title: flutter: how to read geohash and geopoint from firestore
body: <p>The following is the way I saved user's <code>geohash</code> and <code>geopoint</code> in firestore.</p>
  <p><a href="https://i.stack.imgur.com/TIaz1.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TIaz1.png" alt="enter image description here" /></a></p>
  <p>For example, if I want to read field <code>intro</code>, I write this way;</p>
  <pre><code>FirebaseFirestore.instance.collection('...').doc(..).data()['intro']
  </code></pre>
  <p>But I don't know how to read <code>geohash</code> and <code>geopoint</code> from firestore. <code>geohash</code> is inside a map, and <code>geopoint</code> is an array inside a map. How do you retrieve <code>geohash</code> and <code>geopoint</code> from my firestore?</p>