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056a3c6c37
When the test client detects a redirect to a URL seen in the currently followed chain it will now raise a RedirectCycleError instead of just returning the first repeated response. It will also complain when a single chain of redirects is longer than 20, as this often means a redirect loop with varying URLs, and even if it's not actually one, such long chains are likely to be treated as loops by browsers. Thanks Preston Timmons, Berker Peksag, and Tim Graham for reviews.
239 lines
7.4 KiB
Plaintext
239 lines
7.4 KiB
Plaintext
=================
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Django Exceptions
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=================
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Django raises some Django specific exceptions as well as many standard
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Python exceptions.
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Django Core Exceptions
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======================
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.. module:: django.core.exceptions
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:synopsis: Django core exceptions
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Django core exception classes are defined in :mod:`django.core.exceptions`.
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ObjectDoesNotExist and DoesNotExist
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-----------------------------------
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.. exception:: DoesNotExist
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The ``DoesNotExist`` exception is raised when an object is not found for
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the given parameters of a query. Django provides a ``DoesNotExist``
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exception as an attribute of each model class to identify the class of
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object that could not be found and to allow you to catch a particular model
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class with ``try/except``.
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.. exception:: ObjectDoesNotExist
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The base class for ``DoesNotExist`` exceptions; a ``try/except`` for
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``ObjectDoesNotExist`` will catch ``DoesNotExist`` exceptions for all
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models.
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See :meth:`~django.db.models.query.QuerySet.get()` for further information
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on :exc:`ObjectDoesNotExist` and :exc:`DoesNotExist`.
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MultipleObjectsReturned
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-----------------------
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.. exception:: MultipleObjectsReturned
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The :exc:`MultipleObjectsReturned` exception is raised by a query if only
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one object is expected, but multiple objects are returned. A base version
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of this exception is provided in :mod:`django.core.exceptions`; each model
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class contains a subclassed version that can be used to identify the
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specific object type that has returned multiple objects.
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See :meth:`~django.db.models.query.QuerySet.get()` for further information.
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SuspiciousOperation
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-------------------
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.. exception:: SuspiciousOperation
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The :exc:`SuspiciousOperation` exception is raised when a user has
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performed an operation that should be considered suspicious from a security
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perspective, such as tampering with a session cookie. Subclasses of
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SuspiciousOperation include:
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* DisallowedHost
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* DisallowedModelAdminLookup
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* DisallowedModelAdminToField
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* DisallowedRedirect
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* InvalidSessionKey
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* SuspiciousFileOperation
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* SuspiciousMultipartForm
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* SuspiciousSession
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* WizardViewCookieModified
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If a ``SuspiciousOperation`` exception reaches the WSGI handler level it is
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logged at the ``Error`` level and results in
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a :class:`~django.http.HttpResponseBadRequest`. See the :doc:`logging
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documentation </topics/logging/>` for more information.
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PermissionDenied
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----------------
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.. exception:: PermissionDenied
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The :exc:`PermissionDenied` exception is raised when a user does not have
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permission to perform the action requested.
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ViewDoesNotExist
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----------------
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.. exception:: ViewDoesNotExist
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The :exc:`ViewDoesNotExist` exception is raised by
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:mod:`django.core.urlresolvers` when a requested view does not exist.
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MiddlewareNotUsed
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-----------------
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.. exception:: MiddlewareNotUsed
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The :exc:`MiddlewareNotUsed` exception is raised when a middleware is not
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used in the server configuration.
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ImproperlyConfigured
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--------------------
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.. exception:: ImproperlyConfigured
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The :exc:`ImproperlyConfigured` exception is raised when Django is
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somehow improperly configured -- for example, if a value in ``settings.py``
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is incorrect or unparseable.
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FieldError
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----------
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.. exception:: FieldError
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The :exc:`FieldError` exception is raised when there is a problem with a
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model field. This can happen for several reasons:
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- A field in a model clashes with a field of the same name from an
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abstract base class
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- An infinite loop is caused by ordering
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- A keyword cannot be parsed from the filter parameters
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- A field cannot be determined from a keyword in the query
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parameters
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- A join is not permitted on the specified field
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- A field name is invalid
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- A query contains invalid order_by arguments
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ValidationError
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---------------
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.. exception:: ValidationError
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The :exc:`ValidationError` exception is raised when data fails form or
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model field validation. For more information about validation, see
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:doc:`Form and Field Validation </ref/forms/validation>`,
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:ref:`Model Field Validation <validating-objects>` and the
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:doc:`Validator Reference </ref/validators>`.
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NON_FIELD_ERRORS
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~~~~~~~~~~~~~~~~
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.. data:: NON_FIELD_ERRORS
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``ValidationError``\s that don't belong to a particular field in a form
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or model are classified as ``NON_FIELD_ERRORS``. This constant is used
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as a key in dictionaries that otherwise map fields to their respective
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list of errors.
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.. currentmodule:: django.core.urlresolvers
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URL Resolver exceptions
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=======================
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URL Resolver exceptions are defined in :mod:`django.core.urlresolvers`.
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Resolver404
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--------------
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.. exception:: Resolver404
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The :exc:`Resolver404` exception is raised by
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:func:`django.core.urlresolvers.resolve()` if the path passed to
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``resolve()`` doesn't map to a view. It's a subclass of
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:class:`django.http.Http404`
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NoReverseMatch
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--------------
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.. exception:: NoReverseMatch
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The :exc:`NoReverseMatch` exception is raised by
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:mod:`django.core.urlresolvers` when a matching URL in your URLconf
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cannot be identified based on the parameters supplied.
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.. currentmodule:: django.db
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Database Exceptions
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===================
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Database exceptions are provided in :mod:`django.db`.
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Django wraps the standard database exceptions so that your Django code has a
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guaranteed common implementation of these classes.
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.. exception:: Error
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.. exception:: InterfaceError
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.. exception:: DatabaseError
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.. exception:: DataError
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.. exception:: OperationalError
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.. exception:: IntegrityError
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.. exception:: InternalError
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.. exception:: ProgrammingError
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.. exception:: NotSupportedError
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The Django wrappers for database exceptions behave exactly the same as
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the underlying database exceptions. See :pep:`249`, the Python Database API
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Specification v2.0, for further information.
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As per :pep:`3134`, a ``__cause__`` attribute is set with the original
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(underlying) database exception, allowing access to any additional
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information provided. (Note that this attribute is available under
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both Python 2 and Python 3, although :pep:`3134` normally only applies
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to Python 3.)
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.. exception:: models.ProtectedError
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Raised to prevent deletion of referenced objects when using
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:attr:`django.db.models.PROTECT`. :exc:`models.ProtectedError` is a subclass
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of :exc:`IntegrityError`.
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.. currentmodule:: django.http
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Http Exceptions
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===============
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Http exceptions are provided in :mod:`django.http`.
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.. exception:: UnreadablePostError
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The :exc:`UnreadablePostError` is raised when a user cancels an upload.
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.. currentmodule:: django.db.transaction
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Transaction Exceptions
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======================
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Transaction exceptions are defined in :mod:`django.db.transaction`.
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.. exception:: TransactionManagementError
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The :exc:`TransactionManagementError` is raised for any and all problems
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related to database transactions.
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.. currentmodule:: django.test
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Testing Framework Exceptions
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============================
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Exceptions provided by the :mod:`django.test` package.
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.. exception:: client.RedirectCycleError
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.. versionadded:: 1.8
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:exc:`~client.RedirectCycleError` is raised when the test client detects a
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loop or an overly long chain of redirects.
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Python Exceptions
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=================
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Django raises built-in Python exceptions when appropriate as well. See the
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Python documentation for further information on the :ref:`bltin-exceptions`.
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