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Move path converter docs into a separate section #9524

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Sep 10, 2024
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Move path converter docs into a separate section #9524

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38 changes: 19 additions & 19 deletions docs/api-guide/routers.md
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Expand Up @@ -142,6 +142,24 @@ The above example would now generate the following URL pattern:
* URL path: `^users/{pk}/change-password/$`
* URL name: `'user-change_password'`

### Using Django `path()` with routers

By default, the URLs created by routers use regular expressions. This behavior can be modified by setting the `use_regex_path` argument to `False` when instantiating the router, in this case [path converters][path-converters-topic-reference] are used. For example:

router = SimpleRouter(use_regex_path=False)

The router will match lookup values containing any characters except slashes and period characters. For a more restrictive (or lenient) lookup pattern, set the `lookup_value_regex` attribute on the viewset or `lookup_value_converter` if using path converters. For example, you can limit the lookup to valid UUIDs:

class MyModelViewSet(mixins.RetrieveModelMixin, viewsets.GenericViewSet):
lookup_field = 'my_model_id'
lookup_value_regex = '[0-9a-f]{32}'

class MyPathModelViewSet(mixins.RetrieveModelMixin, viewsets.GenericViewSet):
lookup_field = 'my_model_uuid'
lookup_value_converter = 'uuid'

Note that path converters will be used on all URLs registered in the router, including viewset actions.

# API Guide

## SimpleRouter
Expand All @@ -160,30 +178,13 @@ This router includes routes for the standard set of `list`, `create`, `retrieve`
<tr><td>{prefix}/{lookup}/{url_path}/</td><td>GET, or as specified by `methods` argument</td><td>`@action(detail=True)` decorated method</td><td>{basename}-{url_name}</td></tr>
</table>

By default the URLs created by `SimpleRouter` are appended with a trailing slash.
By default, the URLs created by `SimpleRouter` are appended with a trailing slash.
This behavior can be modified by setting the `trailing_slash` argument to `False` when instantiating the router. For example:

router = SimpleRouter(trailing_slash=False)

Trailing slashes are conventional in Django, but are not used by default in some other frameworks such as Rails. Which style you choose to use is largely a matter of preference, although some javascript frameworks may expect a particular routing style.

By default the URLs created by `SimpleRouter` use regular expressions. This behavior can be modified by setting the `use_regex_path` argument to `False` when instantiating the router, in this case [path converters][path-converters-topic-reference] are used. For example:

router = SimpleRouter(use_regex_path=False)

**Note**: `use_regex_path=False` only works with Django 2.x or above, since this feature was introduced in 2.0.0. See [release note][simplified-routing-release-note]


The router will match lookup values containing any characters except slashes and period characters. For a more restrictive (or lenient) lookup pattern, set the `lookup_value_regex` attribute on the viewset or `lookup_value_converter` if using path converters. For example, you can limit the lookup to valid UUIDs:

class MyModelViewSet(mixins.RetrieveModelMixin, viewsets.GenericViewSet):
lookup_field = 'my_model_id'
lookup_value_regex = '[0-9a-f]{32}'

class MyPathModelViewSet(mixins.RetrieveModelMixin, viewsets.GenericViewSet):
lookup_field = 'my_model_uuid'
lookup_value_converter = 'uuid'

## DefaultRouter

This router is similar to `SimpleRouter` as above, but additionally includes a default API root view, that returns a response containing hyperlinks to all the list views. It also generates routes for optional `.json` style format suffixes.
Expand Down Expand Up @@ -351,5 +352,4 @@ The [`DRF-extensions` package][drf-extensions] provides [routers][drf-extensions
[drf-extensions-customizable-endpoint-names]: https://chibisov.github.io/drf-extensions/docs/#controller-endpoint-name
[url-namespace-docs]: https://docs.djangoproject.com/en/4.0/topics/http/urls/#url-namespaces
[include-api-reference]: https://docs.djangoproject.com/en/4.0/ref/urls/#include
[simplified-routing-release-note]: https://docs.djangoproject.com/en/2.0/releases/2.0/#simplified-url-routing-syntax
[path-converters-topic-reference]: https://docs.djangoproject.com/en/2.0/topics/http/urls/#path-converters
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