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
29738	Django can't serialize DateTimeTZRange(lower=None, upper=None, bounds='[)')	Graham Mayer	nobody	"Tried to use {{{DateTimeTZRange(lower=None, upper=None, bounds='[)')}}} as a default for a model field and get the following error when running {{{python manage.py makemigrations}}}:

{{{
 Traceback (most recent call last):
  File ""manage.py"", line 12, in <module>
    execute_from_command_line(sys.argv)
  File ""/home/grahammayer/logimeter/logimeter/lib/python3.6/site-packages/django/core/management/__init__.py"", line 371, in execute_from_command_line
    utility.execute()
  File ""/home/grahammayer/logimeter/logimeter/lib/python3.6/site-packages/django/core/management/__init__.py"", line 365, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File ""/home/grahammayer/logimeter/logimeter/lib/python3.6/site-packages/django/core/management/base.py"", line 288, in run_from_argv
    self.execute(*args, **cmd_options)
  File ""/home/grahammayer/logimeter/logimeter/lib/python3.6/site-packages/django/core/management/base.py"", line 335, in execute
    output = self.handle(*args, **options)
  File ""/home/grahammayer/logimeter/logimeter/lib/python3.6/site-packages/django/core/management/commands/makemigrations.py"", line 172, in handle
    self.write_migration_files(changes)
  File ""/home/grahammayer/logimeter/logimeter/lib/python3.6/site-packages/django/core/management/commands/makemigrations.py"", line 210, in write_migration_files
    migration_string = writer.as_string()
  File ""/home/grahammayer/logimeter/logimeter/lib/python3.6/site-packages/django/db/migrations/writer.py"", line 151, in as_string
    operation_string, operation_imports = OperationWriter(operation).serialize()
  File ""/home/grahammayer/logimeter/logimeter/lib/python3.6/site-packages/django/db/migrations/writer.py"", line 110, in serialize
    _write(arg_name, arg_value)
  File ""/home/grahammayer/logimeter/logimeter/lib/python3.6/site-packages/django/db/migrations/writer.py"", line 74, in _write
    arg_string, arg_imports = MigrationWriter.serialize(_arg_value)
  File ""/home/grahammayer/logimeter/logimeter/lib/python3.6/site-packages/django/db/migrations/writer.py"", line 279, in serialize
    return serializer_factory(value).serialize()
  File ""/home/grahammayer/logimeter/logimeter/lib/python3.6/site-packages/django/db/migrations/serializer.py"", line 203, in serialize
    return self.serialize_deconstructed(path, args, kwargs)
  File ""/home/grahammayer/logimeter/logimeter/lib/python3.6/site-packages/django/db/migrations/serializer.py"", line 90, in serialize_deconstructed
    arg_string, arg_imports = serializer_factory(arg).serialize()
  File ""/home/grahammayer/logimeter/logimeter/lib/python3.6/site-packages/django/db/migrations/serializer.py"", line 370, in serializer_factory
    ""topics/migrations/#migration-serializing"" % (value, get_docs_version())
ValueError: Cannot serialize: DateTimeTZRange(None, None, '[)')
}}}"	Bug	new	contrib.postgres	2.0	Normal		rangefield, postgresql, psycopg2, migrations		Accepted	0	1	1	0	1	0