"""
Global Django exception and warning classes.
"""
[文档]class FieldDoesNotExist(Exception):
"""The requested model field does not exist"""
pass
[文档]class AppRegistryNotReady(Exception):
"""The django.apps registry is not populated yet"""
pass
[文档]class ObjectDoesNotExist(Exception):
"""The requested object does not exist"""
silent_variable_failure = True
[文档]class MultipleObjectsReturned(Exception):
"""The query returned multiple objects when only one was expected."""
pass
[文档]class SuspiciousOperation(Exception):
"""The user did something suspicious"""
class SuspiciousMultipartForm(SuspiciousOperation):
"""Suspect MIME request in multipart form data"""
pass
class SuspiciousFileOperation(SuspiciousOperation):
"""A Suspicious filesystem operation was attempted"""
pass
class DisallowedHost(SuspiciousOperation):
"""HTTP_HOST header contains invalid value"""
pass
class DisallowedRedirect(SuspiciousOperation):
"""Redirect to scheme not in allowed list"""
pass
class TooManyFieldsSent(SuspiciousOperation):
"""
The number of fields in a GET or POST request exceeded
settings.DATA_UPLOAD_MAX_NUMBER_FIELDS.
"""
pass
class RequestDataTooBig(SuspiciousOperation):
"""
The size of the request (excluding any file uploads) exceeded
settings.DATA_UPLOAD_MAX_MEMORY_SIZE.
"""
pass
[文档]class PermissionDenied(Exception):
"""The user did not have permission to do that"""
pass
[文档]class ViewDoesNotExist(Exception):
"""The requested view does not exist"""
pass
[文档]class MiddlewareNotUsed(Exception):
"""This middleware is not used in this server configuration"""
pass
[文档]class ImproperlyConfigured(Exception):
"""Django is somehow improperly configured"""
pass
[文档]class FieldError(Exception):
"""Some kind of problem with a model field."""
pass
NON_FIELD_ERRORS = '__all__'
[文档]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.
"""
super().__init__(message, code, params)
if isinstance(message, ValidationError):
if hasattr(message, 'error_dict'):
message = message.error_dict
elif not hasattr(message, 'message'):
message = message.error_list
else:
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(), []))
else:
self.error_list.extend(message.error_list)
else:
self.message = message
self.code = code
self.params = params
self.error_list = [self]
@property
def message_dict(self):
# Trigger an AttributeError if this ValidationError
# doesn't have an error_dict.
getattr(self, 'error_dict')
return dict(self)
@property
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)
else:
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))
else:
for error in self.error_list:
message = error.message
if error.params:
message %= error.params
yield str(message)
def __str__(self):
if hasattr(self, 'error_dict'):
return repr(dict(self))
return repr(list(self))
def __repr__(self):
return 'ValidationError(%s)' % self
[文档]class EmptyResultSet(Exception):
"""A database query predicate is impossible."""
pass
