title: how to create firebase recyclerview for list inside another list
body: <p>so i am trying with this application and the database looks something like that 
  <a href="https://i.stack.imgur.com/hsxfV.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hsxfV.png" alt="enter image description here"></a></p>
  
  <p>i successfuly grabed that data that is child to <code>mental</code> and i created recyclerview with it(description,endedat,startedat,title)</p>
  
  <p>so how can i create a recyclerview from the list inside each item list 
  <a href="https://i.stack.imgur.com/YgHgI.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/YgHgI.png" alt="enter image description here"></a></p>
  
  <p>what i could get is only the child pushed key by using</p>
  
  <pre><code>FirebaseDatabase.getInstance().getReference().child("records").child(FirebaseAuth.getInstance().getCurrentUser().getUid()).child("mental).orderByKey().addChildEventListener(new ChildEventListener() {
                  @Override
                  public void onChildAdded(DataSnapshot dataSnapshot, String s) {
                      Iterator&lt;DataSnapshot&gt;i = dataSnapshot.getChildren().iterator();
                      if(i.hasNext()){
                          Log.v("keys",i.next().getKey());
                      }
                  }
  </code></pre>
  
  <p>beside i tried to add an array of corrisponding class in viewholder but didnt work too</p>