| 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] | |
| ) | |