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<div class="section" id="implementing-wakeup-or-clone">
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<h1>Implementing Wakeup or Clone<a class="headerlink" href="#implementing-wakeup-or-clone" title="Permalink to this headline">¶</a></h1>
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<p><em>Section author: Roman Borschel (<a class="reference external" href="mailto:roman%40code-factory.org">roman<span>@</span>code-factory<span>.</span>org</a>)</em></p>
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<p>As explained in the
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<a class="reference internal" href="../reference/architecture.html"><span class="doc">restrictions for document classes in the manual</span></a>.
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it is usually not allowed for a document to implement <code class="docutils literal"><span class="pre">__wakeup</span></code>
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or <code class="docutils literal"><span class="pre">__clone</span></code>, because Doctrine makes special use of them.
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However, it is quite easy to make use of these methods in a safe
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way by guarding the custom wakeup or clone code with a document
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identity check, as demonstrated in the following sections.</p>
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<div class="section" id="safely-implementing-wakeup">
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<h2>Safely implementing __wakeup<a class="headerlink" href="#safely-implementing-wakeup" title="Permalink to this headline">¶</a></h2>
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<p>To safely implement <code class="docutils literal"><span class="pre">__wakeup</span></code>, simply enclose your
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implementation code in an identity check as follows:</p>
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<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
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<span class="k">class</span> <span class="nc">MyDocument</span>
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<span class="p">{</span>
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<span class="k">private</span> <span class="nv">$id</span><span class="p">;</span> <span class="c1">// This is the identifier of the document.</span>
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<span class="c1">//...</span>
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<span class="k">public</span> <span class="k">function</span> <span class="nf">__wakeup</span><span class="p">()</span>
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<span class="p">{</span>
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<span class="c1">// If the document has an identity, proceed as normal.</span>
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<span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">id</span><span class="p">)</span> <span class="p">{</span>
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<span class="c1">// ... Your code here as normal ...</span>
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<span class="p">}</span>
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<span class="c1">// otherwise do nothing, do NOT throw an exception!</span>
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<span class="p">}</span>
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<span class="c1">//...</span>
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<span class="p">}</span>
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</pre></div>
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</div>
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</div>
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<div class="section" id="safely-implementing-clone">
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<h2>Safely implementing __clone<a class="headerlink" href="#safely-implementing-clone" title="Permalink to this headline">¶</a></h2>
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<p>Safely implementing <code class="docutils literal"><span class="pre">__clone</span></code> is pretty much the same:</p>
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<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
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<span class="k">class</span> <span class="nc">MyDocument</span>
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<span class="p">{</span>
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<span class="k">private</span> <span class="nv">$id</span><span class="p">;</span> <span class="c1">// This is the identifier of the document.</span>
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<span class="c1">//...</span>
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<span class="k">public</span> <span class="k">function</span> <span class="nf">__clone</span><span class="p">()</span>
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<span class="p">{</span>
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<span class="c1">// If the document has an identity, proceed as normal.</span>
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<span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">id</span><span class="p">)</span> <span class="p">{</span>
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<span class="c1">// ... Your code here as normal ...</span>
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<span class="p">}</span>
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<span class="c1">// otherwise do nothing, do NOT throw an exception!</span>
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<span class="p">}</span>
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<span class="c1">//...</span>
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<span class="p">}</span>
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</pre></div>
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</div>
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</div>
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<div class="section" id="summary">
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<h2>Summary<a class="headerlink" href="#summary" title="Permalink to this headline">¶</a></h2>
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<p>As you have seen, it is quite easy to safely make use of
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<code class="docutils literal"><span class="pre">__wakeup</span></code> and <code class="docutils literal"><span class="pre">__clone</span></code> in your documents without adding any
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really Doctrine-specific or Doctrine-dependant code.</p>
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<p>These implementations are possible and safe because when Doctrine
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invokes these methods, the documents never have an identity (yet).
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Furthermore, it is possibly a good idea to check for the identity
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in your code anyway, since it's rarely the case that you want to
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unserialize or clone a document with no identity.</p>
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<h3><a href="../index.html">Table Of Contents</a></h3>
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<ul>
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<li><a class="reference internal" href="#">Implementing Wakeup or Clone</a><ul>
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<li><a class="reference internal" href="#safely-implementing-wakeup">Safely implementing __wakeup</a></li>
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<li><a class="reference internal" href="#safely-implementing-clone">Safely implementing __clone</a></li>
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<li><a class="reference internal" href="#summary">Summary</a></li>
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