fix: child workflows that call continueAsNew were not dispatching parent workflow at completion

src/Traits/Continues.php

@@ -16,8 +16,25 @@ public static function continueAsNew(...$arguments): PromiseInterface
         $context = self::$context;
 
         if (! $context->replaying) {
+            $parentWorkflow = $context->storedWorkflow->parents()
+                ->wherePivot('parent_index', '!=', StoredWorkflow::CONTINUE_PARENT_INDEX)
+                ->wherePivot('parent_index', '!=', StoredWorkflow::ACTIVE_WORKFLOW_INDEX)
+                ->withPivot('parent_index')
+                ->first();
+
             $newWorkflow = self::make($context->storedWorkflow->class);
-            $newWorkflow->start(...$arguments);
+
+            if ($parentWorkflow) {
+                $parentWorkflow->children()
+                    ->attach($newWorkflow->storedWorkflow, [
+                        'parent_index' => $parentWorkflow->pivot->parent_index,
+                        'parent_now' => $context->now,
+                    ]);
+
+                $parentWorkflow->children()
+                    ->wherePivot('parent_index', $parentWorkflow->pivot->parent_index)
+                    ->detach($context->storedWorkflow);
+            }
 
             $newWorkflow->storedWorkflow->parents()
                 ->attach($context->storedWorkflow, [
@@ -45,6 +62,8 @@ public static function continueAsNew(...$arguments): PromiseInterface
                         'parent_now' => $context->now,
                     ]);
             }
+
+            $newWorkflow->start(...$arguments);
         }
 
         self::$context = $context;

tests/Feature/ParentContinueAsNewChildWorkflowTest.php

@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Feature;
+
+use Tests\Fixtures\TestParentContinueAsNewChildWorkflow;
+use Tests\TestCase;
+use Workflow\States\WorkflowCompletedStatus;
+use Workflow\WorkflowStub;
+
+final class ParentContinueAsNewChildWorkflowTest extends TestCase
+{
+    public function testChildWorkflowContinuesAsNew(): void
+    {
+        $workflow = WorkflowStub::make(TestParentContinueAsNewChildWorkflow::class);
+
+        $workflow->start();
+
+        while ($workflow->running());
+
+        $this->assertEquals(WorkflowCompletedStatus::class, $workflow->status());
+        $this->assertEquals('parent_child_done', $workflow->output());
+    }
+}

tests/Fixtures/TestChildContinueAsNewWorkflow.php

@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Fixtures;
+
+use Workflow\Workflow;
+use Workflow\WorkflowStub;
+
+class TestChildContinueAsNewWorkflow extends Workflow
+{
+    public function execute(int $count = 0, int $totalCount = 2)
+    {
+        if ($count >= $totalCount) {
+            return 'child_done';
+        }
+        return yield WorkflowStub::continueAsNew($count + 1, $totalCount);
+    }
+}

tests/Fixtures/TestParentContinueAsNewChildWorkflow.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Fixtures;
+
+use Workflow\ChildWorkflowStub;
+use Workflow\Workflow;
+
+class TestParentContinueAsNewChildWorkflow extends Workflow
+{
+    public function execute()
+    {
+        $childResult = yield ChildWorkflowStub::make(TestChildContinueAsNewWorkflow::class);
+        return 'parent_' . $childResult;
+    }
+}