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<div class="section" id="slave-okay-queries">
<h1>Slave Okay Queries<a class="headerlink" href="#slave-okay-queries" title="Permalink to this headline"></a></h1>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last"><code class="docutils literal"><span class="pre">slaveOkay</span></code> was deprecated in 1.2 - please use <a class="reference external" href="http://php.net/manual/en/mongo.readpreferences.php">Read Preference</a>
instead.</p>
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<div class="section" id="documents">
<h2>Documents<a class="headerlink" href="#documents" title="Permalink to this headline"></a></h2>
<p>You can configure an entire document to send all reads to the slaves by using the <code class="docutils literal"><span class="pre">slaveOkay</span></code> flag:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp">&lt;?php</span>
<span class="sd">/** @Document(slaveOkay=true) */</span>
<span class="k">class</span> <span class="nc">User</span>
<span class="p">{</span>
<span class="sd">/** @Id */</span>
<span class="k">private</span> <span class="nv">$id</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
<p>Now all reads involving the <code class="docutils literal"><span class="pre">User</span></code> document will be sent to a slave.</p>
</div>
<div class="section" id="queries">
<h2>Queries<a class="headerlink" href="#queries" title="Permalink to this headline"></a></h2>
<p>If you want to instruct individual queries to read from a slave you can use the <code class="docutils literal"><span class="pre">slaveOkay()</span></code> method
on the query builder.</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp">&lt;?php</span>
<span class="nv">$qb</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-&gt;</span><span class="na">createQueryBuilder</span><span class="p">(</span><span class="s1">&#39;User&#39;</span><span class="p">)</span>
<span class="o">-&gt;</span><span class="na">slaveOkay</span><span class="p">(</span><span class="k">true</span><span class="p">);</span>
<span class="nv">$query</span> <span class="o">=</span> <span class="nv">$qb</span><span class="o">-&gt;</span><span class="na">getQuery</span><span class="p">();</span>
<span class="nv">$users</span> <span class="o">=</span> <span class="nv">$query</span><span class="o">-&gt;</span><span class="na">execute</span><span class="p">();</span>
</pre></div>
</div>
<p>The data in the query above will be read from a slave. Even if you have a <code class="docutils literal"><span class="pre">&#64;ReferenceOne</span></code> or
<code class="docutils literal"><span class="pre">&#64;ReferenceMany</span></code> resulting from the query above it will be initialized and loaded from a slave.</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp">&lt;?php</span>
<span class="sd">/** @Document */</span>
<span class="k">class</span> <span class="nc">User</span>
<span class="p">{</span>
<span class="sd">/** @ReferenceMany(targetDocument=&quot;Account&quot;) */</span>
<span class="k">private</span> <span class="nv">$accounts</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
<p>Now when you query and iterate over the accounts, they will be loaded from a slave:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp">&lt;?php</span>
<span class="nv">$qb</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-&gt;</span><span class="na">createQueryBuilder</span><span class="p">(</span><span class="s1">&#39;User&#39;</span><span class="p">)</span>
<span class="o">-&gt;</span><span class="na">slaveOkay</span><span class="p">(</span><span class="k">true</span><span class="p">);</span>
<span class="nv">$query</span> <span class="o">=</span> <span class="nv">$qb</span><span class="o">-&gt;</span><span class="na">getQuery</span><span class="p">();</span>
<span class="nv">$users</span> <span class="o">=</span> <span class="nv">$query</span><span class="o">-&gt;</span><span class="na">execute</span><span class="p">();</span>
<span class="k">foreach</span> <span class="p">(</span><span class="nv">$users</span> <span class="k">as</span> <span class="nv">$user</span><span class="p">)</span> <span class="p">{</span>
<span class="k">foreach</span> <span class="p">(</span><span class="nv">$user</span><span class="o">-&gt;</span><span class="na">getAccounts</span><span class="p">()</span> <span class="k">as</span> <span class="nv">$account</span><span class="p">)</span> <span class="p">{</span>
<span class="k">echo</span> <span class="nv">$account</span><span class="o">-&gt;</span><span class="na">getName</span><span class="p">();</span>
<span class="p">}</span>
<span class="p">}</span>
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<h3><a href="../index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">Slave Okay Queries</a><ul>
<li><a class="reference internal" href="#documents">Documents</a></li>
<li><a class="reference internal" href="#queries">Queries</a></li>
</ul>
</li>
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