420 lines
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420 lines
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HTML
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<title>Pad | Documentation | Lektor Static Content Management System</title>
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<li><a href="../../../">Welcome</a></li>
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<li><a href="../../../what/">What is Lektor</a>
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<li><a href="../../../installation/">Installation</a>
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<li><a href="../../">API</a>
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<ul>
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<li><a href="../../build/">Build System</a>
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<li><a href="../../databags/">Databags</a>
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<li><a href="../">Database</a>
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<ul>
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<li><a href="../asset/">Asset</a>
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<li><a href="../types/">Builtin Field Types</a>
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<li><a href="../expression/">Expression</a>
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<li><a href="../f/">F</a>
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<li><a href="../get-alts/">get_alts()</a>
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<li class="active"><a href="./">Pad</a>
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<ul>
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<li><a href="databags/">databags</a>
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<li><a href="get/">get()</a>
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<li><a href="get-root/">get_root()</a>
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<li><a href="query/">query()</a>
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<li><a href="resolve-url-path/">resolve_url_path()</a>
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<li><a href="root/">root</a>
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</ul>
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<li><a href="../query/">Query</a>
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<li><a href="../record/">Record</a>
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<li><a href="../obj/">SourceObject</a>
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<li><a href="../system-fields/">System Fields</a>
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<li><a href="../type/">Type</a>
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</ul>
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<li><a href="../../environment/">Environment</a>
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<li><a href="../../plugins/">Plugins</a>
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<li><a href="../../project/">Project</a>
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<li><a href="../../publisher/">Publisher</a>
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<li><a href="../../templates/">Template API</a>
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<li><a href="../../utils/">Utilities</a>
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<li><a href="../../../search/">Search</a>
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</ul>
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<div class="visible-md-block visible-lg-block">
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<h4>This Page</h4>
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<ul class="toc">
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<li><a href="#template-usage">Template Usage</a></li>
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<li><a href="#plugin-usage">Plugin Usage</a></li>
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<li><a href="#manual-pad-creation">Manual Pad Creation</a></li>
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</ul>
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</div>
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</div>
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<div class="col-sm-9 doc-styling">
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<h1><i class="glyphicon glyphicon-leaf"></i> <code class="mod">lektor.db.</code><code class="obj">Pad</code></h1>
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<ul class=page-meta>
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<li>Template variable: <a href="../../templates/globals/site/"><code>site</code></a></li>
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</ul>
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<p>The <code>Pad</code> is a helper class that provides basic access to querying the
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database. Inside templates an instance of it is available under the
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<code>site</code> variable automatically.</p>
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<p>To understand what the pad does you need to consider what it is. The
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pad is similar to a <code>connection</code> in a regular database. Whenever you
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load a record it's temporarily cached on the pad. So unless you overflow
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the cache, loading the object a second time will most likely return an
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already loaded instance from the pad. This also means that the pad
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is not threadsafe. So if you want (for whatever reason) use multiple
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threads you have to create a separate pad for each thread.</p>
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<p>This typically only comes up in the context of plugins or more complex
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command line scripts.</p>
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<h2 id="template-usage">Template Usage</h2><p>A ready-configured pad is always available under the <code>site</code> name which
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allows you to easily discover other pages. Here is a basic example of
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how to do this through the <a href="get/" class="ref">get</a> method:</p>
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<div class="hll"><pre><span></span><span class="cp">{%</span> <span class="k">set</span> <span class="nv">root</span> <span class="o">=</span> <span class="nv">site.get</span><span class="o">(</span><span class="s1">'/'</span><span class="o">)</span> <span class="cp">%}</span>
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<span class="p"><</span><span class="nt">title</span><span class="p">></span><span class="cp">{{</span> <span class="nv">this.title</span> <span class="cp">}}</span> | <span class="cp">{{</span> <span class="nv">root.title</span> <span class="cp">}}</span><span class="p"></</span><span class="nt">title</span><span class="p">></span>
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</pre></div>
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<h2 id="plugin-usage">Plugin Usage</h2><p>Within plugins it's typically not a good idea to construct a new Pad.
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Instead you can get access to the current pad from the active context:</p>
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<div class="hll"><pre><span></span><span class="kn">from</span> <span class="nn">lektor.context</span> <span class="kn">import</span> <span class="n">get_ctx</span>
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<span class="n">ctx</span> <span class="o">=</span> <span class="n">get_ctx</span><span class="p">()</span>
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<span class="k">if</span> <span class="n">ctx</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
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<span class="n">pad</span> <span class="o">=</span> <span class="n">get_ctx</span><span class="p">()</span><span class="o">.</span><span class="n">pad</span>
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</pre></div>
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<p>Note that you can only get access to a pad if a context is available. This
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will not be the case when the plugin is currently being initialized for
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instance.</p>
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<h2 id="manual-pad-creation">Manual Pad Creation</h2><p>If you want to work with the database from a script, you can create a
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pad from the <a href="../../environment/" class="ref">Environment</a> with the help of
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the <a href="../../environment/new-pad/" class="ref">new_pad</a> method:</p>
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<div class="hll"><pre><span></span><span class="kn">from</span> <span class="nn">lektor.project</span> <span class="kn">import</span> <span class="n">Project</span>
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<span class="n">project</span> <span class="o">=</span> <span class="n">Project</span><span class="o">.</span><span class="n">discover</span><span class="p">()</span>
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<span class="n">env</span> <span class="o">=</span> <span class="n">project</span><span class="o">.</span><span class="n">make_env</span><span class="p">()</span>
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<span class="n">pad</span> <span class="o">=</span> <span class="n">env</span><span class="o">.</span><span class="n">new_pad</span><span class="p">()</span>
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<span class="n">root_record</span> <span class="o">=</span> <span class="n">pad</span><span class="o">.</span><span class="n">root</span>
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</pre></div>
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<div class="child-pages nocontent">
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<div class="row">
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<div class="col-md-6 child">
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<h4>
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<i class="glyphicon glyphicon-info-sign"></i>
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<a href="databags/">databags</a>
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</h4>
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<p class="summary">Provides access to the databags system.</p>
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</div>
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<div class="col-md-6 child">
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<h4>
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<i class="glyphicon glyphicon-cog"></i>
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<a href="get/">get()</a>
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</h4>
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<p class="summary">Loads a single record.</p>
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</div>
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</div>
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<div class="row">
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<div class="col-md-6 child">
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<h4>
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<i class="glyphicon glyphicon-cog"></i>
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<a href="get-root/">get_root()</a>
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</h4>
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<p class="summary">Returns the root object of a specific alternative.</p>
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</div>
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<div class="col-md-6 child">
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<h4>
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<i class="glyphicon glyphicon-cog"></i>
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<a href="query/">query()</a>
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</h4>
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<p class="summary">Creates a query at a specific path.</p>
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</div>
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</div>
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<div class="row">
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<div class="col-md-6 child">
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<h4>
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<i class="glyphicon glyphicon-cog"></i>
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<a href="resolve-url-path/">resolve_url_path()</a>
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</h4>
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<p class="summary">Resolves a URL path to a into a source object.</p>
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</div>
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<div class="col-md-6 child">
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<h4>
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<i class="glyphicon glyphicon-info-sign"></i>
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<a href="root/">root</a>
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</h4>
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<p class="summary">Returns the root object of the primary alternative.</p>
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</div>
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