Memory leak when calling toArray() on a saved Mappable model

[jsdtaylor]

Laravel v5.5.34
Eloquence v5.5.1

When writing some API tests for a mapped model, I decided to:

• use a factory to save a model
• GET the resource using its ID
• compare the model's mapped attributes with the json response

When calling $model->toArray() I get OOM errors every time:

$transaction = factory(Transaction::class)->create([
    'user_id' => $I->user->id,
]);
$I->sendGET('api/v1/transactions/'.$transaction->id);
$I->seeResponseCodeIs(HttpCode::OK);
$I->seeResponseContainsJson($transaction->toArray());

PHP Fatal error:  Allowed memory size of 2097152000 bytes exhausted (tried to allocate 20480 bytes) in /
var/www/html/vendor/sofa/hookable/src/Hookable.php on line 261
PHP Fatal error:  Allowed memory size of 2097152000 bytes exhausted (tried to allocate 20480 bytes) in /var/www/html/vendor/codeception/codecep
tion/src/Codeception/Subscriber/ErrorHandler.php on line 96

I was really stumped, but when I fetched the model again, everything worked fine:

$transaction = factory(Transaction::class)->create([
    'user_id' => $I->user->id,
]);

# refetch Transaction model
$transaction = Transaction::findOrFail($transaction->id)->first();

$I->sendGET('api/v1/transactions/'.$transaction->id);
$I->seeResponseCodeIs(HttpCode::OK);
$I->seeResponseContainsJson($transaction->toArray());

# print memory usage
echo "\n".format_byte_size(memory_get_usage());

26.79 mb