id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
24170	DateTimeRangeField: widget doesn't implement decompress()	Joel Burton	Ng Zhi An	"1. Create a model with a DateTimeRangeField and another field (I used just one other, a SlugField)

2. Via the admin, add a record with a valid slug and datetimerange

3. Try to edit the record, changing the slug

(This was done with a Postgres backend)

This traceback is produced:

{{{
Environment:


Request Method: POST
Request URL: http://localhost:8000/admin/homework/homework/3/

Django Version: 1.8a1
Python Version: 3.4.2
Installed Applications:
('django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'django.contrib.postgres',
 'homework')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'django.middleware.security.SecurityMiddleware')


Traceback:
File ""/Users/joel/programming/django18play/venv/lib/python3.4/site-packages/django/core/handlers/base.py"" in get_response
  131.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File ""/Users/joel/programming/django18play/venv/lib/python3.4/site-packages/django/contrib/admin/options.py"" in wrapper
  615.                 return self.admin_site.admin_view(view)(*args, **kwargs)
File ""/Users/joel/programming/django18play/venv/lib/python3.4/site-packages/django/utils/decorators.py"" in _wrapped_view
  110.                     response = view_func(request, *args, **kwargs)
File ""/Users/joel/programming/django18play/venv/lib/python3.4/site-packages/django/views/decorators/cache.py"" in _wrapped_view_func
  54.         response = view_func(request, *args, **kwargs)
File ""/Users/joel/programming/django18play/venv/lib/python3.4/site-packages/django/contrib/admin/sites.py"" in inner
  226.             return view(request, *args, **kwargs)
File ""/Users/joel/programming/django18play/venv/lib/python3.4/site-packages/django/contrib/admin/options.py"" in change_view
  1518.         return self.changeform_view(request, object_id, form_url, extra_context)
File ""/Users/joel/programming/django18play/venv/lib/python3.4/site-packages/django/utils/decorators.py"" in _wrapper
  34.             return bound_func(*args, **kwargs)
File ""/Users/joel/programming/django18play/venv/lib/python3.4/site-packages/django/utils/decorators.py"" in _wrapped_view
  110.                     response = view_func(request, *args, **kwargs)
File ""/Users/joel/programming/django18play/venv/lib/python3.4/site-packages/django/utils/decorators.py"" in bound_func
  30.                 return func.__get__(self, type(self))(*args2, **kwargs2)
File ""/opt/local/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/contextlib.py"" in inner
  30.                 return func(*args, **kwds)
File ""/Users/joel/programming/django18play/venv/lib/python3.4/site-packages/django/contrib/admin/options.py"" in changeform_view
  1472.                     change_message = self.construct_change_message(request, form, formsets)
File ""/Users/joel/programming/django18play/venv/lib/python3.4/site-packages/django/contrib/admin/options.py"" in construct_change_message
  1020.         if form.changed_data:
File ""/Users/joel/programming/django18play/venv/lib/python3.4/site-packages/django/forms/forms.py"" in changed_data
  466.                 if field.has_changed(initial_value, data_value):
File ""/Users/joel/programming/django18play/venv/lib/python3.4/site-packages/django/forms/fields.py"" in has_changed
  1126.                 initial = self.widget.decompress(initial)
File ""/Users/joel/programming/django18play/venv/lib/python3.4/site-packages/django/forms/widgets.py"" in decompress
  850.         raise NotImplementedError('Subclasses must implement this method.')

Exception Type: NotImplementedError at /admin/homework/homework/3/
Exception Value: Subclasses must implement this method.
}}}"	Cleanup/optimization	closed	Database layer (models, ORM)	1.8alpha1	Normal	fixed	DateTimeRangeField decompress		Ready for checkin	1	0	0	0	0	0