I try to create a custom model field, that should "Converting values to Python
objects" as described in the documentation here:
<https://docs.djangoproject.com/en/dev/howto/custom-model-fields/#converting-values-to-python-objects>
It doesn't work with Python 2.7 and 3.4 with Django 1.7.x and 1.8.x...
I search around and found no unittest case for this "howto/custom-model-fields"
So i created a simple test case to investigate why my code not worked.
I made a unittest against "stable/1.7.x", "stable/1.8.x" and "master" here:
https://github.com/jedie/django/branches/yours
compare links:
stable/1.7.x
<https://github.com/jedie/django/compare/stable/1.7.x...test_custom_model_fields_1.7.x>
stable/1.8.x
<https://github.com/jedie/django/compare/stable/1.8.x...test_custom_model_fields_1.8.x>
master
<https://github.com/jedie/django/compare/master...test_custom_model_fields_master>
I run these test and here the result:
*** 1.7.x with Py2:
test_custom_model_field (custom_model_fields.tests.TestModel1Tests) ... FAIL
test_values (custom_model_fields.tests.TestModel1Tests) ... FAIL
test_custom_model_field (custom_model_fields.tests.TestModel2Tests) ... ok
test_values (custom_model_fields.tests.TestModel2Tests) ... FAIL
*** 1.7.x with Py3:
test_custom_model_field (custom_model_fields.tests.TestModel1Tests) ... FAIL
test_values (custom_model_fields.tests.TestModel1Tests) ... FAIL
test_custom_model_field (custom_model_fields.tests.TestModel2Tests) ... FAIL
test_values (custom_model_fields.tests.TestModel2Tests) ... FAIL
*** 1.8.x with Py2:
test_custom_model_field (custom_model_fields.tests.TestModel1Tests) ... ok
test_values (custom_model_fields.tests.TestModel1Tests) ... ok
*** 1.8.x with Py3
test_custom_model_field (custom_model_fields.tests.TestModel1Tests) ... ok
test_values (custom_model_fields.tests.TestModel1Tests) ... ok
*** master with Py2 - doesn't run:
Traceback (most recent call last):
File "/home/jens/PyLucid_env/src/django/tests/runtests.py", line 12, in
<module>
from django.apps import apps
File "/home/jens/PyLucid_env/src/django/django/apps/__init__.py", line 1, in
<module>
from .config import AppConfig # NOQA
File "/home/jens/PyLucid_env/src/django/django/apps/config.py", line 6, in
<module>
from django.utils.module_loading import module_has_submodule
File "/home/jens/PyLucid_env/src/django/django/utils/module_loading.py", line
4, in <module>
from importlib import import_module
File "/home/jens/PyLucid_env/src/django/django/utils/importlib.py", line 6,
in <module>
ImportError: cannot import name RemovedInDjango19Warning
*** master with Py3:
test_custom_model_field (custom_model_fields.tests.TestModel1Tests) ... ok
test_values (custom_model_fields.tests.TestModel1Tests) ... ok
test_custom_model_field (custom_model_fields.tests.TestModel2Tests) ... ok
test_values (custom_model_fields.tests.TestModel2Tests) ... ok
So the biggest problem is django 1.7.x...
But it should work in the same way:
<https://docs.djangoproject.com/en/1.7/howto/custom-model-fields/#converting-database-values-to-python-objects>
With 1.8.x i must remove the test with existing:
__metaclass__ = models.SubfieldBase
Otherwise the test will not run:
Testing against Django installed in '/home/jens/PyLucid_env/src/django/django'
Importing application custom_model_fields
Traceback (most recent call last):
File "/home/jens/PyLucid_env/src/django/tests/runtests.py", line 448, in
<module>
options.debug_sql)
File "/home/jens/PyLucid_env/src/django/tests/runtests.py", line 235, in
django_tests
state = setup(verbosity, test_labels)
File "/home/jens/PyLucid_env/src/django/tests/runtests.py", line 214, in setup
apps.set_installed_apps(settings.INSTALLED_APPS)
File "/home/jens/PyLucid_env/src/django/django/apps/registry.py", line 324,
in set_installed_apps
self.populate(installed)
File "/home/jens/PyLucid_env/src/django/django/apps/registry.py", line 108,
in populate
app_config.import_models(all_models)
File "/home/jens/PyLucid_env/src/django/django/apps/config.py", line 198, in
import_models
self.models_module = import_module(models_module_name)
File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
__import__(name)
File "/home/jens/PyLucid_env/src/django/tests/custom_model_fields/models.py",
line 41, in <module>
class CommaSeparatedModelField2(CommaSeparatedModelField1):
File
"/home/jens/PyLucid_env/src/django/django/db/models/fields/subclassing.py", line
22, in __new__
RemovedInDjango20Warning)
django.utils.deprecation.RemovedInDjango20Warning: SubfieldBase has been
deprecated. Use Field.from_db_value instead.
Maybe i miss something to handle warnings with tests, but didn't find something
about warnings here:
https://docs.djangoproject.com/en/dev/internals/contributing/writing-code/unit-tests/
--
Mfg.
Jens Diemer
----
http://www.jensdiemer.de
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