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150 lines
4.8 KiB
Text
150 lines
4.8 KiB
Text
=================
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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-specific Exceptions
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==========================
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.. module:: django.core.exceptions
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:synopsis: Django specific exceptions
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ObjectDoesNotExist and DoesNotExist
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-----------------------------------
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.. exception:: DoesNotExist
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.. exception:: ObjectDoesNotExist
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The :exc:`DoesNotExist` exception is raised when an object is not found
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for the given parameters of a query.
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:exc:`ObjectDoesNotExist` is defined in :mod:`django.core.exceptions`.
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:exc:`DoesNotExist` is a subclass of the base :exc:`ObjectDoesNotExist`
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exception that is provided on every model class as a way of
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identifying the specific type of object that could not be found.
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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 performed
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an operation that should be considered suspicious from a security perspective,
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such as tampering with a session cookie.
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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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.. currentmodule:: django.core.urlresolvers
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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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Django wraps the standard database exceptions :exc:`DatabaseError` and
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:exc:`IntegrityError` so that your Django code has a guaranteed common
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implementation of these classes. These database exceptions are
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provided in :mod:`django.db`.
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.. exception:: DatabaseError
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.. exception:: IntegrityError
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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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.. currentmodule:: django.db.transaction
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Transaction Exceptions
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======================
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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. It is available from
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:mod:`django.db.transaction`.
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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
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built-in :mod:`exceptions`.
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