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<h4>This Page</h4>
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<li><a href="#example">Example</a></li>
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<div class="col-sm-9 doc-styling">
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<h1><i class="glyphicon glyphicon-cog"></i> <code class="obj">virtualpathresolver</code> <span class="sig">(<code>prefix</code>)</span></h1>
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<ul class=page-meta>
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<li>Method of <a href="../">Environment</a></li>
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<li>New in Lektor Version <em>2.0</em></li>
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</ul>
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<p>When implementing <a href="../../db/obj/" class="ref">Virtual Source Objects</a> it's important
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that you can locate them. While virtual sources do not appear as children of
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pages they can be navigated to through the database pad. This is achieved
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through custom virtual path resolvers.</p>
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<p>Each source object needs to be a unique prefix which identifies all instances
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of it. For instance if you want to implement a special page (like a feed)
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that would exist for specific pages, then you can register the virtual path
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prefix <code>feed</code> with your plugin. Though you should use more descriptive names
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for your plugins as these paths are shared.</p>
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<p>If a user then resolves the page <code>/my-page@feed</code> it would invoke your URL
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resolver with the record <code>my-page</code> and an empty list (rest of the path
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segments). If they would request <code>/my-page@feed/recent</code> then it would
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pass <code>['recent']</code> as path segments.</p>
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<h2 id="example">Example</h2><p>Here an example that would implement a virtual source for feeds and an
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associated virtual path resolver:</p>
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<div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">lektor.sourceobj</span> <span class="kn">import</span> <span class="n">VirtualSourceObject</span>
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<span class="kn">from</span> <span class="nn">lektor.utils</span> <span class="kn">import</span> <span class="n">build_url</span>
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<span class="k">class</span> <span class="nc">Feed</span><span class="p">(</span><span class="n">VirtualSourceObject</span><span class="p">):</span>
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<span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">record</span><span class="p">,</span> <span class="n">version</span><span class="o">=</span><span class="s1">'default'</span><span class="p">):</span>
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<span class="n">VirtualSourceObject</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">record</span><span class="p">)</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">version</span> <span class="o">=</span> <span class="n">version</span>
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<span class="nd">@property</span>
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<span class="k">def</span> <span class="nf">path</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
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<span class="k">return</span> <span class="s1">'</span><span class="si">%s</span><span class="s1">@feed</span><span class="si">%s</span><span class="s1">'</span> <span class="o">%</span> <span class="p">(</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">record</span><span class="o">.</span><span class="n">path</span><span class="p">,</span>
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<span class="s1">'/'</span> <span class="o">+</span> <span class="bp">self</span><span class="o">.</span><span class="n">version</span> <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">version</span> <span class="o">!=</span> <span class="s1">'default'</span> <span class="k">else</span> <span class="s1">''</span><span class="p">,</span>
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<span class="p">)</span>
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<span class="nd">@property</span>
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<span class="k">def</span> <span class="nf">url_path</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
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<span class="k">return</span> <span class="n">build_url</span><span class="p">([</span><span class="bp">self</span><span class="o">.</span><span class="n">record</span><span class="o">.</span><span class="n">url_path</span><span class="p">,</span> <span class="s1">'feed.xml'</span><span class="p">])</span>
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<span class="k">def</span> <span class="nf">on_setup_env</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">**</span><span class="n">extra</span><span class="p">):</span>
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<span class="nd">@self</span><span class="o">.</span><span class="n">env</span><span class="o">.</span><span class="n">virtualpathresolver</span><span class="p">(</span><span class="s1">'feed'</span><span class="p">)</span>
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<span class="k">def</span> <span class="nf">resolve_virtual_path</span><span class="p">(</span><span class="n">record</span><span class="p">,</span> <span class="n">pieces</span><span class="p">):</span>
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<span class="k">if</span> <span class="ow">not</span> <span class="n">pieces</span><span class="p">:</span>
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<span class="k">return</span> <span class="n">Feed</span><span class="p">(</span><span class="n">record</span><span class="p">)</span>
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<span class="k">elif</span> <span class="n">pieces</span> <span class="o">==</span> <span class="p">[</span><span class="s1">'recent'</span><span class="p">]:</span>
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<span class="k">return</span> <span class="n">Feed</span><span class="p">(</span><span class="n">record</span><span class="p">,</span> <span class="n">version</span><span class="o">=</span><span class="s1">'recent'</span><span class="p">)</span>
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</pre></div>
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