title: Why doesn't this Nested Serializer(ForeignKey) work?
body: <pre><code>class RFIDReaderSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = RFIDReader
          bind_state_choice = ProductEntityStateChoiceSerializer()
          # depth = 2
          fields = (
              &quot;url&quot;, &quot;pk&quot;, &quot;reader_name&quot;, &quot;reader_host&quot;, &quot;reader_address&quot;, &quot;reader_ip&quot;, &quot;reader_port&quot;,
              &quot;bind_state_choice&quot;,
              &quot;bind_state_location&quot;
          )
  </code></pre>
  <p><a href="https://i.stack.imgur.com/Joovd.png" rel="nofollow noreferrer">Serializer</a></p>
  <p><a href="https://i.stack.imgur.com/yZEXA.png" rel="nofollow noreferrer">Nested Serializer</a></p>
  <p><a href="https://i.stack.imgur.com/gspFi.png" rel="nofollow noreferrer">Model Graph</a></p>
  <p><a href="https://i.stack.imgur.com/mW1ai.png" rel="nofollow noreferrer">RestFul</a></p>