  
  class ManyRelatedField(ManyRelatedMixin, RelatedField):
      """
      Base class for related model managers.
      """
      pass
  
  
 
</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     Serializes a to-many related field or related manager to a pk value.
 </s> add     Represents a to-many relationship as a pk value.
    If not overridden, this represents a to-many relatinship, using the unicode
    representations of the target, and is read-only.
  
  class ManyRelatedField(ManyRelatedMixin, RelatedField):
      """
      Base class for related model managers.
    If not overridden, this represents a to-many relatinship, using the unicode
    representations of the target, and is read-only.
      """
      pass
  
  
keep keep keep add keep keep keep keep
 Relational field support in browseable API.

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