Django raises some Django specific exceptions as well as many standard Python exceptions.
Django Core Exceptions¶
Django core exception classes are defined in
ObjectDoesNotExist and DoesNotExist¶
DoesNotExistexception is raised when an object is not found for the given parameters of a query. Django provides a
DoesNotExistexception as an attribute of each model class to identify the class of object that could not be found and to allow you to catch a particular model class with
MultipleObjectsReturnedexception 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.
get()for further information.
SuspiciousOperationexception 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:
FieldErrorexception is raised when there is a problem with a model field. This can happen for several reasons:
- A field in a model clashes with a field of the same name from an abstract base class
- An infinite loop is caused by ordering
- A keyword cannot be parsed from the filter parameters
- A field cannot be determined from a keyword in the query parameters
- A join is not permitted on the specified field
- A field name is invalid
- A query contains invalid order_by arguments
URL Resolver exceptions¶
URL Resolver exceptions are defined in
Database exceptions are provided in
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. (Note that this attribute is available under
both Python 2 and Python 3, although PEP 3134 normally only applies
to Python 3.)
Previous versions of Django only wrapped
IntegrityError, and did not provide
Http exceptions are provided in
Transaction exceptions are defined in