staghrm6/app/Models/ProTransaction.php

<?php

namespace App\Models;

# use Illuminate\Database\Eloquent\Model;

class ProTransaction extends Model
{
    protected $table = 'pro_transaction';

    public function client() {
        return $this->belongsTo(Client::class);
    }

    public function bill() {
        return $this->belongsTo(Bill::class);
    }

    public function pro() {
        return $this->hasOne(Pro::class, 'id', 'pro_id');
    }

    public function company() {
        return $this->hasOne(Company::class, 'id', 'company_id');
    }
}