#14438: Deserializer raises ValidationError if natural key is given as string
-------------------------------------+-------------------------------------
Reporter: zimnyx | Owner: nobody
Type: Bug | Status: reopened
Component: Core | Version: 1.2
(Serialization) | Resolution:
Severity: Normal | Triage Stage:
Keywords: | Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Changes (by Dmitry Kaloshkin <demon.koshkin@...>):
* status: closed => reopened
* severity: => Normal
* resolution: worksforme =>
* version: SVN => 1.2
* easy: => 0
* ui_ux: => 0
* type: => Bug
Comment:
This is my very first post to Django bug system, so in case smth is
incorrect please do not beat a newbie and let me know what's wrong in this
bug submission form.
I am using Django 1.2.7.
When loading fixtures from json file I had the same issue.
First, I have loaded fixtures automatically by using syncdb. Got
ValidationError.
Second, I manually deserialized json file and got the same
ValidationError.
>>> f = open('/home/dima/djprojects/mysite/places/data/data_chunk.json',
'r')
>>> for object in serializers.deserialize('json', f):
... print object
...
<DeserializedObject: places.MenuCategory(pk=9)>
<DeserializedObject: places.MenuCategory(pk=10)>
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/usr/local/lib/python2.6/dist-
packages/django/core/serializers/json.py", line 35, in Deserializer
for obj in PythonDeserializer(simplejson.load(stream), **options):
File "/usr/local/lib/python2.6/dist-
packages/django/core/serializers/python.py", line 119, in Deserializer
value =
field.rel.to._meta.get_field(field.rel.field_name).to_python(field_value)
File "/usr/local/lib/python2.6/dist-
packages/django/db/models/fields/__init__.py", line 471, in to_python
raise exceptions.ValidationError(self.error_messages['invalid'])
ValidationError: [u'This value must be an integer.']
I have verified that my natural_key() model method is returning a tuple,
but this did not fix the bug.
class MenuCategoryManager(models.Manager):
def get_by_natural_key(self, category):
return self.get(category=category)
class MenuCategory(models.Model):
objects = MenuCategoryManager()
category = models.CharField(max_length=256)
# definition of natural keys
def natural_key(self):
return (self.category,)
Only when I added [] to the value in json file (where key was referring to
the ForeignKey relationship) the Error resolved.
So, I was get ValidationError with this json
"menu_category": "Холодные закуски и салаты",
And no ValidationError with this json
"menu_category": [
"Холодные закуски и салаты"
],
--
Ticket URL: <https://code.djangoproject.com/ticket/14438#comment:3>
Django <https://code.djangoproject.com/>
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