)
2011/3/16 Hector Blanco :
> Hello everyone!
>
> In my application I have a class "Store" that can contain several
> "UserGroup"s (for permission purposes) and one "UserGroup" can belong
> to several "Stores".
>
> I want to
Hello everyone!
In my application I have a class "Store" that can contain several
"UserGroup"s (for permission purposes) and one "UserGroup" can belong
to several "Stores".
I want to get the "Stores" that contain a certain "UserGroup" (instance):
I have it modeled like this:
class Store(declara
I see... I'll work something out.
Thank you Mr. Bayer!!
2011/3/1 Michael Bayer :
>
> On Mar 1, 2011, at 5:50 PM, Hector Blanco wrote:
>
> Hello everyone:
>
> Let's say I have a class "User" and a class "UserGroup". One user can
> belong to one
Hello everyone:
Let's say I have a class "User" and a class "UserGroup". One user can
belong to one userGroup, an a userGroup can contain several users
(pretty typical structure). It's a simple relationship I got modeled
like:
class UserGroup(declarativeBase):
"""Represents a group of use
Hello everyone:
Let's say I have a class "User" and a class "UserGroup". One user can
belong to one userGroup, an a userGroup can contain several users
(pretty typical structure). It's a simple relationship I got modeled
like:
class UserGroup(declarativeBase):
"""Represents a group of us
uggestion... whatever! you may have
will be very appreciated...
As usual, thank you so much!
2011/2/27 Michael Bayer :
>
> On Feb 27, 2011, at 6:45 PM, Hector Blanco wrote:
>
>> A few days ago I asked what appears in the body of the message, a few
>> lines below. To summarize:
&
" in a set
(for the method that tries to get relationships, that set would be
set("_userGroup") and for the one that tries to get foreign keys,
set("_userGroupId")) . In a second "for" loop they match that
"underscored" name with the name of the sy
now I won't sleep
soundly at night until I change all my code... But hey... This is what
learning while coding has :-) I will have to "expunge" my old ideas
from my brain and update my code... I hope I can quickly flush the
changes, though
Thank you!
2011/2/24 Michael Bayer :
>
&
Hello everyone...
I'd like to know what do you think it's better: Whether using backrefs
or "manually" defining the relationships one by one. Are the backrefs
useful to code less code or do they have other advantages?
I.e.: Let's say I have a User and a UserGroup class with (initially)
the relati
It was working from gecko...
I hadn't considered my dumbness.. I went trough all the records in my
database and it turns out I was having way more WhateverClass in the
ContainerClass with id == 5 than I thought!!! It was working from the
beginning!
2011/2/12 Hector Blanco :
> Sorry... I
Amazing:
session.query(Cashier.Cashier).join(Register.Register).join(Store.Store).all()
I hadn't tried before because I thought it would be too straight forward...
2011/2/16 Hector Blanco :
> Hello everyone!
>
> I have a class structure like this:
>
> class S
I'll give it a try!!
Thank you!
2011/2/18 Michael Bayer :
>
> On Feb 17, 2011, at 6:37 PM, Hector Blanco wrote:
>
>> Hello everyone!
>>
>> Let's say I have a class defined like this:
>>
>> class User(declarativeBase):
>>
Hello everyone!
Let's say I have a class defined like this:
class User(declarativeBase):
"""Represents a user"""
__tablename__ = "users"
_id = Column("id", Integer, primary_key=True)
_phone = Column("phone", String(16))
_userName = Column("user_name", Stri
Just a wild guess, but have you tried making your association table like:
#association table
user_group_table = Table('t_user_group', metadata,
Column('user_id', Integer, ForeignKey('t_user.c.user_id',
onupdate="CASCADE", ondelete="CASCADE")),
Column('group_id', Integer, ForeignKey('t
Hello everyone!
I have a class structure like this:
class Store(declarativeBase):
__tablename__ = "stores"
id = Column("id", Integer, primary_key=True)
name = Column("name", String(50))
registers = relationship("Register", cascade="all, delete",
collection_class=s
Sorry... I just sow a typo:
Hello everyone.
I am trying to get classes whose foreign key is "whatever" but I
always get all the entries in the database, instead of the ones that
match the criterion.
Let's say I have a couple of classes using declarative base in a
relationship N:1. I have that m
Hello everyone.
I am trying to get classes whose foreign key is "whatever" but I
always get all the entries in the database, instead of the ones that
match the criterion.
Let's say I have a couple of classes using declarative base in a
relationship N:1. I have that modeled like:
class OtherClass
2011/1/16 Tamás Bajusz :
> Is your work available, or do you plan to put it public somewhere?
>
Mmm... maybe... contact me privately if you're interested
--
You received this message because you are subscribed to the Google Groups
"sqlalchemy" group.
To post to this group, send email to sqlalch
y... if my idea is not wrong, I'll check if the error is
somewhere else. It's good to know that I'm going in the right
direction!
Thank you!
2011/1/21 A.M. :
>
> On Jan 21, 2011, at 12:29 PM, Hector Blanco wrote:
>
>> Hello list!
>>
>> I have a couple of
Hello list!
I have a couple of classes. One of the behaves as the container of the other:
class ContainerOfSamples(declarativeBase):
__tablename__ = "containers"
_id = Column("id", Integer, primary_key=True)
_samples = relationship("Samples", cascade="all, delete",
colle
+1
2011/1/16 Jan Müller :
> +1
>
> On Jan 15, 9:58 am, Eric Ongerth wrote:
>> +1
>>
>> On Jan 13, 5:08 pm, rdlowrey wrote:
>>
>>
>>
>>
>>
>>
>>
>> > To Michael Bayer: sqlalchemy simplifies my life every day and makes me
>> > vastly more productive! Many thanks.
>
> --
> You received this message
Thanks for replying so quickly...
> if the user says "number == '5' ", why not consider that to be a string ?
> why is casting needed ? if they want an int, they should type an int, no ?
>
I don't trust my users :-) I don't think they know what they want,
most of the times :-D
>>
>> The probl
Hello everyone!
I have created a little module that generates a sqlalchemy query from
an string (yeah, I needed some help:
http://groups.google.com/group/sqlalchemy/browse_thread/thread/6ea3241b1c653444
)
At certain point, I check the type of the field I'm filtering
by creating an instance of the
f the comparator for the field/synonym (if I
wanted to check for "model == 'foo'", I needed to get:
getattr(Product.model, "__eq__").
Yey!! It works!
Thank you so much!!
2011/1/16 Michael Bayer :
>
> On Jan 15, 2011, at 10:53 PM, Hector Blanco wrote:
>
>&g
Hello list...
I would like to allow the users to perform certain queries without me
(or well... my server) knowing in advance what those queries are going
to be (without hard-coding the query).
For instance: I have a “Product” class. One of it's fields is
"manufacturer" and another is "model"
cl
Works like a charm!
Thank you! (once again)
2011/1/3 Michael Bayer :
> I'd keep each path separate, i.e.
>
> query.options(*[joinedload_all(path) for path in relationshipsToPreLoad])
>
>
> On Jan 3, 2011, at 10:55 AM, Hector Blanco wrote:
>
>> Hi list!
>>
Hi list!
I am facing a little problem whose I'm sure has a very simple
solution, but I haven't been able to find it (the solution, I mean)...
I would like to be able to pass the fields (relationships) I want to
pre-load as a parameter. Let's say I have a couple of classes:
--
With that (catching all the errors) seems to work better.
It also seems that the "problem" improves if I wait a bit (4 or 5
seconds) after the server is started...
2010/12/23 Hector Blanco :
> Ok! I'll let you know...
>
> Thank you so much!
>
> It seems to fail
he
> Python warnings filter to emit those warnings as exceptions, in which you
> should be able to get stack traces in your logs.
>
>
> On Dec 23, 2010, at 3:02 PM, Hector Blanco wrote:
>
>> Thank you for your quick reply!
>>
>> I tried to change the
t creates the database, a new
User() instance is created, with a few default values (userName =
test, for instance) and it's added to the database using this "update"
method (said user doesn't have an id, so it should be added using
add(user) ). Then I try to login with the user &quo
Hello everyone!
I am currently working with a webserver (Grok) that starts different
threads (automatically) for the requests that arrive to it.
The information is serialized in a MySQL database (which is acceded
through SqlAlchemy). The users' information is stored in that MySQL
database. The pl
mapper.iterate_properties ?
>
>
> On Dec 21, 2010, at 11:14 AM, Hector Blanco wrote:
>
>> I found a "maybe" way... but I don't know if it's good idea... the
>> "propertyProxy" instances have
---
That works...
Properties found: '['id', password', 'userName']'
...but I don't really know what I'm exactly touching here... (and how
"dangerous"... or correct it may be)
2010/12/21 Hector Blanco :
> First of all, thank y
instance_state", "_id", "_userName", "_password"]),
then check if these variables are instrumented ("_sa_instance_state"
isn't) and then check if the class has the attributes ["id",
"userName" and "password"] but
Hello all!
I have an application running under Python2.6 and the classes are set
up with properties (in a Python2.4 style, though).
Everything seems to be working fine with SqlAlchemy (version 0.6.5,
just in case) as it explains here:
http://www.sqlalchemy.org/docs/orm/extensions/declarative.html
Thank you all... As soon as I have the webserver where I'm going to
use that structure up and running, I'll try it and i'll let you
know...
2010/12/13 Laurent Rahuel :
> Hello,
>
> You should also take a look at http://pypi.python.org/pypi/sqlamp/0.5.2, an
> implementation of Materialized Path fo
hello everyone!
I was wondering which is the best way to model a tree-looking
structure with SqlAlchemy.
Right now, I have this two classes:
#!/usr/bin/python2.6
class MyNode(object):
def __init__(self):
self.items = list()
ate your effort! :) I'll keep you posted!
2010/11/13 jason kirtland :
> Hi Hector,
>
> On Fri, Nov 12, 2010 at 7:46 AM, Hector Blanco wrote:
>> Hello everyone.
>>
>> I was wondering if it's possible to inherit a custom collection to
>> create another cust
ld/ be handled as just another
> relationship on the opposite mapper.
>
> On Nov 12, 7:31 am, Hector Blanco wrote:
>> 2010/11/12 Eric Ongerth :
>>
>> > Hi Hector,
>>
>> > If I'm not mistaken, everywhere you wrote
>> > (MyObject.id==MyObject.
Hello everyone.
I was wondering if it's possible to inherit a custom collection to
create another custom collection.
A few days ago I was trying to use my own class as a custom_collection
(http://groups.google.com/group/sqlalchemy/msg/ba1c64c3d227f586).
Thanks to Michael Bayer I w
2010/11/12 Eric Ongerth :
> Hi Hector,
>
> If I'm not mistaken, everywhere you wrote
> (MyObject.id==MyObject.containerId),
> you meant to write: (Container.id==MyObject.containerId).
>
Ups... yeah... great eye.
> Instead of the backref technique, why not just create the MyObject--
>>Container re
I have a class that has two relationships to the same type of objects.
One of the relationships will store objects of type "VR" and the other
objects with a type "CC". One object can only be in one of the lists
(relationships) at the same time:
This is the "container" class and its two relationshi
nly)
* Using strings or callables as primaryjoin/secondaryjoin arguments
in a relationship()
-
but I'd like to understand a little bit more how does it work (what's
going on internally) so I won't make similar errors in the future.
Thank yo
Hello everyone...
I'm trying to use a custom collection to "connect" (or relate) two
classes but I haven't been able to do it. Maybe I got the whole
concept of the custom collections wrong, but let me explain what I am
doing (and see if someone can give me a hint, or something)
I have a Parent cl
Hi List...
I have been asking a lot lately about a 1:2 relationship with MeGrok
and SqlAlchemy, and I think I've solved it.
I have created a mini how to just in case it could help anyone.
ODT > http://www.hectorblanco.org/files/odt/Megrok%20Relation%201:2.odt
PDF > http://www.hectorblanco.org/fi
Oh, and regarding the other part of your answer:
>
> These class definitions should be merged with those in Tables.py. You should
> only have one "class Parent" statement and one "class Child" statement. You
> may be confusing this with the non-declarative class setup, where you define
> the table
-relations-11-or-one-12),
and someone said it's more correct this last approach (of keeping the
parent_id in the children and distinguish the type of the children
through a Child.type field).
2010/10/29 Conor :
> On 10/29/2010 11:51 AM, Hector Blanco wrote:
>
> Thanks Conor!
>
>
lse, assert_unicode=None, unicode_error=None,
_warn_on_bytestring=False), table=), schema='test')}
As you can see, the parent table appears as "test.parents_table", not
"parents_table".
I don't think this was SqlAlchemy "fault", but more the megrok.rdb
thing
as there) but I
don't think that under any concept re-writing code is a good idea so
I'll try to change it.
Thank you for the very well explained and detailed reply.
2010/10/29 Conor :
> On 10/29/2010 05:31 PM, Hector Blanco wrote:
>
> Hello, group!
>
> I am still deal
Hello, group!
I am still dealing with the relationship I asked before
(http://groups.google.com/group/sqlalchemy/browse_thread/thread/c1d46daf35116999).
To tell the truth, I'm not even sure if this is a question I should
ask in the SqlAlchemy forum because I'm also dealing with Megrok.rdb
(http:/
ing ones.
The way I asked in my former question would imply creating a new
relationship AND adding a new foreign key to the parent.
I'd like to know what people that know much more about databases think :)
2010/10/29 Conor :
> On 10/29/2010 09:43 AM, Hector Blanco wrote:
>
> Hello
Hello list...
I wrote a couple of days ago about how to model an structure of three
classes
(http://groups.google.com/group/sqlalchemy/browse_thread/thread/5ba5c4ad16f789d6#).
I thing I almost have it, but I am still getting problems mapping an
structure like this.
class Child(rdb.Model):
Hi group!
I am trying to migrate my application from ZopeDB to MySql. I am using
sqlalchemy under megrok.rdb.
I have a class which inherits from list() and has a few extra methods.
Reading the chapter about custom collections in sqlalchemy
(http://www.sqlalchemy.org/docs/orm/collections.html#cust
I hate when the identation gets messed up... Gonna try again:
Yuuup... It works like a charm!
I have created a simple class that gets a dictionary and "serializes"
its values. The underlying database is MySql...
Just in case my code may help someone (or if someone has any
suggestions...) here it
Yuuup... It works like a charm!
I have created a simple class that gets a dictionary and "serializes" its
values. The underlying database is MySql...
Just in case my code may help someone (or if someone has any suggestions...)
here it goes:
from sqlalchemy import types
import logging
log = loggi
Hello everyone.
First of all, thank you for reading this (no matter whether you can/want to
help me or not) :-)
Second, the question:
I am using sqlalchemy under MeGrok (http://pypi.python.org/pypi/megrok.rdb)
to have my Python/Grok classes stored over a RDBMS (MySql) database.
I have a Python
Wow... I just saw this...
http://www.sqlalchemy.org/docs/05/reference/sqlalchemy/types.html#sqlalchemy.types.TypeDecorator
Maybe that's what I need! I'll confirm (for future questions) :-)
2010/10/25 Hector Blanco
> Hello everyone.
>
> First of all, thank you for reading this
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