<p dir="auto">Use subqueries to do the selection in one go in the database which also avoids to deduplicate in rails.</p>
<p dir="auto">Also pushes all visibility filtering into the query.</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/openstreetmap/openstreetmap-website/pull/5636'>https://github.com/openstreetmap/openstreetmap-website/pull/5636</a></p>

<h4>Commit Summary</h4>
<ul>
  <li><a href="https://github.com/openstreetmap/openstreetmap-website/pull/5636/commits/ba481319f4c86528054c0490a0846ea7474c6612" class="commit-link">ba48131</a>  Use subqueries to find nested members more efficiently</li>
</ul>

<h4 style="display: inline-block">File Changes </h4> <p style="display: inline-block">(<a href="https://github.com/openstreetmap/openstreetmap-website/pull/5636/files">4 files</a>)</p>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5636/files#diff-d0c415c93927717bf92fd6ece85b5cc01c84f55b09f91d45cc551c240f3e3e5e">app/controllers/api/nodes/relations_controller.rb</a>
    (13)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5636/files#diff-ecbf28e16d58d55c7b9a4df33d04401e38b1828b2f728087917042fb76338556">app/controllers/api/nodes/ways_controller.rb</a>
    (8)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5636/files#diff-5f2d76d57a466f17519491f3061b6c6e5219538f115abc653ee6543ac0819b24">app/controllers/api/relations/relations_controller.rb</a>
    (13)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5636/files#diff-84fd18c1f9b0f3659dc02bf624c9e0928260921d92ebe3da82993a070e328088">app/controllers/api/ways/relations_controller.rb</a>
    (13)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/5636.patch'>https://github.com/openstreetmap/openstreetmap-website/pull/5636.patch</a></li>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/5636.diff'>https://github.com/openstreetmap/openstreetmap-website/pull/5636.diff</a></li>
</ul>

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