autocde2.0/app/Models/ApprovalFlow.php

<?php

namespace App\Models;

use App\Http\Requests\IndexHelper;
use App\Models\Enums\DisplayIndexObjectType;
use App\Models\Scopes\CompanyScope;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;

class ApprovalFlow extends Model
{
    use HasFactory, SoftDeletes;

    protected $fillable = [
        'name', 'object_type', 'object_id', 'nodes', 'nodes_config', 'created_by',
    ];

    protected $casts = [
        'nodes' => 'array',
    ];

    protected static function booted(): void
    {
        static::addGlobalScope(new CompanyScope);

        static::creating(function (ApprovalFlow $approvalFlow){
            $type =DisplayIndexObjectType::APPROVALFLOW;
            $displayIndex = IndexHelper::getObjectMaxIndex($type);
            $approvalFlow->display_id =$displayIndex;
        });
    }

    public function createdBy()
    {
        return $this->belongsTo(User::class, "created_by");
    }
}