Django raises some of its own exceptions as well as standard Python exceptions.
Django core exception classes are defined in django.core.exceptions.
AppRegistryNotReadyPAppRegistryNotReady[源代码]PThis exception is raised when attempting to use models before the app loading process, which initializes the ORM, is complete.
ObjectDoesNotExistPObjectDoesNotExist[源代码]PThe base class for DoesNotExist exceptions;
a try/except for ObjectDoesNotExist will catch
DoesNotExist exceptions for all models.
See get() for further information
on ObjectDoesNotExist and DoesNotExist.
EmptyResultSetPFieldDoesNotExistPMultipleObjectsReturnedPMultipleObjectsReturned[源代码]PThe MultipleObjectsReturned exception is raised by a query if only
one object is expected, but multiple objects are returned. A base version
of this exception is provided in django.core.exceptions; each model
class contains a subclassed version that can be used to identify the
specific object type that has returned multiple objects.
See get() for further information.
SuspiciousOperationPSuspiciousOperation[源代码]PThe 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:
DisallowedHostDisallowedModelAdminLookupDisallowedModelAdminToFieldDisallowedRedirectInvalidSessionKeyRequestDataTooBigSuspiciousFileOperationSuspiciousMultipartFormSuspiciousSessionTooManyFieldsSentIf a SuspiciousOperation exception reaches the WSGI handler level it is
logged at the Error level and results in
a HttpResponseBadRequest. See the logging
documentation for more information.
PermissionDeniedPPermissionDenied[源代码]PThe PermissionDenied exception is raised when a user does not have
permission to perform the action requested.
ViewDoesNotExistPViewDoesNotExist[源代码]PThe ViewDoesNotExist exception is raised by
django.urls when a requested view does not exist.
MiddlewareNotUsedPMiddlewareNotUsed[源代码]PThe MiddlewareNotUsed exception is raised when a middleware is not
used in the server configuration.
ImproperlyConfiguredPImproperlyConfigured[源代码]PThe ImproperlyConfigured exception is raised when Django is
somehow improperly configured -- for example, if a value in settings.py
is incorrect or unparseable.
FieldErrorPFieldError[源代码]PThe FieldError exception is raised when there is a problem with a
model field. This can happen for several reasons:
ValidationErrorPValidationError[源代码]PThe 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.
URL Resolver exceptions are defined in django.urls.
Resolver404PResolver404[源代码]PThe 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.
NoReverseMatchPNoReverseMatch[源代码]PThe 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.
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.ProtectedErrorPRaised to prevent deletion of referenced objects when using
django.db.models.PROTECT. models.ProtectedError is a subclass
of IntegrityError.
Http exceptions may be imported from django.http.
UnreadablePostErrorPUnreadablePostError[源代码]PUnreadablePostError is raised when a user cancels an upload.
Transaction exceptions are defined in django.db.transaction.
TransactionManagementErrorPTransactionManagementError[源代码]PTransactionManagementError is raised for any and all problems
related to database transactions.
Exceptions provided by the django.test package.
RedirectCycleErrorPclient.RedirectCycleErrorPRedirectCycleError 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 Built-in Exceptions.
8月 23, 2019