Update requests fail with "could not be converted to string" error

[commadelimited]

Q	A
Bug?	no
New Feature?	no
Framework	Lumen
Framework version	8.0
Package version	12.0
PHP version	7.4

Actual Behavior

I'm pretty sure this is just a configuration issue, but don't see what I'm missing, so I'm hoping the community can help me identify the error in my setup.

1. I'm using Laravel auth to pass User into the application which uses Laravel Auditing. Calling $request->user() returns a full user object with roles, scopes, name, etc.
2. It also contains a uuid field as a top level property which is what I'd like to use for the user_id field when storing records in the audits table.
3. The overarching application I work in uses micro services and the particular section I'm responsible for does not have a User model, nor do any of the models contain a user uuid foreign key.
4. When I edit a record I'm getting the following stack trace.

[2021-09-29 16:28:25] local.ERROR: Object of class REDACTED\Api\Http\Client\Resources\Json\NestedFluent could not be converted to string {"exception":"[object] (Error(code: 0): Object of class REDACTED\\Api\\Http\\Client\\Resources\\Json\\NestedFluent could not be converted to string at /code/ads/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:66)
[stacktrace]
#0 /code/ads/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php(66): PDOStatement->bindValue(7, Object(REDACTED\\Api\\Http\\Client\\Resources\\Json\\NestedFluent), 2)
#1 /code/ads/vendor/illuminate/database/Connection.php(610): Doctrine\\DBAL\\Driver\\PDOStatement->bindValue(7, Object(REDACTED\\Api\\Http\\Client\\Resources\\Json\\NestedFluent), 2)
#2 /code/ads/vendor/illuminate/database/Connection.php(488): Illuminate\\Database\\Connection->bindValues(Object(Doctrine\\DBAL\\Driver\\PDO\\Statement), Array)
#3 /code/ads/vendor/illuminate/database/Connection.php(696): Illuminate\\Database\\Connection->Illuminate\\Database\\{closure}('insert into `au...', Array)
#4 /code/ads/vendor/illuminate/database/Connection.php(663): Illuminate\\Database\\Connection->runQueryCallback('insert into `au...', Array, Object(Closure))
#5 /code/ads/vendor/illuminate/database/Connection.php(493): Illuminate\\Database\\Connection->run('insert into `au...', Array, Object(Closure))
#6 /code/ads/vendor/illuminate/database/Connection.php(445): Illuminate\\Database\\Connection->statement('insert into `au...', Array)
#7 /code/ads/vendor/illuminate/database/Query/Processors/Processor.php(32): Illuminate\\Database\\Connection->insert('insert into `au...', Array)
#8 /code/ads/vendor/illuminate/database/Query/Builder.php(3022): Illuminate\\Database\\Query\\Processors\\Processor->processInsertGetId(Object(Illuminate\\Database\\Query\\Builder), 'insert into `au...', Array, 'id')
#9 /code/ads/vendor/illuminate/database/Eloquent/Builder.php(1641): Illuminate\\Database\\Query\\Builder->insertGetId(Array, 'id')
#10 /code/ads/vendor/illuminate/database/Eloquent/Model.php(1180): Illuminate\\Database\\Eloquent\\Builder->__call('insertGetId', Array)
#11 /code/ads/vendor/illuminate/database/Eloquent/Model.php(1145): Illuminate\\Database\\Eloquent\\Model->insertAndSetId(Object(Illuminate\\Database\\Eloquent\\Builder), Array)
#12 /code/ads/vendor/illuminate/database/Eloquent/Model.php(986): Illuminate\\Database\\Eloquent\\Model->performInsert(Object(Illuminate\\Database\\Eloquent\\Builder))
#13 /code/ads/vendor/illuminate/database/Eloquent/Builder.php(884): Illuminate\\Database\\Eloquent\\Model->save()
#14 /code/ads/vendor/illuminate/support/helpers.php(263): Illuminate\\Database\\Eloquent\\Builder->Illuminate\\Database\\Eloquent\\{closure}(Object(OwenIt\\Auditing\\Models\\Audit))
#15 /code/ads/vendor/illuminate/database/Eloquent/Builder.php(885): tap(Object(OwenIt\\Auditing\\Models\\Audit), Object(Closure))
#16 /code/ads/vendor/illuminate/support/Traits/ForwardsCalls.php(23): Illuminate\\Database\\Eloquent\\Builder->create(Array)
#17 /code/ads/vendor/illuminate/database/Eloquent/Model.php(2109): Illuminate\\Database\\Eloquent\\Model->forwardCallTo(Object(Illuminate\\Database\\Eloquent\\Builder), 'create', Array)
#18 /code/ads/vendor/illuminate/database/Eloquent/Model.php(2121): Illuminate\\Database\\Eloquent\\Model->__call('create', Array)
#19 [internal function]: Illuminate\\Database\\Eloquent\\Model::__callStatic('create', Array)
#20 /code/ads/vendor/owen-it/laravel-auditing/src/Drivers/Database.php(19): call_user_func(Array, Array)
#21 /code/ads/vendor/owen-it/laravel-auditing/src/Auditor.php(69): OwenIt\\Auditing\\Drivers\\Database->audit(Object(App\\Models\\Creative))
#22 /code/ads/vendor/illuminate/support/Facades/Facade.php(261): OwenIt\\Auditing\\Auditor->execute(Object(App\\Models\\Creative))
#23 /code/ads/vendor/owen-it/laravel-auditing/src/AuditableObserver.php(52): Illuminate\\Support\\Facades\\Facade::__callStatic('execute', Array)
#24 /code/ads/vendor/illuminate/events/Dispatcher.php(424): OwenIt\\Auditing\\AuditableObserver->updated(Object(App\\Models\\Creative))
#25 /code/ads/vendor/illuminate/events/Dispatcher.php(249): Illuminate\\Events\\Dispatcher->Illuminate\\Events\\{closure}('eloquent.update...', Array)
#26 /code/ads/vendor/illuminate/database/Eloquent/Concerns/HasEvents.php(189): Illuminate\\Events\\Dispatcher->dispatch('eloquent.update...', Array)
#27 /code/ads/vendor/illuminate/database/Eloquent/Model.php(1068): Illuminate\\Database\\Eloquent\\Model->fireModelEvent('updated', false)
#28 /code/ads/vendor/illuminate/database/Eloquent/Model.php(979): Illuminate\\Database\\Eloquent\\Model->performUpdate(Object(Illuminate\\Database\\Eloquent\\Builder))
#29 /code/ads/vendor/illuminate/database/Eloquent/Model.php(877): Illuminate\\Database\\Eloquent\\Model->save(Array)
#30 /code/ads/app/Http/Controllers/Creatives/CreativeController.php(76): Illuminate\\Database\\Eloquent\\Model->update(Array)
#31 /code/ads/vendor/illuminate/container/BoundMethod.php(36): App\\Http\\Controllers\\Creatives\\CreativeController->update(Object(App\\Http\\Requests\\UpdateCreativeRequest), '00ecd86e-62a9-3...')
#32 /code/ads/vendor/illuminate/container/Util.php(40): Illuminate\\Container\\BoundMethod::Illuminate\\Container\\{closure}()
#33 /code/ads/vendor/illuminate/container/BoundMethod.php(93): Illuminate\\Container\\Util::unwrapIfClosure(Object(Closure))
#34 /code/ads/vendor/illuminate/container/BoundMethod.php(37): Illuminate\\Container\\BoundMethod::callBoundMethod(Object(REDACTED\\Api\\Application\\TaApplication), Array, Object(Closure))
#35 /code/ads/vendor/illuminate/container/Container.php(653): Illuminate\\Container\\BoundMethod::call(Object(REDACTED\\Api\\Application\\TaApplication), Array, Array, NULL)
#36 /code/ads/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(389): Illuminate\\Container\\Container->call(Array, Array)
#37 /code/ads/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(355): Laravel\\Lumen\\Application->callControllerCallable(Array, Array)
#38 /code/ads/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(329): Laravel\\Lumen\\Application->callLumenController(Object(App\\Http\\Controllers\\Creatives\\CreativeController), 'update', Array)
#39 /code/ads/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(282): Laravel\\Lumen\\Application->callControllerAction(Array)
#40 /code/ads/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(262): Laravel\\Lumen\\Application->callActionOnArrayBasedRoute(Array)
#41 /code/ads/vendor/laravel/lumen-framework/src/Routing/Pipeline.php(48): Laravel\\Lumen\\Application->Laravel\\Lumen\\Concerns\\{closure}(Object(Laravel\\Lumen\\Http\\Request))
#42 /code/lumen-api/src/Http/Middleware/RequiresApiKey.php(32): Laravel\\Lumen\\Routing\\Pipeline->Laravel\\Lumen\\Routing\\{closure}(Object(Laravel\\Lumen\\Http\\Request))
#43 /code/ads/vendor/illuminate/pipeline/Pipeline.php(167): REDACTED\\Api\\Http\\Middleware\\RequiresApiKey->handle(Object(Laravel\\Lumen\\Http\\Request), Object(Closure))
#44 /code/ads/vendor/laravel/lumen-framework/src/Routing/Pipeline.php(30): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Laravel\\Lumen\\Http\\Request))
#45 /code/ads/vendor/illuminate/pipeline/Pipeline.php(103): Laravel\\Lumen\\Routing\\Pipeline->Laravel\\Lumen\\Routing\\{closure}(Object(Laravel\\Lumen\\Http\\Request))
#46 /code/ads/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(426): Illuminate\\Pipeline\\Pipeline->then(Object(Closure))
#47 /code/ads/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(263): Laravel\\Lumen\\Application->sendThroughPipeline(Array, Object(Closure))
#48 /code/ads/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(237): Laravel\\Lumen\\Application->handleFoundRoute(Array)
#49 /code/ads/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(173): Laravel\\Lumen\\Application->handleDispatcherResponse(Array)
#50 /code/ads/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(429): Laravel\\Lumen\\Application->Laravel\\Lumen\\Concerns\\{closure}(Object(Laravel\\Lumen\\Http\\Request))
#51 /code/ads/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(175): Laravel\\Lumen\\Application->sendThroughPipeline(Array, Object(Closure))
#52 /code/ads/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(112): Laravel\\Lumen\\Application->dispatch(NULL)
#53 /code/ads/public/index.php(28): Laravel\\Lumen\\Application->run()
#54 {main}
"}

And the actual SQL / values that are trying to be inserted into the database (around stack trace entry #9)

insert into `audits` (
    `old_values`,
    `new_values`,
    `event`,
    `auditable_id`,
    `auditable_type`,
    `user_id`,
    `user_type`,
    `url`,
    `ip_address`,
    `user_agent`,
    `tags`,
    `updated_at`,
    `created_at`
) values (?,
    ?,
    ?,
    ?,
    ?,
    ?,
    ?,
    ?,
    ?,
    ?,
    ?,
    ?,
    ?
)
[
    "{\"name\":\"222 Bechtelar Ltd LLC\",\"description\":\"222 Voluptatem rerum doloremque est\"}",
    "{\"name\":\"33 Bechtelar Ltd LLC\",\"description\":\"333 Voluptatem rerum doloremque \"}",
    "updated",
    3,
    "App\\Models\\Creative",
    "00000000-0000-0000-0000-000000000010",
    {
        "REDACTED\\Api\\Http\\Client\\Resources\\Json\\NestedFluent": {
            "uuid":"00000000-0000-0000-0000-000000000010",
            "first_name":"Andy",
            "last_name":"Matthews",
            "display_name":"Andy Matthews",
            "status":"active",
            "email":"[email protected]",
            "job_title":null,
            "phone":"3567123",
            "preferred_name":null,
            "roles":[
                {"name":"Admin","code":"admin"},
                {"name":"Engineer","code":"software_engineer"}
            ],
            "scopes":[
                "impersonate-user",
                "impersonate-all-users",
                "support_access",
                "access-components",
                "manage-users",
            ],
            "features":[
                "call-mocking",
                "qa-question-dq",
                "kenny-tracker"
            ],
            "avatar_url":"REDACTED",
            "force_password_change":0,
            "account":"REDACTED",
            "account_uuid":"00000000-0000-0000-0000-000000000000",
            "client_uuid":null,
            "getMorphClass":true
        }
    },
    "REDACTED",
    "10.42.0.66",
    "GuzzleHttp/6.5.5 curl/7.78.0 PHP/8.0.10",
    null,
    "2021-09-29 16:44:11","2021-09-29 16:44:11"
]

Here's my migration

    Schema::create('audits', function (Blueprint $table) {
        $table->bigIncrements('id');
        $table->string('user_type')->nullable();
        $table->uuid('user_id')->nullable();
        $table->string('event');

        $table->uuid('auditable_id');
        $table->string('auditable_type');
        $table->index([
            'auditable_id',
            'auditable_type',
        ]);

        $table->text('old_values')->nullable();
        $table->text('new_values')->nullable();
        $table->text('url')->nullable();
        $table->ipAddress('ip_address')->nullable();
        $table->string('user_agent', 1023)->nullable();
        $table->string('tags')->nullable();
        $table->timestamps();

        $table->index(['user_id', 'user_type']);
    });

Here's my config/audits.php file

<?php

return [
    'enabled' => env('AUDITING_ENABLED', true),
    'implementation' => OwenIt\Auditing\Models\Audit::class,
    'user' => [
        'morph_prefix' => 'user',
        'guards'       => [
            'api',
        ],
    ],
    'resolver' => [
        'user'       => OwenIt\Auditing\Resolvers\UserResolver::class,
        'ip_address' => OwenIt\Auditing\Resolvers\IpAddressResolver::class,
        'user_agent' => OwenIt\Auditing\Resolvers\UserAgentResolver::class,
        'url'        => OwenIt\Auditing\Resolvers\UrlResolver::class,
    ],
    'events' => [
        'created',
        'updated',
        'deleted',
        'restored',
    ],
    'strict' => false,
    'timestamps' => false,
    'threshold' => 0,
    'driver' => 'database',
    'drivers' => [
        'database' => [
            'table'      => 'audits',
            'connection' => null,
        ],
    ],
    'console' => false,
];

Expected Behavior

I'm not sure what the SQL is supposed to look like but I'm guessing I'm simply giving it the wrong inputs in the config. Could someone please help me make the necessary change?