Document extra action method mapping

docs/api-guide/settings.md

@@ -398,10 +398,15 @@ A string representing the function that should be used when generating view name
 
 This should be a function with the following signature:
 
-    view_name(cls, suffix=None)
+    view_name(self)
 
-* `cls`: The view class.  Typically the name function would inspect the name of the class when generating a descriptive name, by accessing `cls.__name__`.
-* `suffix`: The optional suffix used when differentiating individual views in a viewset.
+* `self`: The view instance.  Typically the name function would inspect the name of the class when generating a descriptive name, by accessing `self.__class__.__name__`.
+
+If the view instance inherits `ViewSet`, it may have been initialized with several optional arguments:
+
+* `name`: A name expliticly provided to a view in the viewset. Typically, this value should be used as-is when provided.
+* `suffix`: Text used when differentiating individual views in a viewset. This argument is mutually exclusive to `name`.
+* `detail`: Boolean that differentiates an individual view in a viewset as either being a 'list' or 'detail' view.
 
 Default: `'rest_framework.views.get_view_name'`
 
@@ -413,11 +418,15 @@ This setting can be changed to support markup styles other than the default mark
 
 This should be a function with the following signature:
 
-    view_description(cls, html=False)
+    view_description(self, html=False)
 
-* `cls`: The view class.  Typically the description function would inspect the docstring of the class when generating a description, by accessing `cls.__doc__`
+* `self`: The view instance.  Typically the description function would inspect the docstring of the class when generating a description, by accessing `self.__class__.__doc__`
 * `html`: A boolean indicating if HTML output is required.  `True` when used in the browsable API, and `False` when used in generating `OPTIONS` responses.
 
+If the view instance inherits `ViewSet`, it may have been initialized with several optional arguments:
+
+* `description`: A description explicitly provided to the view in the viewset. Typically, this is set by extra viewset `action`s, and should be used as-is.
+
 Default: `'rest_framework.views.get_view_description'`
 
 ## HTML Select Field cutoffs

docs/api-guide/viewsets.md

@@ -110,6 +110,8 @@ During dispatch, the following attributes are available on the `ViewSet`.
 * `action` - the name of the current action (e.g., `list`, `create`).
 * `detail` - boolean indicating if the current action is configured for a list or detail view.
 * `suffix` - the display suffix for the viewset type - mirrors the `detail` attribute.
+* `name` - the display name for the viewset. This argument is mutually exclusive to `suffix`.
+* `description` - the display description for the individual view of a viewset.
 
 You may inspect these attributes to adjust behaviour based on the current action. For example, you could restrict permissions to everything except the `list` action similar to this:
 
@@ -142,7 +144,7 @@ A more complete example of extra actions:
         queryset = User.objects.all()
         serializer_class = UserSerializer
 
-        @action(methods=['post'], detail=True)
+        @action(detail=True, methods=['post'])
         def set_password(self, request, pk=None):
             user = self.get_object()
             serializer = PasswordSerializer(data=request.data)
@@ -168,13 +170,13 @@ A more complete example of extra actions:
 
 The decorator can additionally take extra arguments that will be set for the routed view only.  For example:
 
-        @action(methods=['post'], detail=True, permission_classes=[IsAdminOrIsSelf])
+        @action(detail=True, methods=['post'], permission_classes=[IsAdminOrIsSelf])
         def set_password(self, request, pk=None):
            ...
 
 These decorator will route `GET` requests by default, but may also accept other HTTP methods by setting the `methods` argument.  For example:
 
-        @action(methods=['post', 'delete'], detail=True)
+        @action(detail=True, methods=['post', 'delete'])
         def unset_password(self, request, pk=None):
            ...
 
@@ -182,6 +184,22 @@ The two new actions will then be available at the urls `^users/{pk}/set_password
 
 To view all extra actions, call the `.get_extra_actions()` method.
 
+### Routing additional HTTP methods for extra actions
+
+Extra actions can be mapped to different `ViewSet` methods. For example, the above password set/unset methods could be consolidated into a single route. Note that additional mappings do not accept arguments.
+
+```python
+    @action(detail=True, methods=['put'], name='Change Password')
+    def password(self, request, pk=None):
+        """Update the user's password."""
+        ...
+
+    @password.mapping.delete
+    def delete_password(self, request, pk=None):
+        """Delete the user's password."""
+        ...
+```
+
 ## Reversing action URLs
 
 If you need to get the URL of an action, use the `.reverse_action()` method. This is a convenience wrapper for `reverse()`, automatically passing the view's `request` object and prepending the `url_name` with the `.basename` attribute.