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<li class="active"><a href="./">System Fields</a>
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<h4>This Page</h4>
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<ul class="toc">
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<li><a href="#hidden"><code>_hidden</code></a></li>
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<li><a href="#discoverable"><code>_discoverable</code></a></li>
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<li><a href="#model"><code>_model</code></a></li>
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<li><a href="#slug"><code>_slug</code></a></li>
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<li><a href="#template"><code>_template</code></a></li>
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<div class="col-sm-9 doc-styling">
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<h1>System Fields</h1>
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<ul class=page-meta>
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</ul>
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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.
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They can be easily recognized because they are prefixed by a leading underscore
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(<code>_</code>).</p>
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<p>These fields influence how Lektor treats pages and attachment. Here we will
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just go over the most important ones but for a full list you can have a look
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<a href="../../api/db/system-fields/" class="ref">at the API Documentation</a>.</p>
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<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
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page is hidden all of its children will automatically also be hidden. A page
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that is hidden will not be processed by Lektor's build system. This means such
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pages can be discovered through the query API but they are not rendered
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themselves. This is useful for situations where you want to have information
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stored but not rendered. This is for instance used to <a href="../../guides/single-page/" class="ref">implement Single-Page
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websites</a>.</p>
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<p><em>To read more read <a href="../../api/db/system-fields/hidden/" class="ref">the field documentation</a>.</em></p>
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<h2 id="discoverable"><code>_discoverable</code></h2><p>This fields in many ways is similar to <code>_hidden</code> but instead makes a page
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be only hidden from queries. In particular this means that it will still be
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processed and built, but that it becomes harder for code to reference it.
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Pages that are not set to discoverable can only be found through queries if
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they are <a href="../../api/db/query/include-undiscoverable/" class="ref">explicitly included</a>.</p>
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<div class="admonition admonition-info"><p>This field was added in Lektor 2.0. In earlier versions this feature is
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unavailable.</p></div><p><em>To read more read <a href="../../api/db/system-fields/discoverable/" class="ref">the field documentation</a>.</em></p>
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<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.
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If not set this defaults to one of different choices depending on configuration
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or name. Parent models can pre-define the model for children, which is then used if
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this key is not set. If not set this will be picked up by an algorithm.
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See <a href="../../models/selection/" class="ref">Default Model Selection</a> for more information.</p>
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<p><em>To learn more read <a href="../../api/db/system-fields/model/" class="ref">the field documentation</a>.</em></p>
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<h2 id="slug"><code>_slug</code></h2><p>This field can override the default URL slug. For more information about this
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feature see <a href="../urls/" class="ref">URLs and Slugs</a>.</p>
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<h2 id="template"><code>_template</code></h2><p>This field can be used to override the default template selection which is
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just the model name with the <code>.html</code> extension.</p>
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<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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