stagfe2/app/Models/StatTreeLine.php

<?php

namespace App\Models;

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

class StatTreeLine extends Model
{
    protected $table = 'stat_tree_line';
    public $timestamps = false;

    public function lineClauses(){
        return $this->hasMany(StatTreeLineClause::class, 'stat_tree_line_id', 'id');
    }
    public function statTree(){
        return $this->hasOne(StatTree::class, 'id', 'stat_tree_id');
    }
    public function parent(){
        return $this->hasOne(StatTreeLine::class, 'id', 'parent_stat_tree_line_id');
    }
    public function children(){
        return $this->hasMany(StatTreeLine::class, 'parent_stat_tree_line_id', 'id')
            ->orderBy('tree_order_position_index');
    }
    public function displayLabel() {
        $lastStatTreeLineClause = StatTreeLineClause::where('stat_tree_line_id', $this->id)
            ->orderBy('position_index', 'DESC')
            ->first();
        if($lastStatTreeLineClause) {
            return $lastStatTreeLineClause->clause_label;
        }
        return '-';
    }
}