Fix for issue #486 -

composer.json

@@ -47,7 +47,8 @@
     "require-dev": {
         "phpunit/phpunit": "^7.5",
         "mockery/mockery": "^1.0",
-        "orchestra/testbench": "^3.8"
+        "orchestra/testbench": "^3.8",
+        "ramsey/uuid": "^3.0"
     },
     "autoload": {
         "psr-4": {

src/Models/Audit.php

@@ -19,6 +19,6 @@ class Audit extends Model implements \OwenIt\Auditing\Contracts\Audit
     protected $casts = [
         'old_values'   => 'json',
         'new_values'   => 'json',
-        'auditable_id' => 'integer',
+        // Note: Please do not add 'auditable_id' in here, as it will break non-integer PK models
     ];
 }

tests/Models/ApiModel.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace OwenIt\Auditing\Tests\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+use OwenIt\Auditing\Contracts\Auditable;
+
+class ApiModel extends Model implements Auditable
+{
+    use \OwenIt\Auditing\Auditable;
+    use SoftDeletes;
+
+    /**
+     * @var string UUID key
+     */
+    public $primaryKey = 'api_model_id';
+
+    /**
+     * @var bool Set to false for UUID keys
+     */
+    public $incrementing = false;
+
+    /**
+     * @var string Set to string for UUID keys
+     */
+    protected $keyType = 'string';
+
+    /**
+     * {@inheritdoc}
+     */
+    protected $dates = [
+        'published_at',
+    ];
+
+    /**
+     * {@inheritdoc}
+     */
+    protected $fillable = [
+        'api_model_id',
+        'content',
+        'published_at',
+    ];
+}

tests/Unit/AuditableTest.php

@@ -13,6 +13,7 @@
 use OwenIt\Auditing\Models\Audit;
 use OwenIt\Auditing\Redactors\LeftRedactor;
 use OwenIt\Auditing\Redactors\RightRedactor;
+use OwenIt\Auditing\Tests\Models\ApiModel;
 use OwenIt\Auditing\Tests\Models\Article;
 use OwenIt\Auditing\Tests\Models\User;
 use ReflectionClass;
@@ -978,9 +979,16 @@ public function itTransitionsWhenTheAuditAuditableIdTypeDoesNotMatchTheModelIdTy
     {
         $model = factory(Article::class)->create();
 
+        // Key depends on type
+        if ($model->getKeyType() == 'string') {
+            $key = (string) $model->id;
+        } else {
+            $key = (int) $model->id;
+        }
+
         $audit = factory(Audit::class)->create([
             'auditable_type' => Article::class,
-            'auditable_id'   => (string) $model->id,
+            'auditable_id'   => $key,
         ]);
 
         $this->assertInstanceOf(Auditable::class, $model->transitionTo($audit));
@@ -1093,6 +1101,24 @@ public function itTransitionsToAnotherModelState(
         $this->assertSame($newExpectation, $models[1]->getDirty());
     }
 
+    /**
+     * @test
+     */
+    public function itWorksWithStringKeyModels()
+    {
+        $model = factory(ApiModel::class)->create();
+        $model->save();
+        $model->refresh();
+
+        $this->assertCount(1, $model->audits);
+
+        $model->content = 'Something else';
+        $model->save();
+        $model->refresh();
+
+        $this->assertCount(2, $model->audits);
+    }
+
     /**
      * @return array
      */

tests/database/factories/ApiModelFactory.php

@@ -0,0 +1,20 @@
+<?php
+
+use Faker\Generator as Faker;
+use OwenIt\Auditing\Tests\Models\ApiModel;
+use Ramsey\Uuid\Uuid;
+
+/*
+|--------------------------------------------------------------------------
+| APIModel Factories
+|--------------------------------------------------------------------------
+|
+*/
+
+$factory->define(ApiModel::class, function (Faker $faker) {
+    return [
+        'api_model_id' => Uuid::uuid4(),
+        'content'      => $faker->unique()->paragraph(6),
+        'published_at' => null,
+    ];
+});

tests/database/migrations/0000_00_00_000003_create_api_models_test_table.php

@@ -0,0 +1,34 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateApiModelsTestTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('api_models', function (Blueprint $table) {
+            $table->uuid('api_model_id');
+            $table->text('content');
+            $table->timestamp('published_at')->nullable();
+            $table->timestamps();
+            $table->softDeletes();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::drop('api_models');
+    }
+}