title: Google Firestore Querying Document in a Collection inside Document
body: <p>My data is formatted as follows:</p>
  
  <p>A collection of Documents C</p>
  
  <pre><code>----Document A
  
  -------Date Field
  
  -------Collection 
  
  -----------User Document
  
  ----Document B
  
  ...
  </code></pre>
  
  <p>How would I be able to query the database for all documents in c based on the dat field in each document AND if in each respective document a certain user is in their collection field using swift</p>