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"""
Global Django exception and warning classes.
"""
from functools import reduce
class DjangoRuntimeWarning(RuntimeWarning):
pass
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."
pass
class SuspiciousOperation(Exception):
"The user did something suspicious"
pass
class PermissionDenied(Exception):
"The user did not have permission to do that"
pass
class ViewDoesNotExist(Exception):
"The requested view does not exist"
pass
class MiddlewareNotUsed(Exception):
"This middleware is not used in this server configuration"
pass
class ImproperlyConfigured(Exception):
"Django is somehow improperly configured"
pass
class FieldError(Exception):
"""Some kind of problem with a model field."""
pass
NON_FIELD_ERRORS = '__all__'
class ValidationError(Exception):
"""An error while validating data."""
def __init__(self, message, code=None, params=None):
import operator
from django.utils.encoding import force_text
"""
ValidationError can be passed any object that can be printed (usually
a string), a list of objects or a dictionary.
"""
if isinstance(message, dict):
self.message_dict = message
# Reduce each list of messages into a single list.
message = reduce(operator.add, message.values())
if isinstance(message, list):
self.messages = [force_text(msg) for msg in message]
else:
self.code = code
self.params = params
message = force_text(message)
self.messages = [message]
def __str__(self):
# This is needed because, without a __str__(), printing an exception
# instance would result in this:
# AttributeError: ValidationError instance has no attribute 'args'
# See http://www.python.org/doc/current/tut/node10.html#handling
if hasattr(self, 'message_dict'):
return repr(self.message_dict)
return repr(self.messages)
def __repr__(self):
if hasattr(self, 'message_dict'):
return 'ValidationError(%s)' % repr(self.message_dict)
return 'ValidationError(%s)' % repr(self.messages)
def update_error_dict(self, error_dict):
if hasattr(self, 'message_dict'):
if error_dict:
for k, v in self.message_dict.items():
error_dict.setdefault(k, []).extend(v)
else:
error_dict = self.message_dict
else:
error_dict[NON_FIELD_ERRORS] = self.messages
return error_dict
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