  
  
  class ManyPrimaryKeyRelatedField(ManyRelatedField):
      """
      Serializes a to-many related field or related manager to a pk value.
      """
      def to_native(self, pk):
          return pk
  
      def field_to_native(self, obj, field_name):
 
</s> remove     Serializes a related field or related object to a pk value.
 </s> add     Represents a to-one relationship as a pk value. </s> remove         # TODO: Make this mandatory, and have the HyperlinkedModelSerializer
        # set it on-the-fly
 </s> add         # TODO: Make view_name mandatory, and have the
        # HyperlinkedModelSerializer set it on-the-fly
    Represents a to-many relationship as a pk value.
  
  
  class ManyPrimaryKeyRelatedField(ManyRelatedField):
      """
    Represents a to-many relationship as a pk value.
      """
      def to_native(self, pk):
          return pk
  
      def field_to_native(self, obj, field_name):
keep keep keep keep replace keep keep keep keep keep
 Relational field support in browseable API.

Add slug relational fields.
Add quickstart. 
rest_framework/fields.py