title: Emit one List item at a time from a Flowable
body: <p>I have a method which returns a <code>Flowable&lt;RealmResults&lt;MyClass&gt;&gt;</code>. For those not familiar with Realm, <code>RealmResults</code> is just a simple <code>List</code> of items.</p>
  
  <p>Given a <code>Flowable&lt;RealmResults&lt;MyClass&gt;&gt;</code>, I'd like to emit each <code>MyClass</code> item so that I can perform a <code>map()</code> operation on each item.</p>
  
  <p>I am looking for something like the following:</p>
  
  <pre><code>getItems() // returns a Flowable&lt;RealmResults&lt;MyClass&gt;&gt;
      .emitOneAtATime() // Example operator
      .map(obj -&gt; obj + "")
      // etc
  </code></pre>
  
  <p>What operator will emit each List item sequentially?</p>