Opened 8 years ago

Closed 7 years ago

#8412 closed (worksforme)

When there is a DateTimeField in, data saved with dumpdata cannot be reloaded using loaddata (on German Systems)

Reported by: Mark Essien <markessien@…> Owned by: nobody
Component: Core (Serialization) Version: 1.1-beta
Severity: Keywords: loaddata dumpdata DateTimeField
Cc: Triage Stage: Accepted
Has patch: no Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: UI/UX:


To recreate:

  1. Setup Django on a Windows XP system with the Time Format set to German (19/8/2008)
  1. Save the data using dumpdata > initial_data.json<br>
  1. Reload the data using loaddata initial_data.json<br>

The message appears:

Problem installing fixture 'initial_data.json': Traceback (most recent call last
  File "C:\Program Files\Python\Lib\site-packages\django\core\management\command
s\", line 108, in handle
    for obj in objects:
  File "C:\Program Files\Python\Lib\site-packages\django\core\serializers\json.p
y", line 42, in Deserializer
    for obj in PythonDeserializer(simplejson.load(stream)):
  File "C:\Program Files\Python\Lib\site-packages\django\core\serializers\python
.py", line 93, in Deserializer
    data[] = field.to_python(field_value)
  File "C:\Program Files\Python\Lib\site-packages\django\db\models\fields\__init", line 631, in to_python
    raise validators.ValidationError, _('Enter a valid date/time in YYYY-MM-DD H
H:MM format.')
ValidationError: [u'Enter a valid date/time in YYYY-MM-DD HH:MM format.']

Change History (8)

comment:1 Changed 8 years ago by Jacob

milestone: 1.1
Needs documentation: unset
Needs tests: unset
Patch needs improvement: unset
Triage Stage: UnreviewedAccepted

comment:2 Changed 8 years ago by Bob Thomas

I cannot reproduce this. DateTimeFields are always serialized to the format "%Y-%m-%d %H:%M:%S", and DateTimeField.to_python always accepts the same. The time format in Windows does not appear to affect this at all (though I'm still using English-language Windows, just with the time format changed). The exact error message in this bug no longer appears to exist, so it's clear some changes have been made here.

comment:3 Changed 8 years ago by Jacob

Resolution: worksforme
Status: newclosed

comment:4 Changed 7 years ago by Anders Er

Resolution: worksforme
Status: closedreopened
Version: SVN1.1-beta-1

I have the same issue on Ubuntu with Django 1.1 beta 1 after creating a fixture with the option --format xml. Same applies if format json is used.

Output from loaddata command:

Problem installing fixture '/tmp/mydata.xml': Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/django/core/management/commands/", line 150, in handle
    for obj in objects:
  File "/usr/lib/python2.5/site-packages/django/core/serializers/", line 131, in next
    return self._handle_object(node)
  File "/usr/lib/python2.5/site-packages/django/core/serializers/", line 176, in _handle_object
    value = field.to_python(getInnerText(field_node).strip())
  File "/usr/lib/python2.5/site-packages/django/db/models/fields/", line 565, in to_python
    _('Enter a valid date/time in YYYY-MM-DD HH:MM[:ss[.uuuuuu]] format.'))
ValidationError: Enter a valid date/time in YYYY-MM-DD HH:MM[:ss[.uuuuuu]] format.

comment:5 Changed 7 years ago by Alex Gaynor

milestone: 1.1

a) Can you please provide a reproducable test case for this? So far we've just seen a string of exceptions with no context.
b) This is not a 1.1 blocker.

comment:6 Changed 7 years ago by Karen Tracey

Information on how the dates are actually formatted in the generated fixture files would also be interesting.

Also please confirm the version you are running. From a brief check it does not appear to me that the most recent traceback posted matches up to 1.1 beta code.

comment:7 Changed 7 years ago by Anders Er

Date format in dumpfile (JSON) is " 9-04-18 06:41:57" - seems the 200 in 2009 has vanished.


{"pk": 2893, "model": "tweet.twittermessage", "fields": {"t_id": 786425719, "text": "My cool message here", "created_at": "   8-04-10 02:46:33", "user": 14349782}},

Model/custom field:

class BigIntegerField(IntegerField):
    def get_internal_type(self):
        return "BigIntegerField"

    def db_type(self):
        if settings.DATABASE_ENGINE == 'oracle':
            return 'NUMBER(19)'
            return 'bigint'

class Twitteruser(models.Model):
    username = models.CharField(max_length=20)
    verified = models.BooleanField(default=False, editable=False)

class Twittermessage(models.Model):
    t_id = BigIntegerField(null=False, blank=False, unique=True)
    user = models.ForeignKey(Twitteruser)
    created_at = models.DateTimeField()
    text = models.CharField(max_length=180)

I suspect this to have something with my custom BigIntegerField.

The dumpdata is done from a MySql DB using Django 1.1 RC 1. The loaddata is done into a Oracle DB using Django 1.1 Beta 1

comment:8 Changed 7 years ago by Anders Er

Resolution: worksforme
Status: reopenedclosed

My bad. Dates in the originale table were by some reason stored as 0009-04-05 etc. This of course caused trouble.

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