<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang=""> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Django Exceptions — Django 1.8.19 documentation</title> <link rel="stylesheet" href="../_static/default.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../', VERSION: '1.8.19', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="top" title="Django 1.8.19 documentation" href="../contents.html" /> <link rel="up" title="API Reference" href="index.html" /> <link rel="next" title="File handling" href="files/index.html" /> <link rel="prev" title="django-admin and manage.py" href="django-admin.html" /> <script type="text/javascript" src="../templatebuiltins.js"></script> <script type="text/javascript"> (function($) { if (!django_template_builtins) { // templatebuiltins.js missing, do nothing. return; } $(document).ready(function() { // Hyperlink Django template tags and filters var base = "templates/builtins.html"; if (base == "#") { // Special case for builtins.html itself base = ""; } // Tags are keywords, class '.k' $("div.highlight\\-html\\+django span.k").each(function(i, elem) { var tagname = $(elem).text(); if ($.inArray(tagname, django_template_builtins.ttags) != -1) { var fragment = tagname.replace(/_/, '-'); $(elem).html("<a href='" + base + "#" + fragment + "'>" + tagname + "</a>"); } }); // Filters are functions, class '.nf' $("div.highlight\\-html\\+django span.nf").each(function(i, elem) { var filtername = $(elem).text(); if ($.inArray(filtername, django_template_builtins.tfilters) != -1) { var fragment = filtername.replace(/_/, '-'); $(elem).html("<a href='" + base + "#" + fragment + "'>" + filtername + "</a>"); } }); }); })(jQuery); </script> </head> <body role="document"> <div class="document"> <div id="custom-doc" class="yui-t6"> <div id="hd"> <h1><a href="../index.html">Django 1.8.19 documentation</a></h1> <div id="global-nav"> <a title="Home page" href="../index.html">Home</a> | <a title="Table of contents" href="../contents.html">Table of contents</a> | <a title="Global index" href="../genindex.html">Index</a> | <a title="Module index" href="../py-modindex.html">Modules</a> </div> <div class="nav"> « <a href="django-admin.html" title="django-admin and manage.py">previous</a> | <a href="index.html" title="API Reference" accesskey="U">up</a> | <a href="files/index.html" title="File handling">next</a> »</div> </div> <div id="bd"> <div id="yui-main"> <div class="yui-b"> <div class="yui-g" id="ref-exceptions"> <div class="section" id="s-django-exceptions"> <span id="django-exceptions"></span><h1>Django Exceptions<a class="headerlink" href="#django-exceptions" title="Permalink to this headline">¶</a></h1> <p>Django raises some of its own exceptions as well as standard Python exceptions.</p> <div class="section" id="s-module-django.core.exceptions"> <span id="s-django-core-exceptions"></span><span id="module-django.core.exceptions"></span><span id="django-core-exceptions"></span><h2>Django Core Exceptions<a class="headerlink" href="#module-django.core.exceptions" title="Permalink to this headline">¶</a></h2> <p>Django core exception classes are defined in <code class="docutils literal"><span class="pre">django.core.exceptions</span></code>.</p> <div class="section" id="s-objectdoesnotexist"> <span id="objectdoesnotexist"></span><h3><code class="docutils literal"><span class="pre">ObjectDoesNotExist</span></code><a class="headerlink" href="#objectdoesnotexist" title="Permalink to this headline">¶</a></h3> <dl class="exception"> <dt id="django.core.exceptions.ObjectDoesNotExist"> <em class="property">exception </em><code class="descname">ObjectDoesNotExist</code><a class="reference internal" href="../_modules/django/core/exceptions.html#ObjectDoesNotExist"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.core.exceptions.ObjectDoesNotExist" title="Permalink to this definition">¶</a></dt> <dd><p>The base class for <a class="reference internal" href="models/instances.html#django.db.models.Model.DoesNotExist" title="django.db.models.Model.DoesNotExist"><code class="xref py py-exc docutils literal"><span class="pre">DoesNotExist</span></code></a> exceptions; a <code class="docutils literal"><span class="pre">try/except</span></code> for <code class="docutils literal"><span class="pre">ObjectDoesNotExist</span></code> will catch <a class="reference internal" href="models/instances.html#django.db.models.Model.DoesNotExist" title="django.db.models.Model.DoesNotExist"><code class="xref py py-exc docutils literal"><span class="pre">DoesNotExist</span></code></a> exceptions for all models.</p> <p>See <a class="reference internal" href="models/querysets.html#django.db.models.query.QuerySet.get" title="django.db.models.query.QuerySet.get"><code class="xref py py-meth docutils literal"><span class="pre">get()</span></code></a> for further information on <a class="reference internal" href="#django.core.exceptions.ObjectDoesNotExist" title="django.core.exceptions.ObjectDoesNotExist"><code class="xref py py-exc docutils literal"><span class="pre">ObjectDoesNotExist</span></code></a> and <a class="reference internal" href="models/instances.html#django.db.models.Model.DoesNotExist" title="django.db.models.Model.DoesNotExist"><code class="xref py py-exc docutils literal"><span class="pre">DoesNotExist</span></code></a>.</p> </dd></dl> </div> <div class="section" id="s-fielddoesnotexist"> <span id="fielddoesnotexist"></span><h3><code class="docutils literal"><span class="pre">FieldDoesNotExist</span></code><a class="headerlink" href="#fielddoesnotexist" title="Permalink to this headline">¶</a></h3> <dl class="exception"> <dt id="django.core.exceptions.FieldDoesNotExist"> <em class="property">exception </em><code class="descname">FieldDoesNotExist</code><a class="reference internal" href="../_modules/django/core/exceptions.html#FieldDoesNotExist"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.core.exceptions.FieldDoesNotExist" title="Permalink to this definition">¶</a></dt> <dd><p>The <code class="docutils literal"><span class="pre">FieldDoesNotExist</span></code> exception is raised by a model’s <code class="docutils literal"><span class="pre">_meta.get_field()</span></code> method when the requested field does not exist on the model or on the model’s parents.</p> <div class="versionchanged"> <span class="title">Changed in Django 1.8:</span> <p>This exception was previously defined only in <code class="docutils literal"><span class="pre">django.db.models.fields</span></code> and wasn’t part of the public API.</p> </div> </dd></dl> </div> <div class="section" id="s-multipleobjectsreturned"> <span id="multipleobjectsreturned"></span><h3><code class="docutils literal"><span class="pre">MultipleObjectsReturned</span></code><a class="headerlink" href="#multipleobjectsreturned" title="Permalink to this headline">¶</a></h3> <dl class="exception"> <dt id="django.core.exceptions.MultipleObjectsReturned"> <em class="property">exception </em><code class="descname">MultipleObjectsReturned</code><a class="reference internal" href="../_modules/django/core/exceptions.html#MultipleObjectsReturned"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.core.exceptions.MultipleObjectsReturned" title="Permalink to this definition">¶</a></dt> <dd><p>The <a class="reference internal" href="#django.core.exceptions.MultipleObjectsReturned" title="django.core.exceptions.MultipleObjectsReturned"><code class="xref py py-exc docutils literal"><span class="pre">MultipleObjectsReturned</span></code></a> 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 <a class="reference internal" href="#module-django.core.exceptions" title="django.core.exceptions: Django core exceptions"><code class="xref py py-mod docutils literal"><span class="pre">django.core.exceptions</span></code></a>; each model class contains a subclassed version that can be used to identify the specific object type that has returned multiple objects.</p> <p>See <a class="reference internal" href="models/querysets.html#django.db.models.query.QuerySet.get" title="django.db.models.query.QuerySet.get"><code class="xref py py-meth docutils literal"><span class="pre">get()</span></code></a> for further information.</p> </dd></dl> </div> <div class="section" id="s-suspiciousoperation"> <span id="suspiciousoperation"></span><h3><code class="docutils literal"><span class="pre">SuspiciousOperation</span></code><a class="headerlink" href="#suspiciousoperation" title="Permalink to this headline">¶</a></h3> <dl class="exception"> <dt id="django.core.exceptions.SuspiciousOperation"> <em class="property">exception </em><code class="descname">SuspiciousOperation</code><a class="reference internal" href="../_modules/django/core/exceptions.html#SuspiciousOperation"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.core.exceptions.SuspiciousOperation" title="Permalink to this definition">¶</a></dt> <dd><p>The <a class="reference internal" href="#django.core.exceptions.SuspiciousOperation" title="django.core.exceptions.SuspiciousOperation"><code class="xref py py-exc docutils literal"><span class="pre">SuspiciousOperation</span></code></a> 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 <code class="docutils literal"><span class="pre">SuspiciousOperation</span></code> include:</p> <ul class="simple"> <li><code class="docutils literal"><span class="pre">DisallowedHost</span></code></li> <li><code class="docutils literal"><span class="pre">DisallowedModelAdminLookup</span></code></li> <li><code class="docutils literal"><span class="pre">DisallowedModelAdminToField</span></code></li> <li><code class="docutils literal"><span class="pre">DisallowedRedirect</span></code></li> <li><code class="docutils literal"><span class="pre">InvalidSessionKey</span></code></li> <li><code class="docutils literal"><span class="pre">SuspiciousFileOperation</span></code></li> <li><code class="docutils literal"><span class="pre">SuspiciousMultipartForm</span></code></li> <li><code class="docutils literal"><span class="pre">SuspiciousSession</span></code></li> </ul> <p>If a <code class="docutils literal"><span class="pre">SuspiciousOperation</span></code> exception reaches the WSGI handler level it is logged at the <code class="docutils literal"><span class="pre">Error</span></code> level and results in a <a class="reference internal" href="request-response.html#django.http.HttpResponseBadRequest" title="django.http.HttpResponseBadRequest"><code class="xref py py-class docutils literal"><span class="pre">HttpResponseBadRequest</span></code></a>. See the <a class="reference internal" href="../topics/logging.html"><span class="doc">logging documentation</span></a> for more information.</p> </dd></dl> </div> <div class="section" id="s-permissiondenied"> <span id="permissiondenied"></span><h3><code class="docutils literal"><span class="pre">PermissionDenied</span></code><a class="headerlink" href="#permissiondenied" title="Permalink to this headline">¶</a></h3> <dl class="exception"> <dt id="django.core.exceptions.PermissionDenied"> <em class="property">exception </em><code class="descname">PermissionDenied</code><a class="reference internal" href="../_modules/django/core/exceptions.html#PermissionDenied"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.core.exceptions.PermissionDenied" title="Permalink to this definition">¶</a></dt> <dd><p>The <a class="reference internal" href="#django.core.exceptions.PermissionDenied" title="django.core.exceptions.PermissionDenied"><code class="xref py py-exc docutils literal"><span class="pre">PermissionDenied</span></code></a> exception is raised when a user does not have permission to perform the action requested.</p> </dd></dl> </div> <div class="section" id="s-viewdoesnotexist"> <span id="viewdoesnotexist"></span><h3><code class="docutils literal"><span class="pre">ViewDoesNotExist</span></code><a class="headerlink" href="#viewdoesnotexist" title="Permalink to this headline">¶</a></h3> <dl class="exception"> <dt id="django.core.exceptions.ViewDoesNotExist"> <em class="property">exception </em><code class="descname">ViewDoesNotExist</code><a class="reference internal" href="../_modules/django/core/exceptions.html#ViewDoesNotExist"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.core.exceptions.ViewDoesNotExist" title="Permalink to this definition">¶</a></dt> <dd><p>The <a class="reference internal" href="#django.core.exceptions.ViewDoesNotExist" title="django.core.exceptions.ViewDoesNotExist"><code class="xref py py-exc docutils literal"><span class="pre">ViewDoesNotExist</span></code></a> exception is raised by <a class="reference internal" href="urlresolvers.html#module-django.core.urlresolvers" title="django.core.urlresolvers"><code class="xref py py-mod docutils literal"><span class="pre">django.core.urlresolvers</span></code></a> when a requested view does not exist.</p> </dd></dl> </div> <div class="section" id="s-middlewarenotused"> <span id="middlewarenotused"></span><h3><code class="docutils literal"><span class="pre">MiddlewareNotUsed</span></code><a class="headerlink" href="#middlewarenotused" title="Permalink to this headline">¶</a></h3> <dl class="exception"> <dt id="django.core.exceptions.MiddlewareNotUsed"> <em class="property">exception </em><code class="descname">MiddlewareNotUsed</code><a class="reference internal" href="../_modules/django/core/exceptions.html#MiddlewareNotUsed"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.core.exceptions.MiddlewareNotUsed" title="Permalink to this definition">¶</a></dt> <dd><p>The <a class="reference internal" href="#django.core.exceptions.MiddlewareNotUsed" title="django.core.exceptions.MiddlewareNotUsed"><code class="xref py py-exc docutils literal"><span class="pre">MiddlewareNotUsed</span></code></a> exception is raised when a middleware is not used in the server configuration.</p> </dd></dl> </div> <div class="section" id="s-improperlyconfigured"> <span id="improperlyconfigured"></span><h3><code class="docutils literal"><span class="pre">ImproperlyConfigured</span></code><a class="headerlink" href="#improperlyconfigured" title="Permalink to this headline">¶</a></h3> <dl class="exception"> <dt id="django.core.exceptions.ImproperlyConfigured"> <em class="property">exception </em><code class="descname">ImproperlyConfigured</code><a class="reference internal" href="../_modules/django/core/exceptions.html#ImproperlyConfigured"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.core.exceptions.ImproperlyConfigured" title="Permalink to this definition">¶</a></dt> <dd><p>The <a class="reference internal" href="#django.core.exceptions.ImproperlyConfigured" title="django.core.exceptions.ImproperlyConfigured"><code class="xref py py-exc docutils literal"><span class="pre">ImproperlyConfigured</span></code></a> exception is raised when Django is somehow improperly configured – for example, if a value in <code class="docutils literal"><span class="pre">settings.py</span></code> is incorrect or unparseable.</p> </dd></dl> </div> <div class="section" id="s-fielderror"> <span id="fielderror"></span><h3><code class="docutils literal"><span class="pre">FieldError</span></code><a class="headerlink" href="#fielderror" title="Permalink to this headline">¶</a></h3> <dl class="exception"> <dt id="django.core.exceptions.FieldError"> <em class="property">exception </em><code class="descname">FieldError</code><a class="reference internal" href="../_modules/django/core/exceptions.html#FieldError"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.core.exceptions.FieldError" title="Permalink to this definition">¶</a></dt> <dd><p>The <a class="reference internal" href="#django.core.exceptions.FieldError" title="django.core.exceptions.FieldError"><code class="xref py py-exc docutils literal"><span class="pre">FieldError</span></code></a> exception is raised when there is a problem with a model field. This can happen for several reasons:</p> <ul class="simple"> <li>A field in a model clashes with a field of the same name from an abstract base class</li> <li>An infinite loop is caused by ordering</li> <li>A keyword cannot be parsed from the filter parameters</li> <li>A field cannot be determined from a keyword in the query parameters</li> <li>A join is not permitted on the specified field</li> <li>A field name is invalid</li> <li>A query contains invalid order_by arguments</li> </ul> </dd></dl> </div> <div class="section" id="s-validationerror"> <span id="validationerror"></span><h3><code class="docutils literal"><span class="pre">ValidationError</span></code><a class="headerlink" href="#validationerror" title="Permalink to this headline">¶</a></h3> <dl class="exception"> <dt id="django.core.exceptions.ValidationError"> <em class="property">exception </em><code class="descname">ValidationError</code><a class="reference internal" href="../_modules/django/core/exceptions.html#ValidationError"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.core.exceptions.ValidationError" title="Permalink to this definition">¶</a></dt> <dd><p>The <a class="reference internal" href="#django.core.exceptions.ValidationError" title="django.core.exceptions.ValidationError"><code class="xref py py-exc docutils literal"><span class="pre">ValidationError</span></code></a> exception is raised when data fails form or model field validation. For more information about validation, see <a class="reference internal" href="forms/validation.html"><span class="doc">Form and Field Validation</span></a>, <a class="reference internal" href="models/instances.html#validating-objects"><span class="std std-ref">Model Field Validation</span></a> and the <a class="reference internal" href="validators.html"><span class="doc">Validator Reference</span></a>.</p> </dd></dl> <div class="section" id="s-non-field-errors"> <span id="non-field-errors"></span><h4><code class="docutils literal"><span class="pre">NON_FIELD_ERRORS</span></code><a class="headerlink" href="#non-field-errors" title="Permalink to this headline">¶</a></h4> <dl class="data"> <dt id="django.core.exceptions.NON_FIELD_ERRORS"> <code class="descname">NON_FIELD_ERRORS</code><a class="headerlink" href="#django.core.exceptions.NON_FIELD_ERRORS" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <p><code class="docutils literal"><span class="pre">ValidationError</span></code>s that don’t belong to a particular field in a form or model are classified as <code class="docutils literal"><span class="pre">NON_FIELD_ERRORS</span></code>. This constant is used as a key in dictionaries that otherwise map fields to their respective list of errors.</p> </div> </div> </div> <div class="section" id="s-url-resolver-exceptions"> <span id="url-resolver-exceptions"></span><h2>URL Resolver exceptions<a class="headerlink" href="#url-resolver-exceptions" title="Permalink to this headline">¶</a></h2> <p>URL Resolver exceptions are defined in <code class="docutils literal"><span class="pre">django.core.urlresolvers</span></code>.</p> <div class="section" id="s-resolver404"> <span id="resolver404"></span><h3><code class="docutils literal"><span class="pre">Resolver404</span></code><a class="headerlink" href="#resolver404" title="Permalink to this headline">¶</a></h3> <dl class="exception"> <dt id="django.core.urlresolvers.Resolver404"> <em class="property">exception </em><code class="descname">Resolver404</code><a class="reference internal" href="../_modules/django/core/urlresolvers.html#Resolver404"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.core.urlresolvers.Resolver404" title="Permalink to this definition">¶</a></dt> <dd><p>The <a class="reference internal" href="#django.core.urlresolvers.Resolver404" title="django.core.urlresolvers.Resolver404"><code class="xref py py-exc docutils literal"><span class="pre">Resolver404</span></code></a> exception is raised by <a class="reference internal" href="urlresolvers.html#django.core.urlresolvers.resolve" title="django.core.urlresolvers.resolve"><code class="xref py py-func docutils literal"><span class="pre">django.core.urlresolvers.resolve()</span></code></a> if the path passed to <code class="docutils literal"><span class="pre">resolve()</span></code> doesn’t map to a view. It’s a subclass of <a class="reference internal" href="../topics/http/views.html#django.http.Http404" title="django.http.Http404"><code class="xref py py-class docutils literal"><span class="pre">django.http.Http404</span></code></a>.</p> </dd></dl> </div> <div class="section" id="s-noreversematch"> <span id="noreversematch"></span><h3><code class="docutils literal"><span class="pre">NoReverseMatch</span></code><a class="headerlink" href="#noreversematch" title="Permalink to this headline">¶</a></h3> <dl class="exception"> <dt id="django.core.urlresolvers.NoReverseMatch"> <em class="property">exception </em><code class="descname">NoReverseMatch</code><a class="reference internal" href="../_modules/django/core/urlresolvers.html#NoReverseMatch"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.core.urlresolvers.NoReverseMatch" title="Permalink to this definition">¶</a></dt> <dd><p>The <a class="reference internal" href="#django.core.urlresolvers.NoReverseMatch" title="django.core.urlresolvers.NoReverseMatch"><code class="xref py py-exc docutils literal"><span class="pre">NoReverseMatch</span></code></a> exception is raised by <a class="reference internal" href="urlresolvers.html#module-django.core.urlresolvers" title="django.core.urlresolvers"><code class="xref py py-mod docutils literal"><span class="pre">django.core.urlresolvers</span></code></a> when a matching URL in your URLconf cannot be identified based on the parameters supplied.</p> </dd></dl> </div> </div> <div class="section" id="s-database-exceptions"> <span id="database-exceptions"></span><h2>Database Exceptions<a class="headerlink" href="#database-exceptions" title="Permalink to this headline">¶</a></h2> <p>Database exceptions may be imported from <code class="docutils literal"><span class="pre">django.db</span></code>.</p> <p>Django wraps the standard database exceptions so that your Django code has a guaranteed common implementation of these classes.</p> <dl class="exception"> <dt id="django.db.Error"> <em class="property">exception </em><code class="descname">Error</code><a class="reference internal" href="../_modules/django/db/utils.html#Error"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.db.Error" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="exception"> <dt id="django.db.InterfaceError"> <em class="property">exception </em><code class="descname">InterfaceError</code><a class="reference internal" href="../_modules/django/db/utils.html#InterfaceError"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.db.InterfaceError" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="exception"> <dt id="django.db.DatabaseError"> <em class="property">exception </em><code class="descname">DatabaseError</code><a class="reference internal" href="../_modules/django/db/utils.html#DatabaseError"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.db.DatabaseError" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="exception"> <dt id="django.db.DataError"> <em class="property">exception </em><code class="descname">DataError</code><a class="reference internal" href="../_modules/django/db/utils.html#DataError"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.db.DataError" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="exception"> <dt id="django.db.OperationalError"> <em class="property">exception </em><code class="descname">OperationalError</code><a class="reference internal" href="../_modules/django/db/utils.html#OperationalError"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.db.OperationalError" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="exception"> <dt id="django.db.IntegrityError"> <em class="property">exception </em><code class="descname">IntegrityError</code><a class="reference internal" href="../_modules/django/db/utils.html#IntegrityError"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.db.IntegrityError" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="exception"> <dt id="django.db.InternalError"> <em class="property">exception </em><code class="descname">InternalError</code><a class="reference internal" href="../_modules/django/db/utils.html#InternalError"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.db.InternalError" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="exception"> <dt id="django.db.ProgrammingError"> <em class="property">exception </em><code class="descname">ProgrammingError</code><a class="reference internal" href="../_modules/django/db/utils.html#ProgrammingError"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.db.ProgrammingError" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <dl class="exception"> <dt id="django.db.NotSupportedError"> <em class="property">exception </em><code class="descname">NotSupportedError</code><a class="reference internal" href="../_modules/django/db/utils.html#NotSupportedError"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.db.NotSupportedError" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <p>The Django wrappers for database exceptions behave exactly the same as the underlying database exceptions. See <span class="target" id="index-0"></span><a class="pep reference external" href="https://www.python.org/dev/peps/pep-0249"><strong>PEP 249</strong></a>, the Python Database API Specification v2.0, for further information.</p> <p>As per <span class="target" id="index-1"></span><a class="pep reference external" href="https://www.python.org/dev/peps/pep-3134"><strong>PEP 3134</strong></a>, a <code class="docutils literal"><span class="pre">__cause__</span></code> 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 <span class="target" id="index-2"></span><a class="pep reference external" href="https://www.python.org/dev/peps/pep-3134"><strong>PEP 3134</strong></a> normally only applies to Python 3.)</p> <dl class="exception"> <dt id="django.db.models.ProtectedError"> <em class="property">exception </em><code class="descclassname">models.</code><code class="descname">ProtectedError</code><a class="headerlink" href="#django.db.models.ProtectedError" title="Permalink to this definition">¶</a></dt> <dd></dd></dl> <p>Raised to prevent deletion of referenced objects when using <a class="reference internal" href="models/fields.html#django.db.models.PROTECT" title="django.db.models.PROTECT"><code class="xref py py-attr docutils literal"><span class="pre">django.db.models.PROTECT</span></code></a>. <a class="reference internal" href="#django.db.models.ProtectedError" title="django.db.models.ProtectedError"><code class="xref py py-exc docutils literal"><span class="pre">models.ProtectedError</span></code></a> is a subclass of <a class="reference internal" href="#django.db.IntegrityError" title="django.db.IntegrityError"><code class="xref py py-exc docutils literal"><span class="pre">IntegrityError</span></code></a>.</p> </div> <div class="section" id="s-http-exceptions"> <span id="http-exceptions"></span><h2>Http Exceptions<a class="headerlink" href="#http-exceptions" title="Permalink to this headline">¶</a></h2> <p>Http exceptions may be imported from <code class="docutils literal"><span class="pre">django.http</span></code>.</p> <div class="section" id="s-unreadableposterror"> <span id="unreadableposterror"></span><h3><code class="docutils literal"><span class="pre">UnreadablePostError</span></code><a class="headerlink" href="#unreadableposterror" title="Permalink to this headline">¶</a></h3> <dl class="exception"> <dt id="django.http.UnreadablePostError"> <em class="property">exception </em><code class="descname">UnreadablePostError</code><a class="reference internal" href="../_modules/django/http/request.html#UnreadablePostError"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.http.UnreadablePostError" title="Permalink to this definition">¶</a></dt> <dd><p><a class="reference internal" href="#django.http.UnreadablePostError" title="django.http.UnreadablePostError"><code class="xref py py-exc docutils literal"><span class="pre">UnreadablePostError</span></code></a> is raised when a user cancels an upload.</p> </dd></dl> </div> </div> <div class="section" id="s-transaction-exceptions"> <span id="transaction-exceptions"></span><h2>Transaction Exceptions<a class="headerlink" href="#transaction-exceptions" title="Permalink to this headline">¶</a></h2> <p>Transaction exceptions are defined in <code class="docutils literal"><span class="pre">django.db.transaction</span></code>.</p> <div class="section" id="s-transactionmanagementerror"> <span id="transactionmanagementerror"></span><h3><code class="docutils literal"><span class="pre">TransactionManagementError</span></code><a class="headerlink" href="#transactionmanagementerror" title="Permalink to this headline">¶</a></h3> <dl class="exception"> <dt id="django.db.transaction.TransactionManagementError"> <em class="property">exception </em><code class="descname">TransactionManagementError</code><a class="reference internal" href="../_modules/django/db/transaction.html#TransactionManagementError"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.db.transaction.TransactionManagementError" title="Permalink to this definition">¶</a></dt> <dd><p><a class="reference internal" href="#django.db.transaction.TransactionManagementError" title="django.db.transaction.TransactionManagementError"><code class="xref py py-exc docutils literal"><span class="pre">TransactionManagementError</span></code></a> is raised for any and all problems related to database transactions.</p> </dd></dl> </div> </div> <div class="section" id="s-testing-framework-exceptions"> <span id="testing-framework-exceptions"></span><h2>Testing Framework Exceptions<a class="headerlink" href="#testing-framework-exceptions" title="Permalink to this headline">¶</a></h2> <p>Exceptions provided by the <code class="docutils literal"><span class="pre">django.test</span></code> package.</p> <div class="section" id="s-redirectcycleerror"> <span id="redirectcycleerror"></span><h3><code class="docutils literal"><span class="pre">RedirectCycleError</span></code><a class="headerlink" href="#redirectcycleerror" title="Permalink to this headline">¶</a></h3> <dl class="exception"> <dt id="django.test.client.RedirectCycleError"> <em class="property">exception </em><code class="descclassname">client.</code><code class="descname">RedirectCycleError</code><a class="headerlink" href="#django.test.client.RedirectCycleError" title="Permalink to this definition">¶</a></dt> <dd><div class="versionadded"> <span class="title">New in Django 1.8.</span> </div> <p><a class="reference internal" href="#django.test.client.RedirectCycleError" title="django.test.client.RedirectCycleError"><code class="xref py py-exc docutils literal"><span class="pre">RedirectCycleError</span></code></a> is raised when the test client detects a loop or an overly long chain of redirects.</p> </dd></dl> </div> </div> <div class="section" id="s-python-exceptions"> <span id="python-exceptions"></span><h2>Python Exceptions<a class="headerlink" href="#python-exceptions" title="Permalink to this headline">¶</a></h2> <p>Django raises built-in Python exceptions when appropriate as well. See the Python documentation for further information on the <span class="xref std std-ref">bltin-exceptions</span>.</p> </div> </div> </div> </div> </div> <div class="yui-b" id="sidebar"> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h3><a href="../contents.html">Table Of Contents</a></h3> <ul> <li><a class="reference internal" href="#">Django Exceptions</a><ul> <li><a class="reference internal" href="#module-django.core.exceptions">Django Core Exceptions</a><ul> <li><a class="reference internal" href="#objectdoesnotexist"><code class="docutils literal"><span class="pre">ObjectDoesNotExist</span></code></a></li> <li><a class="reference internal" href="#fielddoesnotexist"><code class="docutils literal"><span class="pre">FieldDoesNotExist</span></code></a></li> <li><a class="reference internal" href="#multipleobjectsreturned"><code class="docutils literal"><span class="pre">MultipleObjectsReturned</span></code></a></li> <li><a class="reference internal" href="#suspiciousoperation"><code class="docutils literal"><span class="pre">SuspiciousOperation</span></code></a></li> <li><a class="reference internal" href="#permissiondenied"><code class="docutils literal"><span class="pre">PermissionDenied</span></code></a></li> <li><a class="reference internal" href="#viewdoesnotexist"><code class="docutils literal"><span class="pre">ViewDoesNotExist</span></code></a></li> <li><a class="reference internal" href="#middlewarenotused"><code class="docutils literal"><span class="pre">MiddlewareNotUsed</span></code></a></li> <li><a class="reference internal" href="#improperlyconfigured"><code class="docutils literal"><span class="pre">ImproperlyConfigured</span></code></a></li> <li><a class="reference internal" href="#fielderror"><code class="docutils literal"><span class="pre">FieldError</span></code></a></li> <li><a class="reference internal" href="#validationerror"><code class="docutils literal"><span class="pre">ValidationError</span></code></a><ul> <li><a class="reference internal" href="#non-field-errors"><code class="docutils literal"><span class="pre">NON_FIELD_ERRORS</span></code></a></li> </ul> </li> </ul> </li> <li><a class="reference internal" href="#url-resolver-exceptions">URL Resolver exceptions</a><ul> <li><a class="reference internal" href="#resolver404"><code class="docutils literal"><span class="pre">Resolver404</span></code></a></li> <li><a class="reference internal" href="#noreversematch"><code class="docutils literal"><span class="pre">NoReverseMatch</span></code></a></li> </ul> </li> <li><a class="reference internal" href="#database-exceptions">Database Exceptions</a></li> <li><a class="reference internal" href="#http-exceptions">Http Exceptions</a><ul> <li><a class="reference internal" href="#unreadableposterror"><code class="docutils literal"><span class="pre">UnreadablePostError</span></code></a></li> </ul> </li> <li><a class="reference internal" href="#transaction-exceptions">Transaction Exceptions</a><ul> <li><a class="reference internal" href="#transactionmanagementerror"><code class="docutils literal"><span class="pre">TransactionManagementError</span></code></a></li> </ul> </li> <li><a class="reference internal" href="#testing-framework-exceptions">Testing Framework Exceptions</a><ul> <li><a class="reference internal" href="#redirectcycleerror"><code class="docutils literal"><span class="pre">RedirectCycleError</span></code></a></li> </ul> </li> <li><a class="reference internal" href="#python-exceptions">Python Exceptions</a></li> </ul> </li> </ul> <h3>Browse</h3> <ul> <li>Prev: <a href="django-admin.html">django-admin and manage.py</a></li> <li>Next: <a href="files/index.html">File handling</a></li> </ul> <h3>You are here:</h3> <ul> <li> <a href="../index.html">Django 1.8.19 documentation</a> <ul><li><a href="index.html">API Reference</a> <ul><li>Django Exceptions</li></ul> </li></ul> </li> </ul> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../_sources/ref/exceptions.txt" rel="nofollow">Show Source</a></li> </ul> </div> <div id="searchbox" style="display: none" role="search"> <h3>Quick search</h3> <form class="search" action="../search.html" method="get"> <div><input type="text" name="q" /></div> <div><input type="submit" value="Go" /></div> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <h3>Last update:</h3> <p class="topless">Mar 10, 2018</p> </div> </div> <div id="ft"> <div class="nav"> « <a href="django-admin.html" title="django-admin and manage.py">previous</a> | <a href="index.html" title="API Reference" accesskey="U">up</a> | <a href="files/index.html" title="File handling">next</a> »</div> </div> </div> <div class="clearer"></div> </div> </body> </html>