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<title>System Fields | Documentation | Lektor Static Content Management System</title>
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<h4>This Page</h4>
<ul class="toc">
<li><a href="#hidden"><code>_hidden</code></a></li>
<li><a href="#discoverable"><code>_discoverable</code></a></li>
<li><a href="#model"><code>_model</code></a></li>
<li><a href="#slug"><code>_slug</code></a></li>
<li><a href="#template"><code>_template</code></a></li>
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<h1>System Fields</h1>
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<p>In addition to the fields that are defined through the <a href="../../models/" class="ref">Data Model</a> there are a lot of fields that come directly from Lektor.
They can be easily recognized because they are prefixed by a leading underscore
(<code>_</code>).</p>
<p>These fields influence how Lektor treats pages and attachment. Here we will
just go over the most important ones but for a full list you can have a look
<a href="../../api/db/system-fields/" class="ref">at the API Documentation</a>.</p>
<h2 id="hidden"><code>_hidden</code></h2><p>This field is a boolean value and controls if a page is hidden or not. If a
page is hidden all of its children will automatically also be hidden. A page
that is hidden will not be processed by Lektor's build system. This means such
pages can be discovered through the query API but they are not rendered
themselves. This is useful for situations where you want to have information
stored but not rendered. This is for instance used to <a href="../../guides/single-page/" class="ref">implement Single-Page
websites</a>.</p>
<p><em>To read more read <a href="../../api/db/system-fields/hidden/" class="ref">the field documentation</a>.</em></p>
<h2 id="discoverable"><code>_discoverable</code></h2><p>This fields in many ways is similar to <code>_hidden</code> but instead makes a page
be only hidden from queries. In particular this means that it will still be
processed and built, but that it becomes harder for code to reference it.
Pages that are not set to discoverable can only be found through queries if
they are <a href="../../api/db/query/include-undiscoverable/" class="ref">explicitly included</a>.</p>
<div class="admonition admonition-info"><p>This field was added in Lektor 2.0. In earlier versions this feature is
unavailable.</p></div><p><em>To read more read <a href="../../api/db/system-fields/discoverable/" class="ref">the field documentation</a>.</em></p>
<h2 id="model"><code>_model</code></h2><p>This key sets the <a href="../../models/" class="ref">Data Model</a> that is used for the record.
If not set this defaults to one of different choices depending on configuration
or name. Parent models can pre-define the model for children, which is then used if
this key is not set. If not set this will be picked up by an algorithm.
See <a href="../../models/selection/" class="ref">Default Model Selection</a> for more information.</p>
<p><em>To learn more read <a href="../../api/db/system-fields/model/" class="ref">the field documentation</a>.</em></p>
<h2 id="slug"><code>_slug</code></h2><p>This field can override the default URL slug. For more information about this
feature see <a href="../urls/" class="ref">URLs and Slugs</a>.</p>
<h2 id="template"><code>_template</code></h2><p>This field can be used to override the default template selection which is
just the model name with the <code>.html</code> extension.</p>
<p><em>To learn more read <a href="../../api/db/system-fields/template/" class="ref">the field documentation</a>.</em></p>
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