title: How to access the value of a map field in cloud_firestore
body: <p>I am using cloud_firestore: ^0.8.2+2 - I am trying to access a <strong>map field</strong> on a document called "entity" with a key value pair. The key = "id" and the value = "1" . </p>
  
  <p>I have tried using the following syntax <code>documents[index].data['entity.id']</code> - unsuccessfully. </p>
  
  <p>I have successfully accessed a non map field title using the following syntax. <code>documents[index].data['title'].toString()</code></p>
  
  <p>Any help would be greatly appreciated.</p>
  
  <p><a href="https://i.stack.imgur.com/qMDln.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/qMDln.png" alt="Firebase Database Structure"></a></p>
  
  <p><a href="https://i.stack.imgur.com/ySL7Y.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ySL7Y.png" alt="Extract of Code"></a></p>