title: How to lookup for nested property?
body: <p>Let's say i have 2 collections</p>
  <pre><code>// Post collection:
  {
      &quot;_id&quot;: &quot;post1&quot;,
      &quot;title&quot;: &quot;Some title&quot;
  }
  
  </code></pre>
  <pre><code>// User collection:
  
  {
      &quot;_id&quot;: &quot;user1&quot;,
      &quot;posts&quot;: {
          &quot;voted&quot;: [
              {
                   &quot;_id&quot;: &quot;post1&quot;,
                   &quot;vote&quot;: 3
              },
              {
                   &quot;_id&quot;: &quot;post2&quot;,
                   &quot;vote&quot;: 2
              }
          ]
      }
  }
  </code></pre>
  <p>And i need to get this result:</p>
  <pre><code>{
      &quot;_id&quot;: &quot;post1&quot;,
      &quot;title&quot;: &quot;Some title&quot;,
      &quot;voted&quot;: 3
  }
  </code></pre>
  <p>How can i make a request with <strong>aggregation</strong>, which will display this output ?</p>
  <p>Here what i've tried: <a href="https://mongoplayground.net/p/oeKpVHo0uRe" rel="nofollow noreferrer">https://mongoplayground.net/p/oeKpVHo0uRe</a></p>