laravel multiple relationships same model code example

Example 1: comparison of two tables in laravel using model

$paidFeesIds = Fee::whereHas('paidFees', function($q) {
    $q->where('payment_status', 1);
})->pluck('id')->toArray();

$notPaidFeesIds = Fee::whereNotIn('id', $paidFeesIds)->pluck('id')->toArray();

Example 2: comparison of two tables in laravel using model

public function paidFees()
{
    return $this->hasMany(PaidFees::class, 'fee_id');
}