feat: allow extensions to add url views (#1025)

* feat: allow extensions to add url views

* refactor: fix linter errors

CHANGELOG.md

@@ -9,7 +9,8 @@
     - Hook into lifecycle events of django-components
     - Pre-/post-process component inputs, outputs, and templates
     - Add extra methods or attributes to Components
-    - Add custom CLI commands to django-components
+    - Add custom extension-specific CLI commands
+    - Add custom extension-specific URL routes
 
     Read more on [Extensions](https://django-components.github.io/django-components/0.131/concepts/advanced/extensions/).
 

docs/concepts/advanced/extensions.md

@@ -15,10 +15,10 @@ Extensions can be set by either as an import string or by passing in a class:
 ```python
 # settings.py
 
-class MyExtension(ComponentsExtension):
+class MyExtension(ComponentExtension):
     name = "my_extension"
 
-    class ExtensionClass(BaseExtensionClass):
+    class ExtensionClass(ComponentExtension.ExtensionClass):
         ...
 
 COMPONENTS = ComponentsSettings(
@@ -188,13 +188,13 @@ This is how extensions define the "default" behavior of their nested extension c
 For example, the `View` base extension class defines the handlers for GET, POST, etc:
 
 ```python
-from django_components.extension import ComponentExtension, BaseExtensionClass
+from django_components.extension import ComponentExtension
 
 class ViewExtension(ComponentExtension):
     name = "view"
 
     # The default behavior of the `View` extension class.
-    class ExtensionClass(BaseExtensionClass):
+    class ExtensionClass(ComponentExtension.ExtensionClass):
         def get(self, request):
             return self.component.get(request)
 
@@ -229,7 +229,7 @@ class MyTable(Component):
 
 !!! warning
 
-    When writing an extension, the `ExtensionClass` MUST subclass the base class [`BaseExtensionClass`](../../../reference/api/#django_components.ComponentExtension.BaseExtensionClass).
+    When writing an extension, the `ExtensionClass` MUST subclass the base class [`ComponentExtension.ExtensionClass`](../../../reference/api/#django_components.ComponentExtension.ExtensionClass).
 
     This base class ensures that the extension class will have access to the component instance.
 
@@ -276,7 +276,7 @@ from django_components.extension import (
     OnComponentInputContext,
 )
 
-class ColorLoggerExtensionClass(BaseExtensionClass):
+class ColorLoggerExtensionClass(ComponentExtension.ExtensionClass):
     color: str
 
 
@@ -356,7 +356,7 @@ This subclass should define:
 - `handle` - the logic to execute when the command is run
 
 ```python
-from django_components import ComponentCommand, ComponentsExtension
+from django_components import ComponentCommand, ComponentExtension
 
 class HelloCommand(ComponentCommand):
     name = "hello"
@@ -365,7 +365,7 @@ class HelloCommand(ComponentCommand):
     def handle(self, *args, **kwargs):
         print("Hello, world!")
 
-class MyExt(ComponentsExtension):
+class MyExt(ComponentExtension):
     name = "my_ext"
     commands = [HelloCommand]
 ```
@@ -382,7 +382,7 @@ as keyword arguments to the [`handle`](../../../reference/api#django_components.
 method of the command.
 
 ```python
-from django_components import CommandArg, ComponentCommand, ComponentsExtension
+from django_components import CommandArg, ComponentCommand, ComponentExtension
 
 class HelloCommand(ComponentCommand):
     name = "hello"
@@ -443,7 +443,7 @@ to provide better organization and help messages.
 Read more on [argparse argument groups](https://docs.python.org/3/library/argparse.html#argument-groups).
 
 ```python
-from django_components import CommandArg, CommandArgGroup, ComponentCommand, ComponentsExtension
+from django_components import CommandArg, CommandArgGroup, ComponentCommand, ComponentExtension
 
 class HelloCommand(ComponentCommand):
     name = "hello"
@@ -502,7 +502,7 @@ attribute of the extension, you define them in the
 attribute of the parent command:
 
 ```python
-from django_components import CommandArg, CommandArgGroup, ComponentCommand, ComponentsExtension
+from django_components import CommandArg, CommandArgGroup, ComponentCommand, ComponentExtension
 
 class ChildCommand(ComponentCommand):
     name = "child"
@@ -612,3 +612,128 @@ def test_hello_command(self):
     output = out.getvalue()
     assert output == "Hello, John!\n"
 ```
+
+## Extension URLs
+
+Extensions can define custom views and endpoints that can be accessed through the Django application.
+
+To define URLs for an extension, set them in the [`urls`](../../../reference/api#django_components.ComponentExtension.urls) attribute of your [`ComponentExtension`](../../../reference/api#django_components.ComponentExtension) class. Each URL is defined using the [`URLRoute`](../../../reference/api#django_components.URLRoute) class, which specifies the path, handler, and optional name for the route.
+
+Here's an example of how to define URLs within an extension:
+
+```python
+from django_components.extension import ComponentExtension, URLRoute
+from django.http import HttpResponse
+
+def my_view(request):
+    return HttpResponse("Hello from my extension!")
+
+class MyExtension(ComponentExtension):
+    name = "my_extension"
+
+    urls = [
+        URLRoute(path="my-view/", handler=my_view, name="my_view"),
+        URLRoute(path="another-view/<int:id>/", handler=my_view, name="another_view"),
+    ]
+```
+
+!!! warning
+
+    The [`URLRoute`](../../../reference/api#django_components.URLRoute) objects
+    are different from objects created with Django's
+    [`django.urls.path()`](https://docs.djangoproject.com/en/5.1/ref/urls/#path).
+    Do NOT use `URLRoute` objects in Django's [`urlpatterns`](https://docs.djangoproject.com/en/5.1/topics/http/urls/#example)
+    and vice versa!
+
+    django-components uses a custom [`URLRoute`](../../../reference/api#django_components.URLRoute) class to define framework-agnostic routing rules.
+
+    As of v0.131, `URLRoute` objects are directly converted to Django's `URLPattern` and `URLResolver` objects.
+
+### Accessing Extension URLs
+
+The URLs defined in an extension are available under the path
+
+```
+/components/ext/<extension_name>/
+```
+
+For example, if you have defined a URL with the path `my-view/<str:name>/` in an extension named `my_extension`, it can be accessed at:
+
+```
+/components/ext/my_extension/my-view/john/
+```
+
+### Nested URLs
+
+Extensions can also define nested URLs to allow for more complex routing structures.
+
+To define nested URLs, set the [`children`](../../../reference/api#django_components.URLRoute.children)
+attribute of the [`URLRoute`](../../../reference/api#django_components.URLRoute) object to
+a list of child [`URLRoute`](../../../reference/api#django_components.URLRoute) objects:
+
+```python
+class MyExtension(ComponentExtension):
+    name = "my_extension"
+
+    urls = [
+        URLRoute(
+            path="parent/",
+            name="parent_view",
+            children=[
+                URLRoute(path="child/<str:name>/", handler=my_view, name="child_view"),
+            ],
+        ),
+    ]
+```
+
+In this example, the URL
+
+```
+/components/ext/my_extension/parent/child/john/
+```
+
+would call the `my_view` handler with the parameter `name` set to `"John"`.
+
+### Passing kwargs and other extra fields to URL routes
+
+The [`URLRoute`](../../../reference/api#django_components.URLRoute) class is framework-agnostic,
+so that extensions could be used with non-Django frameworks in the future.
+
+However, that means that there may be some extra fields that Django's
+[`django.urls.path()`](https://docs.djangoproject.com/en/5.1/ref/urls/#path)
+accepts, but which are not defined on the `URLRoute` object.
+
+To address this, the [`URLRoute`](../../../reference/api#django_components.URLRoute) object has
+an [`extra`](../../../reference/api#django_components.URLRoute.extra) attribute,
+which is a dictionary that can be used to pass any extra kwargs to `django.urls.path()`:
+
+```python
+URLRoute(
+    path="my-view/<str:name>/",
+    handler=my_view,
+    name="my_view",
+    extra={"kwargs": {"foo": "bar"} },
+)
+```
+
+Is the same as:
+
+```python
+django.urls.path(
+    "my-view/<str:name>/",
+    view=my_view,
+    name="my_view",
+    kwargs={"foo": "bar"},
+)
+```
+
+because `URLRoute` is converted to Django's route like so:
+
+```python
+django.urls.path(
+    route.path,
+    view=route.handler,
+    name=route.name,
+    **route.extra,
+)
+```

docs/reference/api.md

@@ -35,6 +35,10 @@
     options:
       show_if_no_docstring: true
 
+::: django_components.ComponentCommand
+    options:
+      show_if_no_docstring: true
+
 ::: django_components.ComponentExtension
     options:
       show_if_no_docstring: true
@@ -63,10 +67,6 @@
     options:
       show_if_no_docstring: true
 
-::: django_components.ComponentCommand
-    options:
-      show_if_no_docstring: true
-
 ::: django_components.ComponentsSettings
     options:
       show_if_no_docstring: true
@@ -147,6 +147,14 @@
     options:
       show_if_no_docstring: true
 
+::: django_components.URLRoute
+    options:
+      show_if_no_docstring: true
+
+::: django_components.URLRouteHandler
+    options:
+      show_if_no_docstring: true
+
 ::: django_components.autodiscover
     options:
       show_if_no_docstring: true
@@ -182,4 +190,3 @@
 ::: django_components.template_tag
     options:
       show_if_no_docstring: true
-

docs/reference/commands.md

@@ -51,7 +51,9 @@ python manage.py components ext run <extension> <command>
 ## `components create`
 
 ```txt
-usage: python manage.py components create [-h] [--path PATH] [--js JS] [--css CSS] [--template TEMPLATE] [--force] [--verbose] [--dry-run] name
+usage: python manage.py components create [-h] [--path PATH] [--js JS] [--css CSS] [--template TEMPLATE] [--force] [--verbose]
+              [--dry-run]
+              name
 
 ```
 
@@ -293,7 +295,7 @@ Each extension can add its own commands, which will be available to run with thi
 For example, if you define and install the following extension:
 
 ```python
-from django_components ComponentCommand, ComponentsExtension
+from django_components import ComponentCommand, ComponentExtension
 
 class HelloCommand(ComponentCommand):
     name = "hello"
@@ -301,7 +303,7 @@ class HelloCommand(ComponentCommand):
     def handle(self, *args, **kwargs):
         print("Hello, world!")
 
-class MyExt(ComponentsExtension):
+class MyExt(ComponentExtension):
     name = "my_ext"
     commands = [HelloCommand]
 ```
@@ -315,7 +317,7 @@ python manage.py components ext run my_ext hello
 You can also define arguments for the command, which will be passed to the command's `handle` method.
 
 ```python
-from django_components import CommandArg, ComponentCommand, ComponentsExtension
+from django_components import CommandArg, ComponentCommand, ComponentExtension
 
 class HelloCommand(ComponentCommand):
     name = "hello"
@@ -349,14 +351,15 @@ python manage.py components ext run my_ext hello --name John --shout
 ## `upgradecomponent`
 
 ```txt
-usage: upgradecomponent [-h] [--path PATH] [--version] [-v {0,1,2,3}] [--settings SETTINGS] [--pythonpath PYTHONPATH]
+usage: upgradecomponent [-h] [--path PATH] [--version] [-v {0,1,2,3}] [--settings SETTINGS]
-                        [--traceback] [--no-color] [--force-color] [--skip-checks]
+                        [--pythonpath PYTHONPATH] [--traceback] [--no-color] [--force-color]
+                        [--skip-checks]
 
 ```
 
 
 
-<a href="https://github.com/django-components/django-components/tree/master/src/django_components/management/commands/upgradecomponent.py#L83" target="_blank">See source code</a>
+<a href="https://github.com/django-components/django-components/tree/master/src/django_components/management/commands/upgradecomponent.py#L89" target="_blank">See source code</a>
 
 
 
@@ -394,16 +397,17 @@ Deprecated. Use `components upgrade` instead.
 ## `startcomponent`
 
 ```txt
-usage: startcomponent [-h] [--path PATH] [--js JS] [--css CSS] [--template TEMPLATE] [--force] [--verbose] [--dry-run]
+usage: startcomponent [-h] [--path PATH] [--js JS] [--css CSS] [--template TEMPLATE] [--force]
-                      [--version] [-v {0,1,2,3}] [--settings SETTINGS] [--pythonpath PYTHONPATH] [--traceback]
+                      [--verbose] [--dry-run] [--version] [-v {0,1,2,3}] [--settings SETTINGS]
-                      [--no-color] [--force-color] [--skip-checks]
+                      [--pythonpath PYTHONPATH] [--traceback] [--no-color] [--force-color]
+                      [--skip-checks]
                       name
 
 ```
 
 
 
-<a href="https://github.com/django-components/django-components/tree/master/src/django_components/management/commands/startcomponent.py#L83" target="_blank">See source code</a>
+<a href="https://github.com/django-components/django-components/tree/master/src/django_components/management/commands/startcomponent.py#L89" target="_blank">See source code</a>
 
 
 

docs/reference/template_tags.md

@@ -67,7 +67,7 @@ If you insert this tag multiple times, ALL JS scripts will be duplicately insert
 
 
 
-<a href="https://github.com/django-components/django-components/tree/master/src/django_components/templatetags/component_tags.py#L1573" target="_blank">See source code</a>
+<a href="https://github.com/django-components/django-components/tree/master/src/django_components/templatetags/component_tags.py#L1478" target="_blank">See source code</a>
 
 
 
@@ -175,7 +175,7 @@ can access only the data that was explicitly passed to it:
 
 
 
-<a href="https://github.com/django-components/django-components/tree/master/src/django_components/templatetags/component_tags.py#L612" target="_blank">See source code</a>
+<a href="https://github.com/django-components/django-components/tree/master/src/django_components/templatetags/component_tags.py#L614" target="_blank">See source code</a>
 
 
 
@@ -416,7 +416,7 @@ user = self.inject("user_data")["user"]
 
 
 
-<a href="https://github.com/django-components/django-components/tree/master/src/django_components/templatetags/component_tags.py#L153" target="_blank">See source code</a>
+<a href="https://github.com/django-components/django-components/tree/master/src/django_components/templatetags/component_tags.py#L155" target="_blank">See source code</a>
 
 
 

src/django_components/__init__.py

@@ -53,6 +53,7 @@ from django_components.tag_formatter import (
 from django_components.template import cached_template
 import django_components.types as types
 from django_components.util.loader import ComponentFileEntry, get_component_dirs, get_component_files
+from django_components.util.routing import URLRoute, URLRouteHandler
 from django_components.util.types import EmptyTuple, EmptyDict
 
 # isort: on
@@ -113,4 +114,6 @@ __all__ = [
     "TagResult",
     "template_tag",
     "types",
+    "URLRoute",
+    "URLRouteHandler",
 ]

src/django_components/commands/ext_run.py

@@ -55,7 +55,7 @@ class ExtRunCommand(ComponentCommand):
     For example, if you define and install the following extension:
 
     ```python
-    from django_components ComponentCommand, ComponentsExtension
+    from django_components import ComponentCommand, ComponentExtension
 
     class HelloCommand(ComponentCommand):
         name = "hello"
@@ -63,7 +63,7 @@ class ExtRunCommand(ComponentCommand):
         def handle(self, *args, **kwargs):
             print("Hello, world!")
 
-    class MyExt(ComponentsExtension):
+    class MyExt(ComponentExtension):
         name = "my_ext"
         commands = [HelloCommand]
     ```
@@ -77,7 +77,7 @@ class ExtRunCommand(ComponentCommand):
     You can also define arguments for the command, which will be passed to the command's `handle` method.
 
     ```python
-    from django_components import CommandArg, ComponentCommand, ComponentsExtension
+    from django_components import CommandArg, ComponentCommand, ComponentExtension
 
     class HelloCommand(ComponentCommand):
         name = "hello"

src/django_components/compat/django.py

@@ -1,8 +1,10 @@
 from argparse import ArgumentParser
-from typing import Any, Optional, Type
+from typing import Any, List, Optional, Type
 
 import django
+import django.urls as django_urls
 from django.core.management.base import BaseCommand as DjangoCommand
+from django.urls import URLPattern
 
 from django_components.util.command import (
     CommandArg,
@@ -10,6 +12,11 @@ from django_components.util.command import (
     _setup_command_arg,
     setup_parser_from_command,
 )
+from django_components.util.routing import URLRoute
+
+################################################
+# COMMANDS
+################################################
 
 # Django command arguments added to all commands
 # NOTE: Many of these MUST be present for the command to work with Django
@@ -114,3 +121,44 @@ def load_as_django_command(command: Type[ComponentCommand]) -> Type[DjangoComman
     Command.__doc__ = command.__doc__
 
     return Command
+
+
+################################################
+# ROUTING
+################################################
+
+
+def routes_to_django(routes: List[URLRoute]) -> List[URLPattern]:
+    """
+    Convert a list of `URLRoute` objects to a list of `URLPattern` objects.
+
+    The result is similar to Django's `django.urls.path()` function.
+
+    Nested routes are recursively converted to Django with `django.urls.include()`.
+
+    **Example:**
+
+    ```python
+    urls_to_django([
+        URLPattern(
+            "/my/path",
+            handler=my_handler,
+            name="my_name",
+            extra={"kwargs": {"my_extra": "my_value"} },
+        ),
+    ])
+    ```
+    """
+    django_routes: List[URLPattern] = []
+    for route in routes:
+        # The handler is equivalent to `view` function in Django
+        if route.handler is not None:
+            django_handler = route.handler
+        else:
+            # If the URL has children paths, it's equivalent to "including" another `urlpatterns` in Django
+            subpaths = routes_to_django(route.children)
+            django_handler = django_urls.include(subpaths)
+
+        django_route = django_urls.path(route.path, django_handler, name=route.name, **route.extra)
+        django_routes.append(django_route)
+    return django_routes

src/django_components/component.py

@@ -111,7 +111,7 @@ CssDataType = TypeVar("CssDataType", bound=Mapping[str, Any])
 
 # NOTE: `ReferenceType` is NOT a generic pre-3.9
 if sys.version_info >= (3, 9):
-    AllComponents = List[ReferenceType["ComponentRegistry"]]
+    AllComponents = List[ReferenceType["Component"]]
 else:
     AllComponents = List[ReferenceType]
 

src/django_components/extension.py

@@ -1,11 +1,15 @@
 from functools import wraps
 from typing import TYPE_CHECKING, Any, Callable, Dict, List, NamedTuple, Tuple, Type, TypeVar
 
+import django.urls
 from django.template import Context
+from django.urls import URLResolver
 
 from django_components.app_settings import app_settings
+from django_components.compat.django import routes_to_django
 from django_components.util.command import ComponentCommand
 from django_components.util.misc import snake_to_pascal
+from django_components.util.routing import URLRoute
 
 if TYPE_CHECKING:
     from django_components import Component
@@ -93,6 +97,11 @@ class OnComponentDataContext(NamedTuple):
     """Dictionary of CSS data from `Component.get_css_data()`"""
 
 
+################################################
+# EXTENSIONS CORE
+################################################
+
+
 class BaseExtensionClass:
     def __init__(self, component: "Component") -> None:
         self.component = component
@@ -178,7 +187,7 @@ class ComponentExtension:
 
     ```python
     class MyComp(Component):
-        class MyExtension(BaseExtensionClass):
+        class MyExtension(ComponentExtension.ExtensionClass):
             ...
     ```
 
@@ -244,6 +253,8 @@ class ComponentExtension:
     ```
     """
 
+    urls: List[URLRoute] = []
+
     def __init_subclass__(cls) -> None:
         if not cls.name.isidentifier():
             raise ValueError(f"Extension name must be a valid Python identifier, got {cls.name}")
@@ -562,6 +573,12 @@ class ExtensionManager:
             extension_instance = used_ext_class(component)
             setattr(component, extension.name, extension_instance)
 
+    def _init_app(self) -> None:
+        if self._initialized:
+            return
+
+        self._initialized = True
+
         # The triggers for following hooks may occur before the `apps.py` `ready()` hook is called.
         # - on_component_class_created
         # - on_component_class_deleted
@@ -576,12 +593,6 @@ class ExtensionManager:
         # we store these "events" in a list, and then "flush" them all when `ready()` is called.
         #
         # This way, we can ensure that all extensions are present before any hooks are called.
-    def _init_app(self) -> None:
-        if self._initialized:
-            return
-
-        self._initialized = True
-
         for hook, data in self._events:
             if hook == "on_component_class_created":
                 on_component_created_data: OnComponentClassCreatedContext = data
@@ -589,6 +600,24 @@ class ExtensionManager:
             getattr(self, hook)(data)
         self._events = []
 
+        # Populate the `urlpatterns` with URLs specified by the extensions
+        # TODO_V3 - Django-specific logic - replace with hook
+        urls: List[URLResolver] = []
+        for extension in self.extensions:
+            ext_urls = routes_to_django(extension.urls)
+            ext_url_path = django.urls.path(f"{extension.name}/", django.urls.include(ext_urls))
+            urls.append(ext_url_path)
+
+        # NOTE: `urlconf_name` is the actual source of truth that holds either a list of URLPatterns
+        # or an import string thereof.
+        # However, Django's `URLResolver` caches the resolved value of `urlconf_name`
+        # under the key `url_patterns`.
+        # So we set both:
+        # - `urlconf_name` to update the source of truth
+        # - `url_patterns` to override the caching
+        ext_url_resolver.urlconf_name = urls
+        ext_url_resolver.url_patterns = urls
+
     def get_extension(self, name: str) -> ComponentExtension:
         for extension in self.extensions:
             if extension.name == name:
@@ -651,3 +680,25 @@ class ExtensionManager:
 
 # NOTE: This is a singleton which is takes the extensions from `app_settings.EXTENSIONS`
 extensions = ExtensionManager()
+
+
+################################
+# VIEW
+################################
+
+# Extensions can define their own URLs, which will be added to the `urlpatterns` list.
+# These will be available under the `/components/ext/<extension_name>/` path, e.g.:
+# `/components/ext/my_extension/path/to/route/<str:name>/<int:id>/`
+urlpatterns = [
+    django.urls.path("ext/", django.urls.include([])),
+]
+
+# NOTE: Normally we'd pass all the routes introduced by extensions to `django.urls.include()` and
+#       `django.urls.path()` to construct the `URLResolver` objects that would take care of the rest.
+#
+#       However, Django's `urlpatterns` are constructed BEFORE the `ready()` hook is called,
+#       and so before the extensions are ready.
+#
+#       As such, we lazily set the extensions' routes to the `URLResolver` object. And we use the `include()
+#       and `path()` funtions above to ensure that the `URLResolver` object is created correctly.
+ext_url_resolver: URLResolver = urlpatterns[0]

src/django_components/extensions/view.py

@@ -3,7 +3,7 @@ from typing import TYPE_CHECKING, Any, Protocol, cast
 from django.http import HttpRequest, HttpResponse
 from django.views.generic import View
 
-from django_components.extension import BaseExtensionClass, ComponentExtension
+from django_components.extension import ComponentExtension
 
 if TYPE_CHECKING:
     from django_components.component import Component
@@ -13,7 +13,7 @@ class ViewFn(Protocol):
     def __call__(self, request: HttpRequest, *args: Any, **kwargs: Any) -> Any: ...  # noqa: E704
 
 
-class ComponentView(BaseExtensionClass, View):
+class ComponentView(ComponentExtension.ExtensionClass, View):  # type: ignore
     """
     Subclass of `django.views.View` where the `Component` instance is available
     via `self.component`.
@@ -24,7 +24,7 @@ class ComponentView(BaseExtensionClass, View):
     component = cast("Component", None)
 
     def __init__(self, component: "Component", **kwargs: Any) -> None:
-        BaseExtensionClass.__init__(self, component)
+        ComponentExtension.ExtensionClass.__init__(self, component)
         View.__init__(self, **kwargs)
 
     # NOTE: The methods below are defined to satisfy the `View` class. All supported methods

src/django_components/urls.py

@@ -1,7 +1,18 @@
 from django.urls import include, path
 
+from django_components.dependencies import urlpatterns as dependencies_urlpatterns
+from django_components.extension import urlpatterns as extension_urlpatterns
+
 urlpatterns = [
-    path("components/", include("django_components.dependencies")),
+    path(
+        "components/",
+        include(
+            [
+                *dependencies_urlpatterns,
+                *extension_urlpatterns,
+            ]
+        ),
+    ),
 ]
 
 __all__ = ["urlpatterns"]

src/django_components/util/command.py

@@ -228,7 +228,7 @@ class ComponentCommand:
     For example, if you define and install the following extension:
 
     ```python
-    from django_components ComponentCommand, ComponentsExtension
+    from django_components ComponentCommand, ComponentExtension
 
     class HelloCommand(ComponentCommand):
         name = "hello"
@@ -236,7 +236,7 @@ class ComponentCommand:
         def handle(self, *args, **kwargs):
             print("Hello, world!")
 
-    class MyExt(ComponentsExtension):
+    class MyExt(ComponentExtension):
         name = "my_ext"
         commands = [HelloCommand]
     ```
@@ -250,7 +250,7 @@ class ComponentCommand:
     You can also define arguments for the command, which will be passed to the command's `handle` method.
 
     ```python
-    from django_components import CommandArg, ComponentCommand, ComponentsExtension
+    from django_components import CommandArg, ComponentCommand, ComponentExtension
 
     class HelloCommand(ComponentCommand):
         name = "hello"

src/django_components/util/routing.py

@@ -0,0 +1,62 @@
+from dataclasses import dataclass, field
+from typing import Any, Dict, List, Optional, Protocol
+
+
+class URLRouteHandler(Protocol):
+    """Framework-agnostic 'view' function for routes"""
+
+    def __call__(self, request: Any, *args: Any, **kwargs: Any) -> Any: ...  # noqa: E704
+
+
+@dataclass
+class URLRoute:
+    """
+    Framework-agnostic route definition.
+
+    This is similar to Django's `URLPattern` object created with
+    [`django.urls.path()`](https://docs.djangoproject.com/en/5.1/ref/urls/#path).
+
+    The `URLRoute` must either define a `handler` function or have a list of child routes `children`.
+    If both are defined, an error will be raised.
+
+    **Example:**
+
+    ```python
+    URLRoute("/my/path", handler=my_handler, name="my_name", extra={"kwargs": {"my_extra": "my_value"}})
+    ```
+
+    Is equivalent to:
+
+    ```python
+    django.urls.path("/my/path", my_handler, name="my_name", kwargs={"my_extra": "my_value"})
+    ```
+
+    With children:
+
+    ```python
+    URLRoute(
+        "/my/path",
+        name="my_name",
+        extra={"kwargs": {"my_extra": "my_value"}},
+        children=[
+            URLRoute(
+                "/child/<str:name>/",
+                handler=my_handler,
+                name="my_name",
+                extra={"kwargs": {"my_extra": "my_value"}},
+            ),
+            URLRoute("/other/<int:id>/", handler=other_handler),
+        ],
+    )
+    ```
+    """
+
+    path: str
+    handler: Optional[URLRouteHandler] = None
+    children: List["URLRoute"] = field(default_factory=list)
+    name: Optional[str] = None
+    extra: Dict[str, Any] = field(default_factory=dict)
+
+    def __post_init__(self) -> None:
+        if self.handler is not None and self.children:
+            raise ValueError("Cannot have both handler and children")

src/django_components/util/testing.py

@@ -438,6 +438,7 @@ def _setup_djc_global_state(
     from django_components.app_settings import app_settings
 
     app_settings._load_settings()
+    extensions._initialized = False
     extensions._init_app()
 
 

tests/test_extension.py

@@ -1,12 +1,15 @@
 import gc
 from typing import Any, Callable, Dict, List, cast
 
+from django.http import HttpRequest, HttpResponse
 from django.template import Context
+from django.test import Client
 
 from django_components import Component, Slot, register, registry
 from django_components.app_settings import app_settings
 from django_components.component_registry import ComponentRegistry
 from django_components.extension import (
+    URLRoute,
     ComponentExtension,
     OnComponentClassCreatedContext,
     OnComponentClassDeletedContext,
@@ -25,6 +28,16 @@ from .testutils import setup_test_config
 setup_test_config({"autodiscover": False})
 
 
+def dummy_view(request: HttpRequest):
+    # Test that the request object is passed to the view
+    assert isinstance(request, HttpRequest)
+    return HttpResponse("Hello, world!")
+
+
+def dummy_view_2(request: HttpRequest, id: int, name: str):
+    return HttpResponse(f"Hello, world! {id} {name}")
+
+
 class DummyExtension(ComponentExtension):
     """
     Test extension that tracks all hook calls and their arguments.
@@ -44,6 +57,11 @@ class DummyExtension(ComponentExtension):
             "on_component_data": [],
         }
 
+    urls = [
+        URLRoute(path="dummy-view/", handler=dummy_view, name="dummy"),
+        URLRoute(path="dummy-view-2/<int:id>/<str:name>/", handler=dummy_view_2, name="dummy-2"),
+    ]
+
     def on_component_class_created(self, ctx: OnComponentClassCreatedContext) -> None:
         # NOTE: Store only component name to avoid strong references
         self.calls["on_component_class_created"].append(ctx.component_cls.__name__)
@@ -73,6 +91,20 @@ class DummyExtension(ComponentExtension):
         self.calls["on_component_data"].append(ctx)
 
 
+class DummyNestedExtension(ComponentExtension):
+    name = "test_nested_extension"
+
+    urls = [
+        URLRoute(
+            path="nested-view/",
+            children=[
+                URLRoute(path="<int:id>/<str:name>/", handler=dummy_view_2, name="dummy-2"),
+            ],
+            name="dummy",
+        ),
+    ]
+
+
 def with_component_cls(on_created: Callable):
     class TestComponent(Component):
         template = "Hello {{ name }}!"
@@ -91,17 +123,16 @@ def with_registry(on_created: Callable):
 
 @djc_test
 class TestExtension:
-    @djc_test(
+    @djc_test(components_settings={"extensions": [DummyExtension]})
-        components_settings={"extensions": [DummyExtension]}
-    )
     def test_extensios_setting(self):
         assert len(app_settings.EXTENSIONS) == 2
         assert isinstance(app_settings.EXTENSIONS[0], ViewExtension)
         assert isinstance(app_settings.EXTENSIONS[1], DummyExtension)
 
-    @djc_test(
+
-        components_settings={"extensions": [DummyExtension]}
+@djc_test
-    )
+class TestExtensionHooks:
+    @djc_test(components_settings={"extensions": [DummyExtension]})
     def test_component_class_lifecycle_hooks(self):
         extension = cast(DummyExtension, app_settings.EXTENSIONS[1])
 
@@ -130,9 +161,7 @@ class TestExtension:
         assert len(extension.calls["on_component_class_deleted"]) == 1
         assert extension.calls["on_component_class_deleted"][0] == "TestComponent"
 
-    @djc_test(
+    @djc_test(components_settings={"extensions": [DummyExtension]})
-        components_settings={"extensions": [DummyExtension]}
-    )
     def test_registry_lifecycle_hooks(self):
         extension = cast(DummyExtension, app_settings.EXTENSIONS[1])
 
@@ -162,9 +191,7 @@ class TestExtension:
         assert len(extension.calls["on_registry_deleted"]) == 1
         assert extension.calls["on_registry_deleted"][0] == reg_id
 
-    @djc_test(
+    @djc_test(components_settings={"extensions": [DummyExtension]})
-        components_settings={"extensions": [DummyExtension]}
-    )
     def test_component_registration_hooks(self):
         class TestComponent(Component):
             template = "Hello {{ name }}!"
@@ -191,9 +218,7 @@ class TestExtension:
         assert unreg_call.name == "test_comp"
         assert unreg_call.component_cls == TestComponent
 
-    @djc_test(
+    @djc_test(components_settings={"extensions": [DummyExtension]})
-        components_settings={"extensions": [DummyExtension]}
-    )
     def test_component_render_hooks(self):
         @register("test_comp")
         class TestComponent(Component):
@@ -211,9 +236,7 @@ class TestExtension:
         # Render the component with some args and kwargs
         test_context = Context({"foo": "bar"})
         test_slots = {"content": "Some content"}
-        TestComponent.render(
+        TestComponent.render(context=test_context, args=("arg1", "arg2"), kwargs={"name": "Test"}, slots=test_slots)
-            context=test_context, args=("arg1", "arg2"), kwargs={"name": "Test"}, slots=test_slots
-        )
 
         extension = cast(DummyExtension, app_settings.EXTENSIONS[1])
 
@@ -236,3 +259,34 @@ class TestExtension:
         assert data_call.context_data == {"name": "Test"}
         assert data_call.js_data == {"script": "console.log('Hello!')"}
         assert data_call.css_data == {"style": "body { color: blue; }"}
+
+
+@djc_test
+class TestExtensionViews:
+    @djc_test(components_settings={"extensions": [DummyExtension]})
+    def test_views(self):
+        client = Client()
+
+        # Check basic view
+        response = client.get("/components/ext/test_extension/dummy-view/")
+        assert response.status_code == 200
+        assert response.content == b"Hello, world!"
+
+        # Check that URL parameters are passed to the view
+        response2 = client.get("/components/ext/test_extension/dummy-view-2/123/John/")
+        assert response2.status_code == 200
+        assert response2.content == b"Hello, world! 123 John"
+
+    @djc_test(components_settings={"extensions": [DummyNestedExtension]})
+    def test_nested_views(self):
+        client = Client()
+
+        # Check basic view
+        # NOTE: Since the parent route contains child routes, the parent route should not be matched
+        response = client.get("/components/ext/test_nested_extension/nested-view/")
+        assert response.status_code == 404
+
+        # Check that URL parameters are passed to the view
+        response2 = client.get("/components/ext/test_nested_extension/nested-view/123/John/")
+        assert response2.status_code == 200
+        assert response2.content == b"Hello, world! 123 John"