Improve assignSelf function

app/Http/Controllers/TasksController.php

@@ -43,21 +43,25 @@ class TasksController extends Controller
         }
     }
 
-    public function assignSelf(Request $request): JsonResponse {
-
+    public function assignSelf(Request $request): JsonResponse
+    {
         try {
+            $task = Task::findOrFail($request["task_id"]);
 
-            $task = Task::find($request["task_id"]);
-
-            if($task->max_participants === $task->users()->count()) {
+            if ($task->users()->count() >= $task->max_participants) {
                 return response()->json(["message" => "Max participants reached"], 403);
             }
 
+            if ($task->users()->where('users.id', $request->user()->id)->exists()) {
+                return response()->json(["message" => "Already registered"], 409);
+            }
+
             $task->users()->attach($request->user()->id);
+
             return response()->json(['message' => "Task assigned"], 200);
 
-        } catch (\Exception $e) {
-            Log::info($e->getMessage());
+        } catch (\Throwable $e) {
+            Log::error($e->getMessage());
             return response()->json(['message' => "Server error"], 500);
         }
     }