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<div class="col-md-8 col-md-offset-1">
<h3 id="nested-queries">Nested Queries</h3>
<p>We can nest all read operations at any level of the graph. Let’s say we wanted to
fetch all <code class="highlighter-rouge">Post</code>s and their <code class="highlighter-rouge">Comment</code>s…but only return comments that
are <code class="highlighter-rouge">active</code>, sorted by <code class="highlighter-rouge">created_at</code> descending. We can create a
<code class="highlighter-rouge">Comment</code> scope as normal, then <code class="highlighter-rouge">#merge()</code> it into our <code class="highlighter-rouge">Post</code> scope:</p>
<div class="tabs">
<div class="tab typescript active">
<span>Typescript</span>
</div>
<div class="tab javascript">
<span>Javascript</span>
</div>
</div>
<div class="code-tabs">
<figure class="highlight"><pre><code class="language-typescript" data-lang="typescript"><span class="kd">let</span> <span class="nx">commentScope</span> <span class="o">=</span> <span class="nx">Comment</span>
<span class="p">.</span><span class="nx">where</span><span class="p">({</span> <span class="na">active</span><span class="p">:</span> <span class="kc">true</span> <span class="p">})</span>
<span class="p">.</span><span class="nx">order</span><span class="p">({</span> <span class="na">created_at</span><span class="p">:</span> <span class="s2">"desc"</span> <span class="p">})</span>
<span class="nx">Post</span>
<span class="p">.</span><span class="nx">includes</span><span class="p">(</span><span class="s2">"comments"</span><span class="p">)</span>
<span class="p">.</span><span class="nx">merge</span><span class="p">({</span> <span class="na">comments</span><span class="p">:</span> <span class="nx">commentScope</span> <span class="p">})</span>
<span class="p">.</span><span class="nx">all</span><span class="p">()</span></code></pre></figure>
<figure class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kd">var</span> <span class="nx">commentScope</span> <span class="o">=</span> <span class="nx">Comment</span>
<span class="p">.</span><span class="nx">where</span><span class="p">({</span> <span class="na">active</span><span class="p">:</span> <span class="kc">true</span> <span class="p">})</span>
<span class="p">.</span><span class="nx">order</span><span class="p">({</span> <span class="na">created_at</span><span class="p">:</span> <span class="s2">"desc"</span> <span class="p">})</span>
<span class="nx">Post</span>
<span class="p">.</span><span class="nx">includes</span><span class="p">(</span><span class="s2">"comments"</span><span class="p">)</span>
<span class="p">.</span><span class="nx">merge</span><span class="p">({</span> <span class="na">comments</span><span class="p">:</span> <span class="nx">commentScope</span> <span class="p">})</span>
<span class="p">.</span><span class="nx">all</span><span class="p">()</span></code></pre></figure>
</div>
<blockquote class="url">
<p>/posts?include=comments&filter[comments][active]=true&sort=-comments.active</p>
</blockquote>
<p>Because this can get verbose, it’s often desirable to store it on
the class:</p>
<div class="tabs">
<div class="tab typescript active">
<span>Typescript</span>
</div>
<div class="tab javascript">
<span>Javascript</span>
</div>
</div>
<div class="code-tabs">
<figure class="highlight"><pre><code class="language-typescript" data-lang="typescript"><span class="kr">class</span> <span class="nx">Comment</span> <span class="k">extends</span> <span class="nx">ApplicationRecord</span> <span class="p">{</span>
<span class="c1">// ... code ...</span>
<span class="k">static</span> <span class="nx">recent</span><span class="p">()</span> <span class="p">{</span>
<span class="k">return</span> <span class="k">this</span>
<span class="p">.</span><span class="nx">where</span><span class="p">({</span> <span class="na">active</span><span class="p">:</span> <span class="kc">true</span> <span class="p">})</span>
<span class="p">.</span><span class="nx">order</span><span class="p">({</span> <span class="na">created_at</span><span class="p">:</span> <span class="s2">"desc"</span> <span class="p">})</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="nx">Post</span><span class="p">.</span><span class="nx">merge</span><span class="p">({</span> <span class="na">comments</span><span class="p">:</span> <span class="nx">Comment</span><span class="p">.</span><span class="nx">recent</span><span class="p">()</span> <span class="p">}).</span><span class="nx">all</span><span class="p">()</span></code></pre></figure>
<figure class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kr">const</span> <span class="nx">Comment</span> <span class="o">=</span> <span class="nx">ApplicationRecord</span><span class="p">.</span><span class="nx">extend</span><span class="p">({</span>
<span class="c1">// ... code ...</span>
<span class="na">static</span><span class="p">:</span> <span class="p">{</span>
<span class="na">recent</span><span class="p">:</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="k">return</span> <span class="k">this</span>
<span class="p">.</span><span class="nx">where</span><span class="p">({</span> <span class="na">active</span><span class="p">:</span> <span class="kc">true</span> <span class="p">})</span>
<span class="p">.</span><span class="nx">order</span><span class="p">({</span> <span class="na">created_at</span><span class="p">:</span> <span class="s2">"desc"</span> <span class="p">})</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">})</span>
<span class="nx">Post</span>
<span class="p">.</span><span class="nx">includes</span><span class="p">(</span><span class="s2">"comments"</span><span class="p">)</span>
<span class="p">.</span><span class="nx">merge</span><span class="p">({</span> <span class="na">comments</span><span class="p">:</span> <span class="nx">Comment</span><span class="p">.</span><span class="nx">recent</span><span class="p">()</span> <span class="p">})</span>
<span class="p">.</span><span class="nx">all</span><span class="p">()</span></code></pre></figure>
</div>
<p>Any number of scopes can be merged in. Just remember to <code class="highlighter-rouge">#include()</code>
and <code class="highlighter-rouge">#merge()</code> relationship names <strong>as the server understands them</strong>:</p>
<div class="tabs">
<div class="tab typescript active">
<span>Typescript</span>
</div>
<div class="tab javascript">
<span>Javascript</span>
</div>
</div>
<div class="code-tabs">
<figure class="highlight"><pre><code class="language-typescript" data-lang="typescript"><span class="kr">class</span> <span class="nx">Dog</span> <span class="k">extends</span> <span class="nx">ApplicationRecord</span> <span class="p">{</span>
<span class="err">@</span><span class="nx">BelongsTo</span><span class="p">()</span> <span class="nx">person</span><span class="err">:</span> <span class="nx">Person</span>
<span class="p">}</span>
<span class="c1">// We've modeled this as Dog > person in javascript</span>
<span class="c1">// And Person is jsonapiType "people"</span>
<span class="c1">// But the server defined the relationship as "owner"</span>
<span class="nx">Dog</span><span class="p">.</span><span class="nx">includes</span><span class="p">(</span><span class="s2">"owner"</span><span class="p">).</span><span class="nx">merge</span><span class="p">({</span> <span class="na">owner</span><span class="p">:</span> <span class="nx">Person</span><span class="p">.</span><span class="nx">limitedFields</span><span class="p">()</span> <span class="p">})</span></code></pre></figure>
<figure class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kr">const</span> <span class="nx">Dog</span> <span class="o">=</span> <span class="nx">ApplicationRecord</span><span class="p">.</span><span class="nx">extend</span><span class="p">({</span>
<span class="c1">// ... code ...</span>
<span class="na">methods</span><span class="p">:</span> <span class="p">{</span>
<span class="na">person</span><span class="p">:</span> <span class="nx">belongsTo</span><span class="p">()</span>
<span class="p">}</span>
<span class="p">})</span>
<span class="c1">// We've modeled this as Dog > person in javascript</span>
<span class="c1">// And Person is jsonapiType "people"</span>
<span class="c1">// But the server defined the relationship as "owner"</span>
<span class="nx">Dog</span><span class="p">.</span><span class="nx">includes</span><span class="p">(</span><span class="s2">"owner"</span><span class="p">).</span><span class="nx">merge</span><span class="p">({</span> <span class="na">owner</span><span class="p">:</span> <span class="nx">Person</span><span class="p">.</span><span class="nx">limitedFields</span><span class="p">()</span> <span class="p">})</span></code></pre></figure>
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