I tried this....
class UserGroup(DomainObject):
pass
assign_mapper(context, UserGroup, tbl['acl'],
properties = {
'id_operatore': tbl['acl'].c.id_operatore, 'user_id' : synonym('id_operatore', proxy=True),
'cod_ruolo' : tbl['acl'].c.cod_ruolo, 'group_id':
synonym('cod_ruolo', proxy=True)
}
)
but...
File "build/bdist.linux-i686/egg/sqlalchemy/orm/mapper.py", line 552, in init
File "build/bdist.linux-i686/egg/sqlalchemy/ext/assignmapper.py", line 23, in
__init__
File "build/bdist.linux-i686/egg/sqlalchemy/orm/properties.py", line 38, in
__set__
AttributeError: 'SynonymProperty' object has no attribute 'set'
Michael Bayer wrote:
in both of these cases, a particular Column can only be expressed on
the Mapper once. I should add some error checking to Mapper to
insure that this is followed. The reason is simple: if a class has
two attributes "a" and "b" which both point to a column "C", and I
set "a" to "5" and "b" to "7" and then flush(), which attribute do I
persist ?
therefore, a quick way to make a synonym for these attributes is to
use "synonym" with proxy=True which will automatically set up the
attribute on the class:
mapper(Class, table, properties={
'id':table.c.id,
'name':synonym('id', proxy=True)
})
where both "id" and "name" utlimately point to just the "id"
information on the class.
On Jan 19, 2007, at 9:48 AM, Jose Soares wrote:
I think I have a similar trouble, although the symptoms are different.
I have a PostgreSQL table named 'acl' mapped as UserGroup.
Table acl
Column | Type --------------+---------
id | integer
id_operatore | integer
cod_ruolo | text id_asl | integer
id_azienda | integer
I overriding some columns as: (take a look specially to group_id =
cod_ruolo):
class UserGroup(DomainObject):
pass
assign_mapper(context, UserGroup, tbl['acl'],
properties = { 'user_id' : tbl['acl'].c.id_operatore,
'id_operatore': tbl['acl'].c.id_operatore,
'group_id' : tbl['acl'].c.cod_ruolo,
'cod_ruolo' : tbl['acl'].c.cod_ruolo})
I have this problem, triyng to insert data...
the first line works but the second one, doesn't inser any data into
column cod_ruolo.
1. id_operatore = item.get('id_operatore'), group_id = item.get
('cod_ruolo'))
2. id_operatore = item.get('id_operatore'), cod_ruolo = item.get
('cod_ruolo'))
Any ideas?
jo
Marco Mariani ha scritto:
Hi there
This relates to Turbogears, but is really a SA question.
I've customized TG authentication & authorization to use my autloaded
tables in Postgres and SqlAlchemy 0.3.3.
In my schema, I have User.c.uid, the login name of the users, as a
primary key
TG uses a User mapper with two distinct columns: User.c.user_id (the
primary key) and User.c.user_name (the logname).
Since I am an avid fan of meaningful primary keys (and have a
legacy db
to support) I want to keep things my way, but TG does some user
handling
that I have to fix.
So, to avoid patches to the TG source or useless sub-classing, I'd
like
to access the same column by any of the three names.
I cannot do that with a python property on the mapper because TG
should
be able to use get_by and friends.
I've come up with:
assign_mapper(context, User, tbl['users'], properties = {
'user_id': tbl['users'].c.uid, # alias for SqlAlchemyIdentity
'user_name': tbl['users'].c.uid, # alias for SqlAlchemyIdentity
'uid': tbl['users'].c.uid,
})
This seems to work (I added the third property to make 'uid'
reappear!)
, but makes it impossible, for instance, to create new users:
In [1]: user = User(uid='xxx')
In [2]: session.flush()
[...]
SQLError: (IntegrityError) null value in column "uid" violates not-
null
constraint
'INSERT INTO users (uid, nome, cognome, codice_fiscale) VALUES
(%(uid)s, %(name)s, %(surname)s)' {'surname': None, 'uid': None,
'name':
None}
In [3]: user = User(user_id='xxx')
In [4]: session.flush()
[...]
SQLError: (IntegrityError) null value in column "uid" violates not-
null
constraint
'INSERT INTO users (uid, nome, cognome, codice_fiscale) VALUES
(%(uid)s, %(name)s, %(surname)s)' {'surname': None, 'uid': None,
'name':
None}
I reckon I should probably go ahead and patch TG, but maybe there is a
clean way to do what I have in mind?
Thank you.
>
>
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