title: Firebase Firestore - OR query
body: <p>How to get data by multiple values of one field? For example, I have database with posts and I want to query for all posts where blogId is 1 or 2, sorting by timestamp. </p>
  
  <pre><code>collection("posts").whereEqualTo("blogId", "1")
  .whereEqualTo("blogId", 2).orderBy("timestamp", Query.Direction.DESCENDING).limit(50)
  </code></pre>
  
  <p>Code above is not working :(</p>
  
  <p>How to achieve this?
  Regards :)</p>