#21075: django crashes with sys.exit(1) when management.call_command is used
with
unittest
--------------------------------------+--------------------
Reporter: nahumoz@… | Owner: nobody
Type: Bug | Status: new
Component: Core (Serialization) | Version: 1.5
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
--------------------------------------+--------------------
Hi Everyone,
I would like to created a backup of my models when new model elements are
created, therefore I
defined in my `models.py` the following function:
{{{
def save_models_as_json(**kwargs):
with open(JSON_DATA_FILE, 'w') as j:
management.call_command('dumpdata', 'TimePortal',
indent=4, stdout=j)
# later in my models file I register it with:
post_save.connect(save_models_as_json, sender=Employee)
}}}
The above command is working perfectly fine when I use the admin GUI I
find
inside the `JSON_DATA_FILE` all my relevand information from my
application
TimePortal.
This function also works fine when running unit tests with:
{{{
$ python mange test TimePortal
}}}
Things get ugly when I want the dumpdata command to include some more
arguments, e.g:
{{{
def save_models_as_json(**kwargs):
with open(JSON_DATA_FILE, 'w') as j:
management.call_command('dumpdata', 'TimePortal', '--natural'
indent=4, stdout=j)
}}}
or:
{{{
def save_models_as_json(**kwargs):
with open(JSON_DATA_FILE, 'w') as j:
management.call_command('dumpdata', 'TimePortal', '-e',
'contenttypes',
indent=4, stdout=j)
}}}
When I run my unit tests, django will crash, with either:
{{{
$ python ../manage.py test TimePortal
Creating test database for alias 'default'...
........Error: Unknown application: --natural
E............
======================================================================
ERROR: test_customer_has_employee (TimePortal.test_models.TestModels)
----------------------------------------------------------------------
Traceback (most recent call last):
File
"/home/ozn/software/zeitport/zeitportal/TimePortal/test_models.py", line
18, in setUp
worksfor=self.customer)
File "/usr/local/lib/python2.7/dist-
packages/django/db/models/manager.py", line 134, in get_or_create
return self.get_query_set().get_or_create(**kwargs)
File "/usr/local/lib/python2.7/dist-
packages/django/db/models/query.py", line 452, in get_or_create
obj.save(force_insert=True, using=self.db)
File "/usr/local/lib/python2.7/dist-
packages/django/db/models/base.py", line 463, in save
self.save_base(using=using, force_insert=force_insert,
force_update=force_update)
File "/usr/local/lib/python2.7/dist-
packages/django/db/models/base.py", line 565, in save_base
created=(not record_exists), raw=raw, using=using)
File "/usr/local/lib/python2.7/dist-
packages/django/dispatch/dispatcher.py", line 172, in send
response = receiver(signal=self, sender=sender, **named)
File "/home/ozn/software/zeitport/zeitportal/TimePortal/models.py",
line 61, in save_models_as_json
'dumpdata', '--natural', 'TimePortal', indent=4, stdout=j)
File "/usr/local/lib/python2.7/dist-
packages/django/core/management/__init__.py", line 150, in call_command
return klass.execute(*args, **defaults)
File "/usr/local/lib/python2.7/dist-
packages/django/core/management/base.py", line 249, in execute
sys.exit(1)
SystemExit: 1
----------------------------------------------------------------------
Ran 21 tests in 0.017s
FAILED (errors=1)
Destroying test database for alias 'default'...
}}}
or with
{{{
$ python ../manage.py test TimePortal
Creating test database for alias 'default'...
........Error: Unknown application: -e
E............
======================================================================
... chopped for sanity ...
File "/usr/local/lib/python2.7/dist-
packages/django/core/management/__init__.py", line 150, in call_command
return klass.execute(*args, **defaults)
File "/usr/local/lib/python2.7/dist-
packages/django/core/management/base.py", line 249, in execute
sys.exit(1)
SystemExit: 1
----------------------------------------------------------------------
Ran 21 tests in 0.017s
FAILED (errors=1)
Destroying test database for alias 'default'...
}}}
Thanks for the excellent django documentation, I found out I could
acchieve
the desired serialization without using `management.call_command`:
{{{
from django.core import serializers
JSONSerializer = serializers.get_serializer('json')
json_serializer = JSONSerializer()
def save_models_as_json(**kwargs):
with open(JSON_DATA_FILE, 'w') as j:
json_serializer.serialize(list(Employee.objects.all())
+ list(Customer.objects.all())
+list(Rules.objects.all())
+ list(Account.objects.all()),
indent=4, use_natural_keys=True)
j.writelines(json_serializer.getvalue())
}}}
despite the above 'solution', I think this is worth the attention of the
developers, since it might give a hint for some problem with
management.call_command.
I am using django 1.5.2 and Python 2.7.5.
I also tested this with Python 2.6.8 and django 1.4.5
Thanks for reading so far. Hopefully, you can find a good explanation to
this behavior with multiple options passed to `management.call_command`.
--
Ticket URL: <https://code.djangoproject.com/ticket/21075>
Django <https://code.djangoproject.com/>
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