title: Querying subcollections in Firestore using Flutter
body: <p>I am trying to take all records from sub collection in Firestore. </p>
  
  <p>Below is my table structure.</p>
  
  <p><img src="https://i.stack.imgur.com/1x8RC.png" alt="Database screenshot attached"></p>
  
  <p>Restaurants (Main table) --> RestaurantID (document) --> Reviews(Collection) --> ReviewID (document) --> multiple review details with their own uniqueID and will also have reviewDate field.</p>
  
  <p>What I am trying to achieve is I want to list all reviews written on particular date. </p>
  
  <p>If I pass <code>RestaurantID</code> then I am getting records but how to get all records without passing <code>RestaurantID</code>?</p>
  
  <p>Is this possible to achieve in my current table structure? Or must I change it?</p>