fix: event-log route handles missing location_id

The /event-log route now shows a location selector dropdown instead of
returning a 422 error when no location_id is provided. This follows the
same pattern used by the Eggs page.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/animaltrack/web/routes/events.py

@@ -11,6 +11,7 @@ from starlette.requests import Request
 from starlette.responses import HTMLResponse
 
 from animaltrack.repositories.locations import LocationRepository
+from animaltrack.repositories.user_defaults import UserDefaultsRepository
 from animaltrack.web.templates import page
 from animaltrack.web.templates.events import event_log_list, event_log_panel
 
@@ -56,25 +57,36 @@ def event_log_index(request: Request):
     """GET /event-log - Event log for a location."""
     db = request.app.state.db
 
+    # Get auth info
+    auth = request.scope.get("auth")
+    username = auth.username if auth else None
+    user_role = auth.role if auth else None
+
     # Get location_id from query params
     location_id = request.query_params.get("location_id")
-    if not location_id:
-        return HTMLResponse(
-            content="<p>Missing location_id parameter</p>",
-            status_code=422,
-        )
 
-    # Get location name
+    # If no query param, try user defaults
+    if not location_id and username:
+        defaults = UserDefaultsRepository(db).get(username, "event_log")
+        if defaults:
+            location_id = defaults.location_id
+
+    # Get all locations for selector
     location_repo = LocationRepository(db)
     locations = location_repo.list_active()
-    location_name = "Unknown"
-    for loc in locations:
-        if loc.id == location_id:
-            location_name = loc.name
-            break
 
-    # Get event log
-    events = get_event_log(db, location_id)
+    # Find location name if we have a location_id
+    location_name = None
+    if location_id:
+        for loc in locations:
+            if loc.id == location_id:
+                location_name = loc.name
+                break
+
+    # Get event log if we have a valid location
+    events = []
+    if location_id and location_name:
+        events = get_event_log(db, location_id)
 
     # Check if HTMX request
     is_htmx = request.headers.get("HX-Request") == "true"
@@ -85,9 +97,11 @@ def event_log_index(request: Request):
 
     # Full page render
     return page(
-        event_log_panel(events, location_name),
-        title=f"Event Log - {location_name}",
-        active_nav=None,
+        event_log_panel(events, locations, location_id),
+        title="Event Log - AnimalTrack",
+        active_nav="event_log",
+        user_role=user_role,
+        username=username,
     )
 
 

src/animaltrack/web/templates/events.py

@@ -4,7 +4,7 @@
 from datetime import UTC, datetime
 from typing import Any
 
-from fasthtml.common import H3, Div, Li, P, Span, Ul
+from fasthtml.common import H3, Div, Label, Li, Option, P, Select, Span, Ul
 
 
 def format_timestamp(ts_utc: int) -> str:
@@ -120,11 +120,55 @@ def event_log_list(events: list[dict[str, Any]]) -> Any:
     return Ul(*items, cls="divide-y divide-stone-200")
 
 
-def event_log_panel(events: list[dict[str, Any]], location_name: str) -> Any:
-    """Render the full event log panel."""
+def location_selector(locations: list[Any], selected_location_id: str | None) -> Any:
+    """Render location selector dropdown."""
+    options = [Option("Select a location...", value="", selected=not selected_location_id)]
+    for loc in locations:
+        options.append(Option(loc.name, value=loc.id, selected=loc.id == selected_location_id))
+
     return Div(
-        H3(f"Event Log - {location_name}", cls="text-lg font-semibold mb-4"),
-        event_log_list(events),
+        Label("Location", cls="text-sm font-medium text-stone-700"),
+        Select(
+            *options,
+            name="location_id",
+            cls="mt-1 block w-full rounded-md border-stone-300 shadow-sm "
+            "focus:border-amber-500 focus:ring-amber-500 sm:text-sm",
+            hx_get="/event-log",
+            hx_trigger="change",
+            hx_target="#event-log-content",
+            hx_swap="innerHTML",
+            hx_include="this",
+        ),
+        cls="mb-4 max-w-xs",
+    )
+
+
+def event_log_panel(
+    events: list[dict[str, Any]], locations: list[Any], selected_location_id: str | None
+) -> Any:
+    """Render the full event log panel."""
+    # Find location name for header
+    location_name = None
+    if selected_location_id:
+        for loc in locations:
+            if loc.id == selected_location_id:
+                location_name = loc.name
+                break
+
+    header_text = f"Event Log - {location_name}" if location_name else "Event Log"
+
+    return Div(
+        H3(header_text, cls="text-lg font-semibold mb-4"),
+        location_selector(locations, selected_location_id),
+        Div(
+            event_log_list(events)
+            if selected_location_id
+            else P(
+                "Select a location to view events.",
+                cls="text-stone-500 text-sm text-center py-4",
+            ),
+            id="event-log-content",
+        ),
         cls="bg-white rounded-lg shadow p-4",
         id="event-log",
     )

tests/test_web_events.py

@@ -107,10 +107,12 @@ def create_cohort(animal_service, location_id, count=3):
 class TestEventLogRoute:
     """Tests for GET /event-log route."""
 
-    def test_event_log_requires_location_id(self, client):
-        """Event log requires location_id parameter."""
+    def test_event_log_without_location_shows_selector(self, client):
+        """Event log without location_id shows location selector."""
         response = client.get("/event-log")
-        assert response.status_code == 422
+        assert response.status_code == 200
+        # Should show location selector prompt
+        assert "Select a location" in response.text
 
     def test_event_log_returns_empty_for_new_location(self, client, valid_location_id):
         """Event log returns empty state for location with no events."""