stagfe2/app/Models/Pro.php

<?php

namespace App\Models;

# use Illuminate\Database\Eloquent\Model;

class Pro extends Model
{
    protected $table = 'pro';

    public function cmBills()
    {
        return $this->hasMany(Bill::class, 'cm_pro_id');
    }


    public function hcpBills()
    {
        return $this->hasMany(Bill::class, 'hcp_pro_id');
    }

    public function lastPayment() {
        return ProTransaction
            ::where('pro_id', $this->id)
            ->where('plus_or_minus', 'PLUS')
            ->orderBy('created_at', 'desc')
            ->first();
    }
}