I have small question regarding the viewonly property. Can I assign
viewonly to a column? In the SqlA example it's used together with
relationship(), I need to mark viewonly just table column.
For example:
RecordTable = Table('t_record', metadata,
Column('record_id', Integer, primary_key = True),
Column('idx', Integer, default=None),
Column('msg', UnicodeText)
)
class RecordModel(object):
def __init__(self, msg = u""):
self.msg = msg
def __repr__(self):
return u"REC - Idx(" + unicode(self.idx) + u"), Msg(" + self.msg + u")"
orm.mapper(RecordModel, RecordTable,
properties = {
"id": RecordTable.c.record_id,
"idx": RecordTable.c.idx, #### MARK ReadOnly? ####
"msg": RecordTable.c.msg
}
)
Thanks a lot
Best regards
Petr Kobalicek
On Mon, Aug 30, 2010 at 4:51 AM, Petr Kobalíček
<[email protected]> wrote:
> Hi devs,
>
> thanks for replies!
>
> Michael: I asked probably wrong question. I know how to make property
> read-only in Python, but I wanted the property to be read-only at ORM
> level (so it will not appear in UPDATE).
>
> Mark: This is probably is solution to my problem.
>
> I'm trying to create an abstract wrapper for ordered-list records. I
> wanted to post example which describes what I'm doing, but I will
> create another topic when basic features will be working.
>
> Best regards
> Petr
>
> On Mon, Aug 30, 2010 at 3:59 AM, Mark <[email protected]> wrote:
>> Hi Petr,
>>
>> You may want to have a look at this link
>> http://www.sqlalchemy.org/docs/mappers.html#building-query-enabled-properties
>>
>> Setting the viewonly=True property in your mapper configuration does
>> exactly what you want. I've used it a couple of times in my own
>> project and it works.
>>
>> -Mark
>>
>> On Aug 29, 10:00 pm, Petr Kobalíček <[email protected]> wrote:
>>> Hi devs,
>>>
>>> is there a simple way how to make an ORM property read only? I need to
>>> fetch the column from database so it will be accessible through the
>>> mapped class, but I need that the property will be never updated back
>>> to the database (in case I add the object to the session and do
>>> commit).
>>>
>>> Thanks!
>>>
>>> Best regards
>>> Petr Kobalicek
>>
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