#24636: InvalidOperation saving decimal.Decimal
-------------------------------------+-------------------------------------
Reporter: glic3rinu | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 1.8
(models, ORM) |
Severity: Normal | Resolution:
Keywords: InvalidOperation | Triage Stage:
decimal Decimal | Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by glic3rinu):
{{{
class InvalidOperationModel(models.Model):
value = models.DecimalField(max_digits=2, decimal_places=2)
}}}
{{{
>>> a = InvalidOperationModel(value=1)
>>> a.full_clean()
>>> a.save()
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/usr/local/lib/python3.4/dist-packages/django/db/models/base.py",
line 710, in save
force_update=force_update, update_fields=update_fields)
File "/usr/local/lib/python3.4/dist-packages/django/db/models/base.py",
line 738, in save_base
updated = self._save_table(raw, cls, force_insert, force_update,
using, update_fields)
File "/usr/local/lib/python3.4/dist-packages/django/db/models/base.py",
line 822, in _save_table
result = self._do_insert(cls._base_manager, using, fields, update_pk,
raw)
File "/usr/local/lib/python3.4/dist-packages/django/db/models/base.py",
line 861, in _do_insert
using=using, raw=raw)
File "/usr/local/lib/python3.4/dist-
packages/django/db/models/manager.py", line 127, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/usr/local/lib/python3.4/dist-packages/django/db/models/query.py",
line 920, in _insert
return query.get_compiler(using=using).execute_sql(return_id)
File "/usr/local/lib/python3.4/dist-
packages/django/db/models/sql/compiler.py", line 962, in execute_sql
for sql, params in self.as_sql():
File "/usr/local/lib/python3.4/dist-
packages/django/db/models/sql/compiler.py", line 920, in as_sql
for obj in self.query.objs
File "/usr/local/lib/python3.4/dist-
packages/django/db/models/sql/compiler.py", line 920, in <listcomp>
for obj in self.query.objs
File "/usr/local/lib/python3.4/dist-
packages/django/db/models/sql/compiler.py", line 918, in <listcomp>
) for f in fields
File "/usr/local/lib/python3.4/dist-
packages/django/db/models/fields/__init__.py", line 1627, in
get_db_prep_save
self.max_digits, self.decimal_places)
File "/usr/local/lib/python3.4/dist-
packages/django/db/backends/base/operations.py", line 477, in
value_to_db_decimal
return utils.format_number(value, max_digits, decimal_places)
File "/usr/local/lib/python3.4/dist-
packages/django/db/backends/utils.py", line 200, in format_number
value = value.quantize(decimal.Decimal(".1") ** decimal_places,
context=context)
decimal.InvalidOperation: [<class 'decimal.InvalidOperation'>]
}}}
with `max_digits=3` works for `value=1`, but fails for `value=11`.
the documentation says that `max_digits` must be "greater than or equal to
decimal_places''.
https://docs.djangoproject.com/en/dev/ref/models/fields/#django.db.models.DecimalField.max_digits
I believe this could be a regression introduced in 1.8, since my code
appeared to work in 1.7.
--
Ticket URL: <https://code.djangoproject.com/ticket/24636#comment:2>
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