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import copy
from django.core.exceptions import ValidationError
from django.core.validators import (
MaxLengthValidator, MaxValueValidator, MinLengthValidator,
MinValueValidator,
)
from django.utils.deconstruct import deconstructible
from django.utils.translation import ugettext_lazy as _, ungettext_lazy
class ArrayMaxLengthValidator(MaxLengthValidator):
message = ungettext_lazy(
'List contains %(show_value)d item, it should contain no more than %(limit_value)d.',
'List contains %(show_value)d items, it should contain no more than %(limit_value)d.',
'limit_value')
class ArrayMinLengthValidator(MinLengthValidator):
message = ungettext_lazy(
'List contains %(show_value)d item, it should contain no fewer than %(limit_value)d.',
'List contains %(show_value)d items, it should contain no fewer than %(limit_value)d.',
'limit_value')
@deconstructible
class KeysValidator(object):
"""A validator designed for HStore to require/restrict keys."""
messages = {
'missing_keys': _('Some keys were missing: %(keys)s'),
'extra_keys': _('Some unknown keys were provided: %(keys)s'),
}
strict = False
def __init__(self, keys, strict=False, messages=None):
self.keys = set(keys)
self.strict = strict
if messages is not None:
self.messages = copy.copy(self.messages)
self.messages.update(messages)
def __call__(self, value):
keys = set(value.keys())
missing_keys = self.keys - keys
if missing_keys:
raise ValidationError(self.messages['missing_keys'],
code='missing_keys',
params={'keys': ', '.join(missing_keys)},
)
if self.strict:
extra_keys = keys - self.keys
if extra_keys:
raise ValidationError(self.messages['extra_keys'],
code='extra_keys',
params={'keys': ', '.join(extra_keys)},
)
def __eq__(self, other):
return (
isinstance(other, self.__class__)
and (self.keys == other.keys)
and (self.messages == other.messages)
and (self.strict == other.strict)
)
def __ne__(self, other):
return not (self == other)
class RangeMaxValueValidator(MaxValueValidator):
compare = lambda self, a, b: a.upper > b
message = _('Ensure that this range is completely less than or equal to %(limit_value)s.')
class RangeMinValueValidator(MinValueValidator):
compare = lambda self, a, b: a.lower < b
message = _('Ensure that this range is completely greater than or equal to %(limit_value)s.')
|