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from django.apps import apps
from django.core import checks
from django.core.exceptions import ValidationError
from django.utils.functional import SimpleLazyObject
from django.utils.text import format_lazy
def prefix_validation_error(error, prefix, code, params):
"""
Prefix a validation error message while maintaining the existing
validation data structure.
"""
if error.error_list == [error]:
error_params = error.params or {}
return ValidationError(
# We can't simply concatenate messages since they might require
# their associated parameters to be expressed correctly which
# is not something `format_lazy` does. For example, proxied
# ngettext calls require a count parameter and are converted
# to an empty string if they are missing it.
message=format_lazy(
"{} {}",
SimpleLazyObject(lambda: prefix % params),
SimpleLazyObject(lambda: error.message % error_params),
),
code=code,
params={**error_params, **params},
)
return ValidationError(
[prefix_validation_error(e, prefix, code, params) for e in error.error_list]
)
class CheckPostgresInstalledMixin:
def _check_postgres_installed(self, *args):
# When subclassed by Index or BaseConstraint subclasses, args is
# (model, connection).
obj = args[0] if args else self
if not apps.is_installed("django.contrib.postgres"):
return [
checks.Error(
"'django.contrib.postgres' must be in INSTALLED_APPS in "
"order to use %s." % self.__class__.__name__,
obj=obj,
id="postgres.E005",
)
]
return []
def check(self, *args, **kwargs):
errors = super().check(*args, **kwargs)
errors.extend(self._check_postgres_installed(*args))
return errors
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