Django raises some of its own exceptions as well as standard Python exceptions.
Django core exception classes are defined in django.core.exceptions
.
AppRegistryNotReady
AppRegistryNotReady
[源代码]
ObjectDoesNotExist
ObjectDoesNotExist
[源代码]The base class for Model.DoesNotExist
exceptions. A try/except
for
ObjectDoesNotExist
will catch
DoesNotExist
exceptions for all models.
See get()
.
EmptyResultSet
EmptyResultSet
[源代码]EmptyResultSet
may be raised during query generation if a query won't return any results. Most Django projects won't encounter this exception, but it might be useful for implementing custom lookups and expressions.
FieldDoesNotExist
FieldDoesNotExist
[源代码]FieldDoesNotExist
exception is raised by a model's _meta.get_field()
method when the requested field does not exist on the model or on the model's parents.
MultipleObjectsReturned
MultipleObjectsReturned
[源代码]The base class for Model.MultipleObjectsReturned
exceptions. A
try/except
for MultipleObjectsReturned
will catch
MultipleObjectsReturned
exceptions for all
models.
See get()
.
SuspiciousOperation
SuspiciousOperation
[源代码]The SuspiciousOperation
exception is raised when a user has
performed an operation that should be considered suspicious from a security
perspective, such as tampering with a session cookie. Subclasses of
SuspiciousOperation
include:
DisallowedHost
DisallowedModelAdminLookup
DisallowedModelAdminToField
DisallowedRedirect
InvalidSessionKey
RequestDataTooBig
SuspiciousFileOperation
SuspiciousMultipartForm
SuspiciousSession
TooManyFieldsSent
If a SuspiciousOperation
exception reaches the ASGI/WSGI handler level
it is logged at the Error
level and results in
a HttpResponseBadRequest
. See the logging
documentation for more information.
PermissionDenied
PermissionDenied
[源代码]PermissionDenied
exception is raised when a user does not have permission to perform the action requested.
ViewDoesNotExist
ViewDoesNotExist
[源代码]ViewDoesNotExist
exception is raised by django.urls
when a requested view does not exist.
MiddlewareNotUsed
MiddlewareNotUsed
[源代码]MiddlewareNotUsed
exception is raised when a middleware is not used in the server configuration.
ImproperlyConfigured
ImproperlyConfigured
[源代码]ImproperlyConfigured
exception is raised when Django is somehow improperly configured -- for example, if a value in settings.py
is incorrect or unparseable.
FieldError
FieldError
[源代码]FieldError
exception is raised when there is a problem with a model field. This can happen for several reasons:
ValidationError
ValidationError
[源代码]ValidationError
exception is raised when data fails form or model field validation. For more information about validation, see Form and Field Validation, Model Field Validation and the Validator Reference.NON_FIELD_ERRORS
NON_FIELD_ERRORS
ValidationError
s that don't belong to a particular field in a form
or model are classified as NON_FIELD_ERRORS
. This constant is used
as a key in dictionaries that otherwise map fields to their respective
list of errors.
RequestAborted
RequestAborted
[源代码]
The RequestAborted
exception is raised when a HTTP body being read
in by the handler is cut off midstream and the client connection closes,
or when the client does not send data and hits a timeout where the server
closes the connection.
It is internal to the HTTP handler modules and you are unlikely to see it elsewhere. If you are modifying HTTP handling code, you should raise this when you encounter an aborted request to make sure the socket is closed cleanly.
SynchronousOnlyOperation
SynchronousOnlyOperation
[源代码]
The SynchronousOnlyOperation
exception is raised when code that
is only allowed in synchronous Python code is called from an asynchronous
context (a thread with a running asynchronous event loop). These parts of
Django are generally heavily reliant on thread-safety to function and don't
work correctly under coroutines sharing the same thread.
If you are trying to call code that is synchronous-only from an
asynchronous thread, then create a synchronous thread and call it in that.
You can accomplish this is with asgiref.sync.sync_to_async()
.
URL Resolver exceptions are defined in django.urls
.
Resolver404
Resolver404
Resolver404
exception is raised by resolve()
if the path passed to resolve()
doesn't map to a view. It's a subclass of django.http.Http404
.
NoReverseMatch
NoReverseMatch
NoReverseMatch
exception is raised by django.urls
when a matching URL in your URLconf cannot be identified based on the parameters supplied.
Database exceptions may be imported from django.db
.
Django wraps the standard database exceptions so that your Django code has a guaranteed common implementation of these classes.
Error
InterfaceError
DatabaseError
DataError
OperationalError
IntegrityError
InternalError
ProgrammingError
NotSupportedError
The Django wrappers for database exceptions behave exactly the same as the underlying database exceptions. See PEP 249, the Python Database API Specification v2.0, for further information.
As per PEP 3134, a __cause__
attribute is set with the original
(underlying) database exception, allowing access to any additional
information provided.
models.
ProtectedError
Raised to prevent deletion of referenced objects when using
django.db.models.PROTECT
. models.ProtectedError
is a subclass
of IntegrityError
.
models.
RestrictedError
Raised to prevent deletion of referenced objects when using
django.db.models.RESTRICT
. models.RestrictedError
is a subclass
of IntegrityError
.
Http exceptions may be imported from django.http
.
UnreadablePostError
UnreadablePostError
UnreadablePostError
is raised when a user cancels an upload.
Transaction exceptions are defined in django.db.transaction
.
TransactionManagementError
TransactionManagementError
TransactionManagementError
is raised for any and all problems related to database transactions.
Exceptions provided by the django.test
package.
RedirectCycleError
client.
RedirectCycleError
RedirectCycleError
is raised when the test client detects a loop or an overly long chain of redirects.
Django raises built-in Python exceptions when appropriate as well. See the Python documentation for further information on the bltin-exceptions.