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from __future__ import unicode_literals
from django.core.exceptions import ValidationError
from django.utils.functional import SimpleLazyObject
from django.utils.translation import string_concat
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 `string_concat` does. For example, proxied
# ungettext calls require a count parameter and are converted
# to an empty string if they are missing it.
message=string_concat(
SimpleLazyObject(lambda: prefix % params),
SimpleLazyObject(lambda: error.message % error_params),
),
code=code,
params=dict(error_params, **params),
)
return ValidationError([
prefix_validation_error(e, prefix, code, params) for e in error.error_list
])
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