I have created two new fields on my model. Created and updated. They are
both DateTimeField objects. When I run makemigrations it asks for a fix
because there is no default value for the two fields. I have tried
datetime.now(), datetime.datetime.now(), datetime.date.today(), etc.
However, I keep getting the same error so I can't update my tables. Here is
the error I am getting:
You are trying to add a non-nullable field 'created' to chore without a
default;
we can not do that (the database needs something to populate existing rows).
Please select a fix:
1) Provide a one-off default now (will be set on all existing rows)
2) Quit, and let me add a default in models.py
Select an option: 1
Please enter the default value now, as valid Python
The datetime module is available, so you can do e.g. datetime.date.today()
>>> datetime.datetime.now
Traceback (most recent call last):
File "/Applications/PyCharm.app/helpers/pycharm/django_manage.py", line 23
, in <module>
run_module(manage_file, None, '__main__', True)
File
"/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py"
, line 176, in run_module
fname, loader, pkg_name)
File
"/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py"
, line 82, in _run_module_code
mod_name, mod_fname, mod_loader, pkg_name)
File
"/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py"
, line 72, in _run_code
exec code in run_globals
File "...manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "...lib/python2.7/site-packages/django/core/management/__init__.py",
line 385, in execute_from_command_line
utility.execute()
File "...lib/python2.7/site-packages/django/core/management/__init__.py",
line 377, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "...lib/python2.7/site-packages/django/core/management/base.py",
line 288, in run_from_argv
self.execute(*args, **options.__dict__)
File "...lib/python2.7/site-packages/django/core/management/base.py",
line 337, in execute
output = self.handle(*args, **options)
File
"...lib/python2.7/site-packages/django/core/management/commands/makemigrations.py"
, line 111, in handle
convert_apps=app_labels or None,
File "...lib/python2.7/site-packages/django/db/migrations/autodetector.py"
, line 50, in changes
changes = self._detect_changes(convert_apps, graph)
File "...lib/python2.7/site-packages/django/db/migrations/autodetector.py"
, line 180, in _detect_changes
self.generate_added_fields()
File "...lib/python2.7/site-packages/django/db/migrations/autodetector.py"
, line 720, in generate_added_fields
field.default = self.questioner.ask_not_null_addition(field_name,
model_name)
File "...lib/python2.7/site-packages/django/db/migrations/questioner.py",
line 119, in ask_not_null_addition
code = input(">>> ").decode(sys.stdin.encoding)
TypeError: decode() argument 1 must be string, not None
Any ideas how to make this work?
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