refactor: fix ext URLs lookup (#1086)

* refactor: fix ext URLs lookup

CHANGELOG.md

@@ -12,11 +12,15 @@
     # settings.py
     COMPONENTS = {
         "extensions": [
-            "djc_ext_pydantic.PydanticExtension",
+            "djc_pydantic.PydanticExtension",
         ],
     }
     ```
 
+#### Fix
+
+- Make it possible to resolve URLs added by extensions by their names
+
 ## v0.135
 
 #### Feat

docs/concepts/advanced/typing_and_validation.md

@@ -193,7 +193,7 @@ And add the extension to your project:
 ```py
 COMPONENTS = {
     "extensions": [
-        "djc_ext_pydantic.PydanticExtension",
+        "djc_pydantic.PydanticExtension",
     ],
 }
 ```

src/django_components/extension.py

@@ -3,7 +3,7 @@ from typing import TYPE_CHECKING, Any, Callable, Dict, List, NamedTuple, Tuple,
 
 import django.urls
 from django.template import Context
-from django.urls import URLResolver
+from django.urls import URLResolver, get_resolver, get_urlconf
 
 from django_components.app_settings import app_settings
 from django_components.compat.django import routes_to_django
@@ -634,6 +634,11 @@ class ExtensionManager:
         ext_url_resolver.urlconf_name = urls
         ext_url_resolver.url_patterns = urls
 
+        # Rebuild URL resolver cache to be able to resolve the new routes by their names.
+        urlconf = get_urlconf()
+        resolver = get_resolver(urlconf)
+        resolver._populate()
+
     def get_extension(self, name: str) -> ComponentExtension:
         for extension in self.extensions:
             if extension.name == name:

tests/test_finders.py

@@ -75,6 +75,8 @@ COMPONENTS = {
     "dirs": [Path(__file__).resolve().parent / "components"],
 }
 
+urlpatterns: list = []
+
 
 class StaticFilesFinderTests(SimpleTestCase):
     @djc_test(