Save Eloquent model requires to convert to array

I have got the following piece of code inside a Repository class, which saves the model into the DB. However, that fails systematically.

 /**
     * Saves the subscriber
     * @param $subscriber
     * @return void
     */
    public function save($subscriber)
    {
        // \DB::table('subscribers')->insert($subscriber)->toArray();

        $this->subscriberModel->save($subscriber);
    }

An alternative option that I found is commented out, which fails too.

The exception message that I receive is:

Argument 1 passed to Illuminate\Database\Eloquent\Model::save() must be of the type array, object given, ...

Update

I should point out that I am fairly new to Laravel, and wondering what are the common ways in Laravel to sort this out?

Update 2

I have saved the object, but had to use the following piece of code inside save($subscriber) :

 $subscriberArray = [ "id" => $subscriber->getId(),
                             "email" => $subscriber->getEmail(),
                             "subscriber_source_id" => $subscriber->getSubscriberSourceId()
        ];

        \DB::table('subscriber')->insert($subscriberArray);

This doesn't really help me to undestand the reason that I have to convert it to array first.

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