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Global Django exception and warning classes.
from django.utils import six
from django.utils.encoding import force_text
class FieldDoesNotExist(Exception):
"""The requested model field does not exist"""
class DjangoRuntimeWarning(RuntimeWarning):
class AppRegistryNotReady(Exception):
"""The django.apps registry is not populated yet"""
class ObjectDoesNotExist(Exception):
"""The requested object does not exist"""
silent_variable_failure = True
class MultipleObjectsReturned(Exception):
"""The query returned multiple objects when only one was expected."""
class SuspiciousOperation(Exception):
"""The user did something suspicious"""
class SuspiciousMultipartForm(SuspiciousOperation):
"""Suspect MIME request in multipart form data"""
class SuspiciousFileOperation(SuspiciousOperation):
"""A Suspicious filesystem operation was attempted"""
class DisallowedHost(SuspiciousOperation):
"""HTTP_HOST header contains invalid value"""
class DisallowedRedirect(SuspiciousOperation):
"""Redirect to scheme not in allowed list"""
class PermissionDenied(Exception):
"""The user did not have permission to do that"""
class ViewDoesNotExist(Exception):
"""The requested view does not exist"""
class MiddlewareNotUsed(Exception):
"""This middleware is not used in this server configuration"""
class ImproperlyConfigured(Exception):
"""Django is somehow improperly configured"""
class FieldError(Exception):
"""Some kind of problem with a model field."""
NON_FIELD_ERRORS = '__all__'
class ValidationError(Exception):
"""An error while validating data."""
def __init__(self, message, code=None, params=None):
The `message` argument can be a single error, a list of errors, or a
dictionary that maps field names to lists of errors. What we define as
an "error" can be either a simple string or an instance of
ValidationError with its message attribute set, and what we define as
list or dictionary can be an actual `list` or `dict` or an instance
of ValidationError with its `error_list` or `error_dict` attribute set.
# PY2 can't pickle naive exception:
super(ValidationError, self).__init__(message, code, params)
if isinstance(message, ValidationError):
if hasattr(message, 'error_dict'):
message = message.error_dict
# PY2 has a `message` property which is always there so we can't
# duck-type on it. It was introduced in Python 2.5 and already
# deprecated in Python 2.6.
elif not hasattr(message, 'message' if six.PY3 else 'code'):
message = message.error_list
message, code, params = message.message, message.code, message.params
if isinstance(message, dict):
self.error_dict = {}
for field, messages in message.items():
if not isinstance(messages, ValidationError):
messages = ValidationError(messages)
self.error_dict[field] = messages.error_list
elif isinstance(message, list):
self.error_list = []
for message in message:
# Normalize plain strings to instances of ValidationError.
if not isinstance(message, ValidationError):
message = ValidationError(message)
if hasattr(message, 'error_dict'):
self.error_list.extend(sum(message.error_dict.values(), []))
self.message = message
self.code = code
self.params = params
self.error_list = [self]
def message_dict(self):
# Trigger an AttributeError if this ValidationError
# doesn't have an error_dict.
getattr(self, 'error_dict')
return dict(self)
def messages(self):
if hasattr(self, 'error_dict'):
return sum(dict(self).values(), [])
return list(self)
def update_error_dict(self, error_dict):
if hasattr(self, 'error_dict'):
for field, error_list in self.error_dict.items():
error_dict.setdefault(field, []).extend(error_list)
error_dict.setdefault(NON_FIELD_ERRORS, []).extend(self.error_list)
return error_dict
def __iter__(self):
if hasattr(self, 'error_dict'):
for field, errors in self.error_dict.items():
yield field, list(ValidationError(errors))
for error in self.error_list:
message = error.message
if error.params:
message %= error.params
yield force_text(message)
def __str__(self):
if hasattr(self, 'error_dict'):
return repr(dict(self))
return repr(list(self))
def __repr__(self):
return 'ValidationError(%s)' % self
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