Fix: CardDAV sync broke when todo items didn't have a creation date. Also fixed todos without a due date not being displays and wrong calculation of warning badge states.

app/Console/Commands/CaldavSyncCommand.php

@@ -16,7 +16,8 @@ class CaldavSyncCommand extends Command
 
     public function handle(CaldavService $service)
     {
-        // only run every 5 minutes although the task is called every minute
+        // Throttle execution
+        // only run every 5 minutes although the scheduler is run every minute
         $cacheKey = 'caldav_sync_last_run';
         if (\Illuminate\Support\Facades\Cache::has($cacheKey)) {
             Log::info('CalDAV sync Throttled');
@@ -29,6 +30,7 @@ public function handle(CaldavService $service)
 
         $todos = $service->getTodos();
 
+        // Update
         $count = 0;
         foreach ($todos as $todo) {
             // Only update the fields that are present in CalDAV
@@ -74,12 +76,27 @@ public function handle(CaldavService $service)
                 }
             }
 
-            Todo::upsert($data, 'id');
+            // Get the existing todo from the database
+            $existingTodo = Todo::find($data['id']);
+
+            if ($existingTodo) {
+                // Compare the etag or modification date to determine if the todo needs to be updated
+                if ($existingTodo->etag !== $data['etag'] || $existingTodo->last_modified < $data['last_modified']) {
+                    // Update the existing todo with the new data
+                    $existingTodo->update($data);
+                }
+            } else {
+                // Create a new todo if it doesn't exist
+                Todo::create($data);
+            }
+
             $count++;
         }
 
-        // Collect hrefs/URLs returned by the CalDAV server so we can remove local
-        // todos that belong to this calendar but were deleted on the server.
+
+        // Collect hrefs/URLs returned by the CalDAV server so we can compare 
+        // them to local todos and find those that belong to this calendar but 
+        // were deleted on the server.
         $hrefs = array_values(array_filter(array_map(function ($t) {
             return $t->url ?? null;
         }, $todos)));
@@ -98,12 +115,14 @@ public function handle(CaldavService $service)
                 ->delete();
         }
 
+
         // Remove old todos
         Todo::where('status', 'COMPLETED')
             ->where('last_modified', '<', now()->subDays(30)) // TODO: get from settings
             ->where('due_date', '<', now()->subDays(30))
             ->delete();
 
+
         Log::info("Synced " . count($todos) . " todos.");
         $this->info("Synced " . count($todos) . " todos.");