From 1b71ae46fe01c4fe0128be5cf67f4fc3e458acc8 Mon Sep 17 00:00:00 2001
From: Pavel Borunov <8665691+mrneatly@users.noreply.github.com>
Date: Sat, 28 May 2022 11:29:28 +0300
Subject: [PATCH 1/2] Allow to sync a single model instance

Fix `sync()` method not handling properly single model's instances passed via `$ids` argument
---
 src/Relations/BelongsToMany.php | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Relations/BelongsToMany.php b/src/Relations/BelongsToMany.php
index 2352adc50..ef2f3a1c5 100644
--- a/src/Relations/BelongsToMany.php
+++ b/src/Relations/BelongsToMany.php
@@ -8,6 +8,7 @@
 use Illuminate\Database\Eloquent\Model as EloquentModel;
 use Illuminate\Database\Eloquent\Relations\BelongsToMany as EloquentBelongsToMany;
 use Illuminate\Support\Arr;
+use Jenssegers\Mongodb\Eloquent\Model as MongodbModel;
 
 class BelongsToMany extends EloquentBelongsToMany
 {
@@ -122,7 +123,9 @@ public function sync($ids, $detaching = true)
 
         if ($ids instanceof Collection) {
             $ids = $ids->modelKeys();
-        }
+        } else if ($ids instanceof MongodbModel) {
+			$ids = [$ids->{$this->relatedKey}];
+		}
 
         // First we need to attach any of the associated models that are not currently
         // in this joining table. We'll spin through the given IDs, checking to see

From c5cdadbd51ea37781722ed8a746d5932805ff14e Mon Sep 17 00:00:00 2001
From: Pavel Borunov <8665691+mrneatly@users.noreply.github.com>
Date: Sat, 28 May 2022 11:54:00 +0300
Subject: [PATCH 2/2] Fix code style

---
 src/Relations/BelongsToMany.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Relations/BelongsToMany.php b/src/Relations/BelongsToMany.php
index ef2f3a1c5..656043eaf 100644
--- a/src/Relations/BelongsToMany.php
+++ b/src/Relations/BelongsToMany.php
@@ -123,7 +123,7 @@ public function sync($ids, $detaching = true)
 
         if ($ids instanceof Collection) {
             $ids = $ids->modelKeys();
-        } else if ($ids instanceof MongodbModel) {
+        } elseif ($ids instanceof MongodbModel) {
 			$ids = [$ids->{$this->relatedKey}];
 		}