Pass connection instance to transactional closure

This is consistent with the behaviour of the original ManagesTransactions concern.

Author: alcaeus

src/Concerns/ManagesTransactions.php

@@ -84,8 +84,6 @@ public function transaction(Closure $callback, $attempts = 1, array $options = [
         $attemptsLeft = $attempts;
         $callbackResult = null;
 
-        $session = $this->getSessionOrCreate();
-
         $callbackFunction = function (Session $session) use ($callback, &$attemptsLeft, &$callbackResult) {
             $attemptsLeft--;
 
@@ -95,10 +93,10 @@ public function transaction(Closure $callback, $attempts = 1, array $options = [
                 return;
             }
 
-            $callbackResult = $callback();
+            $callbackResult = $callback($this);
         };
 
-        with_transaction($session, $callbackFunction, $options);
+        with_transaction($this->getSessionOrCreate(), $callbackFunction, $options);
 
         return $callbackResult;
     }

tests/TransactionTest.php

@@ -1,6 +1,7 @@
 <?php
 
 use Illuminate\Support\Facades\DB;
+use Jenssegers\Mongodb\Connection;
 use Jenssegers\Mongodb\Eloquent\Model;
 use MongoDB\BSON\ObjectId;
 use MongoDB\Driver\Server;
@@ -316,7 +317,7 @@ public function testTransaction(): void
     {
         User::create(['name' => 'klinson', 'age' => 20, 'title' => 'admin']);
 
-        DB::transaction(function (): void {
+        DB::transaction(function (Connection $connection): void {
             User::create(['name' => 'alcaeus', 'age' => 38, 'title' => 'admin']);
             User::where(['name' => 'klinson'])->update(['age' => 21]);
         });