title: Confused when delivering PrimaryKeyRelatedField to the Client
body: <p>If you extract the value of the field used as PrimaryKeyRelatedField, you will see the value in the form of Object, not PK.</p>
  <p>In the case of the official document, I am using it as below, but it is confusing when using it with the client.</p>
  <p>I don't know if the tracks will contain id or Object just by looking at the field name.</p>
  <pre class="lang-py prettyprint-override"><code>class AlbumSerializer(serializers.ModelSerializer):
      tracks = serializers.PrimaryKeyRelatedField(many=True, read_only=True)
  
      class Meta:
          model = Album
          fields = ['tracks']
      
          def create(self, validated_data):
                  tracks = validated_data.pop('tracks')  # [Track, Track ...]
  </code></pre>
  <p>Is there a better way?</p>