add type column

database/migrations/create_workflows_table.php.stub

@@ -11,6 +11,9 @@ return new class extends Migration
         Schema::create('workflows', function (Blueprint $table) {
             $table->id();
 
+            // definition class
+            $table->string('type')->index();
+
             // serialized class
             $table->longText('definition');
 

src/Concerns/HasWorkflows.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Elegantly\Workflow\Concerns;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\MorphMany;
+
+trait HasWorkflows
+{
+    /**
+     * @return MorphMany<Workflow, Model>
+     */
+    public function workflows(): MorphMany
+    {
+        return $this->morphMany(Workflow::class, 'model');
+    }
+}

src/Models/Workflow.php

@@ -15,6 +15,7 @@
 
 /**
  * @property int $id
+ * @property string $type Definition class
  * @property ?string $step
  * @property WorkflowDefinition $definition Serialized Workflow definition
  * @property Collection<int, WorkflowItem> $items
@@ -69,12 +70,12 @@ public function model(): MorphTo
     }
 
     /**
-     * @return Attribute<WorkflowDefinition, WorkflowDefinition|string>
+     * @return Attribute<WorkflowDefinition, WorkflowDefinition>
      */
     protected function definition(): Attribute
     {
         return Attribute::make(
-            get: function ($value) {
+            get: function (mixed $value) {
                 if (is_string($value)) {
                     return unserialize($value);
                 }
@@ -84,15 +85,11 @@ protected function definition(): Attribute
 
                 return null;
             },
-            set: function ($value) {
-                if (is_string($value)) {
-                    return $value;
-                }
-                if ($value instanceof WorkflowDefinition) {
-                    return serialize($value);
-                }
-
-                return null;
+            set: function (WorkflowDefinition $value) {
+                return [
+                    'definition' => serialize($value),
+                    'type' => $value::class,
+                ];
             },
         );
     }

tests/Feature/WorkflowDefinitionTest.php

@@ -9,6 +9,8 @@
 
     $workflow = $definition->start();
 
+    expect($workflow->type)->toBe(TestWorkflowDefinition::class);
+    expect($workflow->definition)->toBeInstanceOf(TestWorkflowDefinition::class);
     expect($workflow->exists)->toBe(true);
     expect($workflow->items)->toHaveLength(2);