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- 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
- ])
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