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HTML
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<li class="active"><a href="./">Children & Pagination</a>
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<li><a href="../selection/">Default Model Selection</a>
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<h4>This Page</h4>
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<ul class="toc">
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<li><a href="#child-configuration">Child Configuration</a></li>
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<li><a href="#child-slug-behavior">Child Slug Behavior</a></li>
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<li><a href="#pagination">Pagination</a></li>
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</div>
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<div class="col-sm-9 doc-styling">
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<h1>Children & Pagination</h1>
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<ul class=page-meta>
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</ul>
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<p>By default each model can have child pages. This is what enables the
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hierarchical structure of the Lektor database. Children are configured
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together with a model that encloses it. This is typically called the
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“collection model”. For instance you can have a collection model called
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<code>pages</code> which is the parent to a few <code>page</code> children.</p>
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<h2 id="child-configuration">Child Configuration</h2><p>Most configuration related to child pages goes into <code>[children]</code>. It
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configures how children of the model should be handled. In particular it
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controls if a page can have children to begin with, if the children can be of
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any format or have to match specific models and more.</p>
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<p>Here are the most important options below <code>[children]</code>:</p>
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<ul>
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<li><code>enabled</code>: this can enable or disable children. The default is that a
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page can have children.</li>
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<li><code>slug_format</code>: this key controls the URL key for children. By default
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the URL key is the ID of the page. However in some cases you might
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want to change that. For instance blog-posts might want to pull in
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parts of the date into the URL. This is a template expression.</li>
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<li><code>model</code>: if this is set to a string, then all children are automatically
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forced to the same model and the UI will not give a way to select a
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model when creating a new child page. This allows specific parts of
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the website to use the correct models automatically. For instance you
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can force all pages below <code>/projects</code> to use the <code>project</code> model.</li>
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<li><code>order_by</code>: a comma separated list of fields that indicate the default
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sort order. If a field is prefixed with a minus sign, the order is
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inversed.</li>
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<li><code>replaced_with</code>: this allows a page to simulate that it has children
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when it really has not. This can be a query expression and the result
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is then used as the children of the model. This for instance can be
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used to implement categories with filtering.</li>
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<li><code>hidden</code>: if this is set it can override the parent's hidden flag for
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all children. This is particularly useful if you want to have a folder
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for error pages or other special pages where the parent itself should not
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be rendered but all children are. The default is not set.</li>
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</ul>
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<div class="admonition admonition-info"><p>The <code>hidden</code> flag was added in Lektor 2.0</p></div><h2 id="child-slug-behavior">Child Slug Behavior</h2><p>Slugs are the URL paths or more correctly: parts of it. The URL paths
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always are the concatenation from the parent's page URL path plus the
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children's slug. If not configured the default slug of children is the
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page's <code>_id</code>. A slug can contain slashes to navigate into folders. This
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also allows pages to overlap into other pages. For instance if you have
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a model called <code>categories</code> which is used by a folder named <code>categories/</code>,
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that folder could set the <code>_slug</code> to <code>blog/categories</code> and then the URL
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for categories would be <code>blog/categories/example</code> instead of
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<code>categories/example</code>.</p>
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<p>The default slug can be changed with the <code>slug_format</code> parameter in the
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<code>[children]</code> section which can be a template expression. For instance a
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common way to format slugs would be to include some date components. What's
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important about this is that the slug expression must not fail even if fields
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are empty! This is necessary because new pages will start out with the
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fields not being filled in.</p>
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<p>This for instance includes a date in the URL if set:</p>
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<div class="highlight"><pre><span></span><span class="na">slug_format</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">{{ (this.date|dateformat('YYYY/M/') if this.date) ~ this._id }}</span><span class="w"></span>
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</pre></div>
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<h2 id="pagination">Pagination</h2><p>In general a source document renders into a single page. The exception to
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that rule are pages with children which show the children on the rendered
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page and have pagination enabled. In that case it becomes possible to
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slide the range of children into smaller pieces and render those slides
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instead.</p>
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<p>Pagination is controlled from the <code>[pagination]</code> section. The following
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keys are available:</p>
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<ul>
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<li><code>enabled</code>: if set to <code>yes</code> pagination becomes enabled. It's off by
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default.</li>
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<li><code>per_page</code>: this controls how many children are shown per page. If
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pagination is enabled and this is not set, an implicit default of <code>20</code>
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is assumed.</li>
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<li><code>items</code>: if this is set to a query then the pagination's items will be
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overridden by it. This can be used to make the pagination work over a
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subset of items.</li>
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</ul>
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<p>If pagination is enabled then the <a href="../../api/db/record/pagination/" class="ref">pagination attribute</a> of a record becomes available. For
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more information have a look at the <a href="../../guides/pagination/" class="ref">pagination guide</a>.</p>
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<div class="admonition admonition-info"><p>The <code>items</code> property was added in Lektor 2.0</p></div>
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