firebase, how to update data at a key
<p>I have some difficulties in updating an object at a bucket (key). 
At the time of persistence, I <code>push()</code> a list of objects (in this case, Trip) to a node. 
Later, I retrieved it, and make an update (in this case, updating the bid info) when a button is clicked. I can't seem to find an easy way to do that, unless when I had pushed the trip before, I had to manually call <code>getkey()</code> and then update the auto-generated uid to the object Trip itself. Any idea to get it done easily? thanks</p>

<pre><code>mFirebaseAdapter = new FirebaseRecyclerAdapter&lt;Trip,
            TripViewHolder&gt;(
            Trip.class,
            R.layout.item_message,
            TripViewHolder.class,
            mFirebaseDatabaseReference.child(CHILD_TRIPS)) {

        @Override
        protected void populateViewHolder(TripViewHolder viewHolder, final Trip model, int position) {

            viewHolder.btnTakeNow.setOnClickListener(new View.OnClickListener() {
                 @Override
                 public void onClick(View v) {

                     Bid bidAtReserved = new Bid(mDriverCarInfo, model, MY_PRICE);

                     mFirebaseDatabaseReference.child(CHILD_TRIPS)
                             //here, I want to update the bidding to this trip, but 
                             //I can't get the uid of the trip, unless I had 
                             //manually recorded at the time of pushing the trip
                             .child(model.getUid()) 
                              .child("bids").push().setValue(bidAtReserved);


                 }
            });
        }
    };
</code></pre>