RethinkDB update and replace-without in one line

Question

Can anyone think if an elegant way to do update and replace in one line?

I want to use the r.row.without to remove fields and update at the same query.

Something like:

r.db('db').table('table').get('item_id')
          .update({ field_a:'value_a'})
          .replace(r.row.without(r.args(['field_b'])))`

simply chaining would be nice but this won't work (update returns a change result).

Answer 1

r.db('db').table('table').get('item_id')
    .replace(
        r.row.merge(
            function(doc){ 
                return {field_a: 'newval'}
            }
        ).without('field_b')
    )

Should do the trick