ldc-supportweb/app/Models/Schedule.php

<?php

namespace App\Models;

use App\Enums\Planning\ActivityTypeEnum;
use App\Enums\Planning\CellModelEnum;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

/**
 * @property User $user_id
 * @property date $date
 * @property integer $slot
 * @property ActivityTypeEnum $activity
 * @property string $description
 * @property Ticket|Site|Projet $id_lie
 * @property CellModelEnum $model_lie
 */
class Schedule extends Model
{
    use HasFactory;

    /**
     * The attributes that are fillable.
     *
     * @var array
     */
    protected $fillable = [
        'user_id',
        'date',
        'slot',
        'activity',
        'description',
        'id_lie',
        'model_lie'
    ];

    /**
     * The attributes that should be cast.
     *
     * @var array
     */
    protected $casts = [
        'date' => 'date',
        'activity' => ActivityTypeEnum::class,
        'model_lie' => CellModelEnum::class
    ];

    // * RELATIONSHIPS

    /**
     * BelongsTo User relation
     *
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function user()
    {
        return $this->belongsTo(User::class);
    }

    /**
     * Relationship to linked objet
     *
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function relatedModel()
    {
        switch ($this->model_lie->value) {
            case 'sites':
                return $this->belongsTo(Site::class, 'id_lie');
            case 'projects':
                return $this->belongsTo(Project::class, 'id_lie');
            case 'tickets':
                return $this->belongsTo(Ticket::class, 'id_lie');
            default:
                return new BelongsTo($this->newQuery(), $this, '', '', '');
        }
    }
}