On Apr 25, 12:37 am, Newt <strejda.n...@gmail.com> wrote:
> Hello,
>
> in my latest application I have models with like 15 Decimal fields,
> with different decimal places.
>
> when I try to save an object of that model, I get sometimes (often,
> but not always) this error:
>
> File "/home/newt/django/1.0/sites/cdms/item/views.py", line 1054, in
> item_copy
> object.save()
>
> File "/home/newt/django/1.0/lib/django/db/models/base.py", line 311,
> in save
>
> File "/home/newt/django/1.0/lib/django/db/models/base.py", line 371,
> in save_base
>
> File "/home/newt/django/1.0/lib/django/db/models/fields/
> __init__.py", line 192, in get_db_prep_save
>
> File "/home/newt/django/1.0/lib/django/db/models/fields/
> __init__.py", line 609, in get_db_prep_value
>
> File "/home/newt/django/1.0/lib/django/db/models/fields/
> __init__.py", line 583, in to_python
>
> File "/usr/lib/python2.5/decimal.py", line 650, in __new__
> raise TypeError("Cannot convert %r to Decimal" % value)
>
> TypeError: Cannot convert Decimal("0.0000") to Decimal
>
> It fails on the first decimal field (at it's only one with 4 decimal
> places) and it just happens sometimes.
> I remember something like that used to happen with psycopg2 some year
> ago.
The psycopg2 problem was because the C extension module which is a
part of it wasn't implemented correctly so as to work in a Python sub
interpreter. The problems with that would only manifest when using
mod_python or mod_wsgi and application running in sub interpreter and
not main interpreter.
So, to start with, how are you hosting this application?
Graham
> I think it breaks when it tries to get the data ready for the SQL
> statement.
>
> In this project I have to use django-pyodbc connector to MSSQL
> database.
>
> I have tried both 1.02 and 1.1b branches of the connector with same
> errorous results.
>
> It's the most frustrating bug in django so far, as I'm completely
> helpless and even google's silent about this.
>
> Please does anyone know what's causing this, or how to get rid of
> it...
>
> thanks,
>
> Ales
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