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112 lines
3.5 KiB
Plaintext
112 lines
3.5 KiB
Plaintext
.. _ref-exceptions:
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=================
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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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The ``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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``ObjectDoesNotExist`` is defined in ``django.core.exceptions``.
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``DoesNotExist`` is a subclass of the base ``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.QuerySet.get()` for further information
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on ``ObjectDoesNotExist`` and ``DoesNotExist``.
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MultipleObjectsReturned
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-----------------------
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The ``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 ``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.QuerySet.get()` for further information.
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SuspiciousOperation
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-------------------
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The ``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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The ``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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The ``ViewDoesNotExist`` exception is raised by
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``django.core.urlresolvers`` when a requested view does not exist.
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MiddlewareNotUsed
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-----------------
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The ``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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The ``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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The ``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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- If a field cannot be determined from a keyword in the query
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parameters
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- If a join is not permitted on the specified field
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- If a field name is invalid
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- If a query contains invalid order_by arguments
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Database Exceptions
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===================
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Django wraps the standard database exceptions ``DatabaseError`` and
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``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 ``django.db``.
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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 - Python Database API
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Specification v2.0`_ for further information.
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.. _`PEP 249 - Python Database API Specification v2.0`: http://www.python.org/dev/peps/pep-0249/
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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
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the Python `documentation`_ for further information on the built-in
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exceptions.
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.. _`documentation`: http://docs.python.org/lib/module-exceptions.html
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