add extra_context to NavGroup and NavItem

src/django_simple_nav/nav.py

@@ -2,6 +2,7 @@
 
 from dataclasses import dataclass
 from dataclasses import field
+from typing import Any
 
 from django.http import HttpRequest
 from django.template.loader import render_to_string
@@ -38,20 +39,29 @@ class NavGroup:
     items: list[NavGroup | NavItem]
     url: str | None = None
     permissions: list[str] = field(default_factory=list)
+    extra_context: dict[str, Any] = field(default_factory=dict)
 
 
 @dataclass(frozen=True)
 class NavItem:
     title: str
     url: str
     permissions: list[str] = field(default_factory=list)
+    extra_context: dict[str, Any] = field(default_factory=dict)
 
 
 @dataclass(frozen=True)
 class RenderedNavItem:
     item: NavItem | NavGroup
     request: HttpRequest
 
+    def __getattr__(self, name: str) -> Any:
+        try:
+            return self.item.extra_context[name]
+        except KeyError as err:
+            msg = f"{self.item!r} object has no attribute {name!r}"
+            raise AttributeError(msg) from err
+
     @property
     def title(self) -> str:
         return mark_safe(self.item.title)

tests/test_nav.py

@@ -6,6 +6,8 @@
 from django.utils.module_loading import import_string
 from model_bakery import baker
 
+from django_simple_nav.nav import NavItem
+from django_simple_nav.nav import RenderedNavItem
 from tests.navs import DummyNav
 from tests.utils import count_anchors
 
@@ -96,3 +98,37 @@ def test_nav_render_from_request_with_template_name(req):
     rendered_template = DummyNav.render_from_request(req, "tests/alternate.html")
 
     assert "This is an alternate template." in rendered_template
+
+
+def test_extra_context(req):
+    item = NavItem(
+        title="Test",
+        url="/test/",
+        extra_context={"foo": "bar"},
+    )
+
+    rendered_item = RenderedNavItem(item, req)
+
+    assert rendered_item.foo == "bar"
+
+
+def test_extra_context_with_no_extra_context(req):
+    item = NavItem(
+        title="Test",
+        url="/test/",
+    )
+    rendered_item = RenderedNavItem(item, req)
+
+    with pytest.raises(AttributeError):
+        assert rendered_item.foo == "bar"
+
+
+def test_extra_context_shadowing(req):
+    item = NavItem(
+        title="Test",
+        url="/test/",
+        extra_context={"title": "Shadowed"},
+    )
+    rendered_item = RenderedNavItem(item, req)
+
+    assert rendered_item.title == "Test"