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from django.conf import settings
from django.core.exceptions import ValidationError
from django.core.management import BaseCommand
from django.core.management import CommandError
from django.utils.translation import gettext as _
from constance import config
from constance.forms import ConstanceForm
from constance.models import Constance
from constance.utils import get_values
def _set_constance_value(key, value):
"""
Parses and sets a Constance value from a string
:param key:
:param value:
:return:
"""
form = ConstanceForm(initial=get_values())
field = form.fields[key]
clean_value = field.clean(field.to_python(value))
setattr(config, key, clean_value)
class Command(BaseCommand):
help = _('Get/Set In-database config settings handled by Constance')
GET = 'get'
SET = 'set'
LIST = 'list'
REMOVE_STALE_KEYS = 'remove_stale_keys'
def add_arguments(self, parser):
subparsers = parser.add_subparsers(dest='command')
subparsers.add_parser(self.LIST, help='list all Constance keys and their values')
parser_get = subparsers.add_parser(self.GET, help='get the value of a Constance key')
parser_get.add_argument('key', help='name of the key to get', metavar='KEY')
parser_set = subparsers.add_parser(self.SET, help='set the value of a Constance key')
parser_set.add_argument('key', help='name of the key to set', metavar='KEY')
# use nargs='+' so that we pass a list to MultiValueField (eg SplitDateTimeField)
parser_set.add_argument('value', help='value to set', metavar='VALUE', nargs='+')
subparsers.add_parser(
self.REMOVE_STALE_KEYS,
help='delete all Constance keys and their values if they are not in settings.CONSTANCE_CONFIG (stale keys)',
)
def handle(self, command, key=None, value=None, *args, **options):
if command == self.GET:
try:
self.stdout.write(str(getattr(config, key)), ending='\n')
except AttributeError as e:
raise CommandError(f'{key} is not defined in settings.CONSTANCE_CONFIG') from e
elif command == self.SET:
try:
if len(value) == 1:
# assume that if a single argument was passed, the field doesn't expect a list
value = value[0]
_set_constance_value(key, value)
except KeyError as e:
raise CommandError(f'{key} is not defined in settings.CONSTANCE_CONFIG') from e
except ValidationError as e:
raise CommandError(', '.join(e)) from e
elif command == self.LIST:
for k, v in get_values().items():
self.stdout.write(f'{k}\t{v}', ending='\n')
elif command == self.REMOVE_STALE_KEYS:
actual_keys = settings.CONSTANCE_CONFIG.keys()
stale_records = Constance.objects.exclude(key__in=actual_keys)
if stale_records:
self.stdout.write('The following record will be deleted:', ending='\n')
else:
self.stdout.write('There are no stale records in the database.', ending='\n')
for stale_record in stale_records:
self.stdout.write(f'{stale_record.key}\t{stale_record.value}', ending='\n')
stale_records.delete()
else:
raise CommandError('Invalid command')
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