jandl-taskmanager-app/be/app/Models/Project.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class Project extends Model
{
    use HasFactory;

    public $timestamps = true;

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

    public function mastertasks()
    {
        return $this->hasMany(MasterTask::class, 'master_task_id');
    }
}