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<h1><a href="../index.html">Django 1.6.7 documentation</a></h1>
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<div class="yui-g" id="ref-validators">
<div class="section" id="s-module-django.core.validators">
<span id="s-validators"></span><span id="module-django.core.validators"></span><span id="validators"></span><h1>Validators<a class="headerlink" href="#module-django.core.validators" title="Permalink to this headline">¶</a></h1>
<div class="section" id="s-writing-validators">
<span id="writing-validators"></span><h2>Writing validators<a class="headerlink" href="#writing-validators" title="Permalink to this headline">¶</a></h2>
<p>A validator is a callable that takes a value and raises a
<a class="reference internal" href="exceptions.html#django.core.exceptions.ValidationError" title="django.core.exceptions.ValidationError"><tt class="xref py py-exc docutils literal"><span class="pre">ValidationError</span></tt></a> if it doesn’t meet some
criteria. Validators can be useful for re-using validation logic between
different types of fields.</p>
<p>For example, here’s a validator that only allows even numbers:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">django.core.exceptions</span> <span class="kn">import</span> <span class="n">ValidationError</span>
<span class="k">def</span> <span class="nf">validate_even</span><span class="p">(</span><span class="n">value</span><span class="p">):</span>
<span class="k">if</span> <span class="n">value</span> <span class="o">%</span> <span class="mi">2</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="s">u'</span><span class="si">%s</span><span class="s"> is not an even number'</span> <span class="o">%</span> <span class="n">value</span><span class="p">)</span>
</pre></div>
</div>
<p>You can add this to a model field via the field’s <a class="reference internal" href="models/fields.html#django.db.models.Field.validators" title="django.db.models.Field.validators"><tt class="xref py py-attr docutils literal"><span class="pre">validators</span></tt></a>
argument:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">django.db</span> <span class="kn">import</span> <span class="n">models</span>
<span class="k">class</span> <span class="nc">MyModel</span><span class="p">(</span><span class="n">models</span><span class="o">.</span><span class="n">Model</span><span class="p">):</span>
<span class="n">even_field</span> <span class="o">=</span> <span class="n">models</span><span class="o">.</span><span class="n">IntegerField</span><span class="p">(</span><span class="n">validators</span><span class="o">=</span><span class="p">[</span><span class="n">validate_even</span><span class="p">])</span>
</pre></div>
</div>
<p>Because values are converted to Python before validators are run, you can even
use the same validator with forms:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">django</span> <span class="kn">import</span> <span class="n">forms</span>
<span class="k">class</span> <span class="nc">MyForm</span><span class="p">(</span><span class="n">forms</span><span class="o">.</span><span class="n">Form</span><span class="p">):</span>
<span class="n">even_field</span> <span class="o">=</span> <span class="n">forms</span><span class="o">.</span><span class="n">IntegerField</span><span class="p">(</span><span class="n">validators</span><span class="o">=</span><span class="p">[</span><span class="n">validate_even</span><span class="p">])</span>
</pre></div>
</div>
</div>
<div class="section" id="s-how-validators-are-run">
<span id="how-validators-are-run"></span><h2>How validators are run<a class="headerlink" href="#how-validators-are-run" title="Permalink to this headline">¶</a></h2>
<p>See the <a class="reference internal" href="forms/validation.html"><em>form validation</em></a> for more information on
how validators are run in forms, and <a class="reference internal" href="models/instances.html#validating-objects"><em>Validating objects</em></a> for how they’re run in models. Note that validators will
not be run automatically when you save a model, but if you are using a
<a class="reference internal" href="../topics/forms/modelforms.html#django.forms.ModelForm" title="django.forms.ModelForm"><tt class="xref py py-class docutils literal"><span class="pre">ModelForm</span></tt></a>, it will run your validators on any fields
that are included in your form. See the
<a class="reference internal" href="../topics/forms/modelforms.html"><em>ModelForm documentation</em></a> for information on
how model validation interacts with forms.</p>
</div>
<div class="section" id="s-built-in-validators">
<span id="built-in-validators"></span><h2>Built-in validators<a class="headerlink" href="#built-in-validators" title="Permalink to this headline">¶</a></h2>
<p>The <a class="reference internal" href="#module-django.core.validators" title="django.core.validators: Validation utilities and base classes"><tt class="xref py py-mod docutils literal"><span class="pre">django.core.validators</span></tt></a> module contains a collection of callable
validators for use with model and form fields. They’re used internally but
are available for use with your own fields, too. They can be used in addition
to, or in lieu of custom <tt class="docutils literal"><span class="pre">field.clean()</span></tt> methods.</p>
<div class="section" id="s-regexvalidator">
<span id="regexvalidator"></span><h3><tt class="docutils literal"><span class="pre">RegexValidator</span></tt><a class="headerlink" href="#regexvalidator" title="Permalink to this headline">¶</a></h3>
<dl class="class">
<dt id="django.core.validators.RegexValidator">
<em class="property">class </em><tt class="descname">RegexValidator</tt>(<span class="optional">[</span><em>regex=None</em>, <em>message=None</em>, <em>code=None</em><span class="optional">]</span>)<a class="reference internal" href="../_modules/django/core/validators.html#RegexValidator"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.core.validators.RegexValidator" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>regex</strong> – If not <tt class="docutils literal"><span class="pre">None</span></tt>, overrides <a class="reference internal" href="#django.core.validators.RegexValidator.regex" title="django.core.validators.RegexValidator.regex"><tt class="xref py py-attr docutils literal"><span class="pre">regex</span></tt></a>. Can be a regular
expression string or a pre-compiled regular expression.</li>
<li><strong>message</strong> – If not <tt class="docutils literal"><span class="pre">None</span></tt>, overrides <a class="reference internal" href="#django.core.validators.RegexValidator.message" title="django.core.validators.RegexValidator.message"><tt class="xref py py-attr docutils literal"><span class="pre">message</span></tt></a>.</li>
<li><strong>code</strong> – If not <tt class="docutils literal"><span class="pre">None</span></tt>, overrides <a class="reference internal" href="#django.core.validators.RegexValidator.code" title="django.core.validators.RegexValidator.code"><tt class="xref py py-attr docutils literal"><span class="pre">code</span></tt></a>.</li>
</ul>
</td>
</tr>
</tbody>
</table>
<dl class="attribute">
<dt id="django.core.validators.RegexValidator.regex">
<tt class="descname">regex</tt><a class="headerlink" href="#django.core.validators.RegexValidator.regex" title="Permalink to this definition">¶</a></dt>
<dd><p>The regular expression pattern to search for the provided <tt class="docutils literal"><span class="pre">value</span></tt>,
or a pre-compiled regular expression. Raises a
<a class="reference internal" href="exceptions.html#django.core.exceptions.ValidationError" title="django.core.exceptions.ValidationError"><tt class="xref py py-exc docutils literal"><span class="pre">ValidationError</span></tt></a> with <a class="reference internal" href="#django.core.validators.RegexValidator.message" title="django.core.validators.RegexValidator.message"><tt class="xref py py-attr docutils literal"><span class="pre">message</span></tt></a>
and <a class="reference internal" href="#django.core.validators.RegexValidator.code" title="django.core.validators.RegexValidator.code"><tt class="xref py py-attr docutils literal"><span class="pre">code</span></tt></a> if no match is found. By default, matches any string
(including an empty string).</p>
</dd></dl>
<dl class="attribute">
<dt id="django.core.validators.RegexValidator.message">
<tt class="descname">message</tt><a class="headerlink" href="#django.core.validators.RegexValidator.message" title="Permalink to this definition">¶</a></dt>
<dd><p>The error message used by
<a class="reference internal" href="exceptions.html#django.core.exceptions.ValidationError" title="django.core.exceptions.ValidationError"><tt class="xref py py-exc docutils literal"><span class="pre">ValidationError</span></tt></a> if validation fails.
Defaults to <tt class="docutils literal"><span class="pre">"Enter</span> <span class="pre">a</span> <span class="pre">valid</span> <span class="pre">value"</span></tt>.</p>
</dd></dl>
<dl class="attribute">
<dt id="django.core.validators.RegexValidator.code">
<tt class="descname">code</tt><a class="headerlink" href="#django.core.validators.RegexValidator.code" title="Permalink to this definition">¶</a></dt>
<dd><p>The error code used by <a class="reference internal" href="exceptions.html#django.core.exceptions.ValidationError" title="django.core.exceptions.ValidationError"><tt class="xref py py-exc docutils literal"><span class="pre">ValidationError</span></tt></a>
if validation fails. Defaults to <tt class="docutils literal"><span class="pre">"invalid"</span></tt>.</p>
</dd></dl>
</dd></dl>
</div>
<div class="section" id="s-urlvalidator">
<span id="urlvalidator"></span><h3><tt class="docutils literal"><span class="pre">URLValidator</span></tt><a class="headerlink" href="#urlvalidator" title="Permalink to this headline">¶</a></h3>
<dl class="class">
<dt id="django.core.validators.URLValidator">
<em class="property">class </em><tt class="descname">URLValidator</tt><a class="reference internal" href="../_modules/django/core/validators.html#URLValidator"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.core.validators.URLValidator" title="Permalink to this definition">¶</a></dt>
<dd><p>A <a class="reference internal" href="#django.core.validators.RegexValidator" title="django.core.validators.RegexValidator"><tt class="xref py py-class docutils literal"><span class="pre">RegexValidator</span></tt></a> that ensures a value looks like a URL, and raises
an error code of <tt class="docutils literal"><span class="pre">'invalid'</span></tt> if it doesn’t.</p>
</dd></dl>
</div>
<div class="section" id="s-validate-email">
<span id="validate-email"></span><h3><tt class="docutils literal"><span class="pre">validate_email</span></tt><a class="headerlink" href="#validate-email" title="Permalink to this headline">¶</a></h3>
<dl class="data">
<dt id="django.core.validators.validate_email">
<tt class="descname">validate_email</tt><a class="headerlink" href="#django.core.validators.validate_email" title="Permalink to this definition">¶</a></dt>
<dd><p>An <tt class="docutils literal"><span class="pre">EmailValidator</span></tt> instance that ensures a value looks like an
email address.</p>
</dd></dl>
</div>
<div class="section" id="s-validate-slug">
<span id="validate-slug"></span><h3><tt class="docutils literal"><span class="pre">validate_slug</span></tt><a class="headerlink" href="#validate-slug" title="Permalink to this headline">¶</a></h3>
<dl class="data">
<dt id="django.core.validators.validate_slug">
<tt class="descname">validate_slug</tt><a class="headerlink" href="#django.core.validators.validate_slug" title="Permalink to this definition">¶</a></dt>
<dd><p>A <a class="reference internal" href="#django.core.validators.RegexValidator" title="django.core.validators.RegexValidator"><tt class="xref py py-class docutils literal"><span class="pre">RegexValidator</span></tt></a> instance that ensures a value consists of only
letters, numbers, underscores or hyphens.</p>
</dd></dl>
</div>
<div class="section" id="s-validate-ipv4-address">
<span id="validate-ipv4-address"></span><h3><tt class="docutils literal"><span class="pre">validate_ipv4_address</span></tt><a class="headerlink" href="#validate-ipv4-address" title="Permalink to this headline">¶</a></h3>
<dl class="data">
<dt id="django.core.validators.validate_ipv4_address">
<tt class="descname">validate_ipv4_address</tt><a class="headerlink" href="#django.core.validators.validate_ipv4_address" title="Permalink to this definition">¶</a></dt>
<dd><p>A <a class="reference internal" href="#django.core.validators.RegexValidator" title="django.core.validators.RegexValidator"><tt class="xref py py-class docutils literal"><span class="pre">RegexValidator</span></tt></a> instance that ensures a value looks like an IPv4
address.</p>
</dd></dl>
</div>
<div class="section" id="s-validate-ipv6-address">
<span id="validate-ipv6-address"></span><h3><tt class="docutils literal"><span class="pre">validate_ipv6_address</span></tt><a class="headerlink" href="#validate-ipv6-address" title="Permalink to this headline">¶</a></h3>
<dl class="data">
<dt id="django.core.validators.validate_ipv6_address">
<tt class="descname">validate_ipv6_address</tt><a class="reference internal" href="../_modules/django/core/validators.html#validate_ipv6_address"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.core.validators.validate_ipv6_address" title="Permalink to this definition">¶</a></dt>
<dd><p>Uses <tt class="docutils literal"><span class="pre">django.utils.ipv6</span></tt> to check the validity of an IPv6 address.</p>
</dd></dl>
</div>
<div class="section" id="s-validate-ipv46-address">
<span id="validate-ipv46-address"></span><h3><tt class="docutils literal"><span class="pre">validate_ipv46_address</span></tt><a class="headerlink" href="#validate-ipv46-address" title="Permalink to this headline">¶</a></h3>
<dl class="data">
<dt id="django.core.validators.validate_ipv46_address">
<tt class="descname">validate_ipv46_address</tt><a class="reference internal" href="../_modules/django/core/validators.html#validate_ipv46_address"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.core.validators.validate_ipv46_address" title="Permalink to this definition">¶</a></dt>
<dd><p>Uses both <tt class="docutils literal"><span class="pre">validate_ipv4_address</span></tt> and <tt class="docutils literal"><span class="pre">validate_ipv6_address</span></tt> to
ensure a value is either a valid IPv4 or IPv6 address.</p>
</dd></dl>
</div>
<div class="section" id="s-validate-comma-separated-integer-list">
<span id="validate-comma-separated-integer-list"></span><h3><tt class="docutils literal"><span class="pre">validate_comma_separated_integer_list</span></tt><a class="headerlink" href="#validate-comma-separated-integer-list" title="Permalink to this headline">¶</a></h3>
<dl class="data">
<dt id="django.core.validators.validate_comma_separated_integer_list">
<tt class="descname">validate_comma_separated_integer_list</tt><a class="headerlink" href="#django.core.validators.validate_comma_separated_integer_list" title="Permalink to this definition">¶</a></dt>
<dd><p>A <a class="reference internal" href="#django.core.validators.RegexValidator" title="django.core.validators.RegexValidator"><tt class="xref py py-class docutils literal"><span class="pre">RegexValidator</span></tt></a> instance that ensures a value is a
comma-separated list of integers.</p>
</dd></dl>
</div>
<div class="section" id="s-maxvaluevalidator">
<span id="maxvaluevalidator"></span><h3><tt class="docutils literal"><span class="pre">MaxValueValidator</span></tt><a class="headerlink" href="#maxvaluevalidator" title="Permalink to this headline">¶</a></h3>
<dl class="class">
<dt id="django.core.validators.MaxValueValidator">
<em class="property">class </em><tt class="descname">MaxValueValidator</tt>(<em>max_value</em>)<a class="reference internal" href="../_modules/django/core/validators.html#MaxValueValidator"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.core.validators.MaxValueValidator" title="Permalink to this definition">¶</a></dt>
<dd><p>Raises a <a class="reference internal" href="exceptions.html#django.core.exceptions.ValidationError" title="django.core.exceptions.ValidationError"><tt class="xref py py-exc docutils literal"><span class="pre">ValidationError</span></tt></a> with a code of
<tt class="docutils literal"><span class="pre">'max_value'</span></tt> if <tt class="docutils literal"><span class="pre">value</span></tt> is greater than <tt class="docutils literal"><span class="pre">max_value</span></tt>.</p>
</dd></dl>
</div>
<div class="section" id="s-minvaluevalidator">
<span id="minvaluevalidator"></span><h3><tt class="docutils literal"><span class="pre">MinValueValidator</span></tt><a class="headerlink" href="#minvaluevalidator" title="Permalink to this headline">¶</a></h3>
<dl class="class">
<dt id="django.core.validators.MinValueValidator">
<em class="property">class </em><tt class="descname">MinValueValidator</tt>(<em>min_value</em>)<a class="reference internal" href="../_modules/django/core/validators.html#MinValueValidator"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.core.validators.MinValueValidator" title="Permalink to this definition">¶</a></dt>
<dd><p>Raises a <a class="reference internal" href="exceptions.html#django.core.exceptions.ValidationError" title="django.core.exceptions.ValidationError"><tt class="xref py py-exc docutils literal"><span class="pre">ValidationError</span></tt></a> with a code of
<tt class="docutils literal"><span class="pre">'min_value'</span></tt> if <tt class="docutils literal"><span class="pre">value</span></tt> is less than <tt class="docutils literal"><span class="pre">min_value</span></tt>.</p>
</dd></dl>
</div>
<div class="section" id="s-maxlengthvalidator">
<span id="maxlengthvalidator"></span><h3><tt class="docutils literal"><span class="pre">MaxLengthValidator</span></tt><a class="headerlink" href="#maxlengthvalidator" title="Permalink to this headline">¶</a></h3>
<dl class="class">
<dt id="django.core.validators.MaxLengthValidator">
<em class="property">class </em><tt class="descname">MaxLengthValidator</tt>(<em>max_length</em>)<a class="reference internal" href="../_modules/django/core/validators.html#MaxLengthValidator"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.core.validators.MaxLengthValidator" title="Permalink to this definition">¶</a></dt>
<dd><p>Raises a <a class="reference internal" href="exceptions.html#django.core.exceptions.ValidationError" title="django.core.exceptions.ValidationError"><tt class="xref py py-exc docutils literal"><span class="pre">ValidationError</span></tt></a> with a code of
<tt class="docutils literal"><span class="pre">'max_length'</span></tt> if the length of <tt class="docutils literal"><span class="pre">value</span></tt> is greater than <tt class="docutils literal"><span class="pre">max_length</span></tt>.</p>
</dd></dl>
</div>
<div class="section" id="s-minlengthvalidator">
<span id="minlengthvalidator"></span><h3><tt class="docutils literal"><span class="pre">MinLengthValidator</span></tt><a class="headerlink" href="#minlengthvalidator" title="Permalink to this headline">¶</a></h3>
<dl class="class">
<dt id="django.core.validators.MinLengthValidator">
<em class="property">class </em><tt class="descname">MinLengthValidator</tt>(<em>min_length</em>)<a class="reference internal" href="../_modules/django/core/validators.html#MinLengthValidator"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#django.core.validators.MinLengthValidator" title="Permalink to this definition">¶</a></dt>
<dd><p>Raises a <a class="reference internal" href="exceptions.html#django.core.exceptions.ValidationError" title="django.core.exceptions.ValidationError"><tt class="xref py py-exc docutils literal"><span class="pre">ValidationError</span></tt></a> with a code of
<tt class="docutils literal"><span class="pre">'min_length'</span></tt> if the length of <tt class="docutils literal"><span class="pre">value</span></tt> is less than <tt class="docutils literal"><span class="pre">min_length</span></tt>.</p>
</dd></dl>
</div>
</div>
</div>
</div>
</div>
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<h3><a href="../contents.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">Validators</a><ul>
<li><a class="reference internal" href="#writing-validators">Writing validators</a></li>
<li><a class="reference internal" href="#how-validators-are-run">How validators are run</a></li>
<li><a class="reference internal" href="#built-in-validators">Built-in validators</a><ul>
<li><a class="reference internal" href="#regexvalidator"><tt class="docutils literal"><span class="pre">RegexValidator</span></tt></a></li>
<li><a class="reference internal" href="#urlvalidator"><tt class="docutils literal"><span class="pre">URLValidator</span></tt></a></li>
<li><a class="reference internal" href="#validate-email"><tt class="docutils literal"><span class="pre">validate_email</span></tt></a></li>
<li><a class="reference internal" href="#validate-slug"><tt class="docutils literal"><span class="pre">validate_slug</span></tt></a></li>
<li><a class="reference internal" href="#validate-ipv4-address"><tt class="docutils literal"><span class="pre">validate_ipv4_address</span></tt></a></li>
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