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<h1><a href="../index.html">Django 1.4.5 documentation</a></h1>
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<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 Django specific exceptions as well as many standard
Python exceptions.</p>
<div class="section" id="s-module-django.core.exceptions">
<span id="s-django-specific-exceptions"></span><span id="module-django.core.exceptions"></span><span id="django-specific-exceptions"></span><h2>Django-specific Exceptions<a class="headerlink" href="#module-django.core.exceptions" title="Permalink to this headline">¶</a></h2>
<div class="section" id="s-objectdoesnotexist-and-doesnotexist">
<span id="objectdoesnotexist-and-doesnotexist"></span><h3>ObjectDoesNotExist and DoesNotExist<a class="headerlink" href="#objectdoesnotexist-and-doesnotexist" title="Permalink to this headline">¶</a></h3>
<dl class="exception">
<dt id="django.core.exceptions.DoesNotExist">
<em class="property">exception </em><tt class="descname">DoesNotExist</tt><a class="headerlink" href="#django.core.exceptions.DoesNotExist" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="exception">
<dt id="django.core.exceptions.ObjectDoesNotExist">
<em class="property">exception </em><tt class="descname">ObjectDoesNotExist</tt><a class="headerlink" href="#django.core.exceptions.ObjectDoesNotExist" title="Permalink to this definition">¶</a></dt>
<dd><p>The <a class="reference internal" href="#django.core.exceptions.DoesNotExist" title="django.core.exceptions.DoesNotExist"><tt class="xref py py-exc docutils literal"><span class="pre">DoesNotExist</span></tt></a> exception is raised when an object is not found
for the given parameters of a query.</p>
<p><a class="reference internal" href="#django.core.exceptions.ObjectDoesNotExist" title="django.core.exceptions.ObjectDoesNotExist"><tt class="xref py py-exc docutils literal"><span class="pre">ObjectDoesNotExist</span></tt></a> is defined in <a class="reference internal" href="#module-django.core.exceptions" title="django.core.exceptions: Django specific exceptions"><tt class="xref py py-mod docutils literal"><span class="pre">django.core.exceptions</span></tt></a>.
<a class="reference internal" href="#django.core.exceptions.DoesNotExist" title="django.core.exceptions.DoesNotExist"><tt class="xref py py-exc docutils literal"><span class="pre">DoesNotExist</span></tt></a> is a subclass of the base <a class="reference internal" href="#django.core.exceptions.ObjectDoesNotExist" title="django.core.exceptions.ObjectDoesNotExist"><tt class="xref py py-exc docutils literal"><span class="pre">ObjectDoesNotExist</span></tt></a>
exception that is provided on every model class as a way of
identifying the specific type of object that could not be found.</p>
<p>See <a class="reference internal" href="models/querysets.html#django.db.models.query.QuerySet.get" title="django.db.models.query.QuerySet.get"><tt class="xref py py-meth docutils literal"><span class="pre">get()</span></tt></a> for further information
on <a class="reference internal" href="#django.core.exceptions.ObjectDoesNotExist" title="django.core.exceptions.ObjectDoesNotExist"><tt class="xref py py-exc docutils literal"><span class="pre">ObjectDoesNotExist</span></tt></a> and <a class="reference internal" href="#django.core.exceptions.DoesNotExist" title="django.core.exceptions.DoesNotExist"><tt class="xref py py-exc docutils literal"><span class="pre">DoesNotExist</span></tt></a>.</p>
</dd></dl>
</div>
<div class="section" id="s-multipleobjectsreturned">
<span id="multipleobjectsreturned"></span><h3>MultipleObjectsReturned<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><tt class="descname">MultipleObjectsReturned</tt><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"><tt class="xref py py-exc docutils literal"><span class="pre">MultipleObjectsReturned</span></tt></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 specific exceptions"><tt class="xref py py-mod docutils literal"><span class="pre">django.core.exceptions</span></tt></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"><tt class="xref py py-meth docutils literal"><span class="pre">get()</span></tt></a> for further information.</p>
</dd></dl>
</div>
<div class="section" id="s-suspiciousoperation">
<span id="suspiciousoperation"></span><h3>SuspiciousOperation<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><tt class="descname">SuspiciousOperation</tt><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"><tt class="xref py py-exc docutils literal"><span class="pre">SuspiciousOperation</span></tt></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.</p>
</dd></dl>
</div>
<div class="section" id="s-permissiondenied">
<span id="permissiondenied"></span><h3>PermissionDenied<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><tt class="descname">PermissionDenied</tt><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"><tt class="xref py py-exc docutils literal"><span class="pre">PermissionDenied</span></tt></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>ViewDoesNotExist<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><tt class="descname">ViewDoesNotExist</tt><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"><tt class="xref py py-exc docutils literal"><span class="pre">ViewDoesNotExist</span></tt></a> exception is raised by
<a class="reference internal" href="../topics/http/urls.html#module-django.core.urlresolvers" title="django.core.urlresolvers"><tt class="xref py py-mod docutils literal"><span class="pre">django.core.urlresolvers</span></tt></a> when a requested view does not exist.</p>
</dd></dl>
</div>
<div class="section" id="s-middlewarenotused">
<span id="middlewarenotused"></span><h3>MiddlewareNotUsed<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><tt class="descname">MiddlewareNotUsed</tt><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"><tt class="xref py py-exc docutils literal"><span class="pre">MiddlewareNotUsed</span></tt></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>ImproperlyConfigured<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><tt class="descname">ImproperlyConfigured</tt><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"><tt class="xref py py-exc docutils literal"><span class="pre">ImproperlyConfigured</span></tt></a> exception is raised when Django is
somehow improperly configured – for example, if a value in <tt class="docutils literal"><span class="pre">settings.py</span></tt>
is incorrect or unparseable.</p>
</dd></dl>
</div>
<div class="section" id="s-fielderror">
<span id="fielderror"></span><h3>FieldError<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><tt class="descname">FieldError</tt><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"><tt class="xref py py-exc docutils literal"><span class="pre">FieldError</span></tt></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>ValidationError<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><tt class="descname">ValidationError</tt><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"><tt class="xref py py-exc docutils literal"><span class="pre">ValidationError</span></tt></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"><em>Form and Field Validation</em></a>,
<a class="reference internal" href="models/instances.html#validating-objects"><em>Model Field Validation</em></a> and the
<a class="reference internal" href="validators.html"><em>Validator Reference</em></a>.</p>
</dd></dl>
</div>
<div class="section" id="s-noreversematch">
<span id="noreversematch"></span><h3>NoReverseMatch<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><tt class="descname">NoReverseMatch</tt><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"><tt class="xref py py-exc docutils literal"><span class="pre">NoReverseMatch</span></tt></a> exception is raised by
<a class="reference internal" href="../topics/http/urls.html#module-django.core.urlresolvers" title="django.core.urlresolvers"><tt class="xref py py-mod docutils literal"><span class="pre">django.core.urlresolvers</span></tt></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>Django wraps the standard database exceptions <a class="reference internal" href="#django.db.DatabaseError" title="django.db.DatabaseError"><tt class="xref py py-exc docutils literal"><span class="pre">DatabaseError</span></tt></a> and
<a class="reference internal" href="#django.db.IntegrityError" title="django.db.IntegrityError"><tt class="xref py py-exc docutils literal"><span class="pre">IntegrityError</span></tt></a> so that your Django code has a guaranteed common
implementation of these classes. These database exceptions are
provided in <a class="reference internal" href="../topics/db/index.html#module-django.db" title="django.db"><tt class="xref py py-mod docutils literal"><span class="pre">django.db</span></tt></a>.</p>
<dl class="exception">
<dt id="django.db.DatabaseError">
<em class="property">exception </em><tt class="descname">DatabaseError</tt><a class="headerlink" href="#django.db.DatabaseError" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="exception">
<dt id="django.db.IntegrityError">
<em class="property">exception </em><tt class="descname">IntegrityError</tt><a class="headerlink" href="#django.db.IntegrityError" 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="http://www.python.org/dev/peps/pep-0249"><strong>PEP 249</strong></a>, the Python Database API
Specification v2.0, for further information.</p>
</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>
<dl class="exception">
<dt id="django.db.transaction.TransactionManagementError">
<em class="property">exception </em><tt class="descname">TransactionManagementError</tt><a class="headerlink" href="#django.db.transaction.TransactionManagementError" title="Permalink to this definition">¶</a></dt>
<dd><p>The <a class="reference internal" href="#django.db.transaction.TransactionManagementError" title="django.db.transaction.TransactionManagementError"><tt class="xref py py-exc docutils literal"><span class="pre">TransactionManagementError</span></tt></a> is raised for any and all problems
related to database transactions. It is available from
<a class="reference internal" href="../topics/db/transactions.html#module-django.db.transaction" title="django.db.transaction"><tt class="xref py py-mod docutils literal"><span class="pre">django.db.transaction</span></tt></a>.</p>
</dd></dl>
</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
built-in <tt class="xref py py-mod docutils literal"><span class="pre">exceptions</span></tt>.</p>
</div>
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<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-specific Exceptions</a><ul>
<li><a class="reference internal" href="#objectdoesnotexist-and-doesnotexist">ObjectDoesNotExist and DoesNotExist</a></li>
<li><a class="reference internal" href="#multipleobjectsreturned">MultipleObjectsReturned</a></li>
<li><a class="reference internal" href="#suspiciousoperation">SuspiciousOperation</a></li>
<li><a class="reference internal" href="#permissiondenied">PermissionDenied</a></li>
<li><a class="reference internal" href="#viewdoesnotexist">ViewDoesNotExist</a></li>
<li><a class="reference internal" href="#middlewarenotused">MiddlewareNotUsed</a></li>
<li><a class="reference internal" href="#improperlyconfigured">ImproperlyConfigured</a></li>
<li><a class="reference internal" href="#fielderror">FieldError</a></li>
<li><a class="reference internal" href="#validationerror">ValidationError</a></li>
<li><a class="reference internal" href="#noreversematch">NoReverseMatch</a></li>
</ul>
</li>
<li><a class="reference internal" href="#database-exceptions">Database Exceptions</a></li>
<li><a class="reference internal" href="#transaction-exceptions">Transaction Exceptions</a></li>
<li><a class="reference internal" href="#python-exceptions">Python Exceptions</a></li>
</ul>
</li>
</ul>
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