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from django.conf import settings
from django.core.checks import Error
from django.core.exceptions import ValidationError
def check_site_id(app_configs, **kwargs):
# Inner import avoids AppRegistryNotReady
from django.contrib.sites.models import Site
if hasattr(settings, "SITE_ID"):
try:
site_id = Site._meta.pk.to_python(settings.SITE_ID)
except ValidationError as exc:
return [
Error(
f"The SITE_ID setting failed to validate: {exc}.", id="sites.E101"
),
]
else:
# to_python() might coerce a SITE_ID of the wrong type to the valid
# type, e.g. "1" to 1 for AutoField.
if site_id != settings.SITE_ID:
expected_type = type(site_id).__name__
return [
Error(
f"The SITE_ID setting must be of type {expected_type}.",
id="sites.E101",
),
]
return []
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