osb/app/Models/Rtm.php

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<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Factories\HasFactory;
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use Illuminate\Database\Eloquent\Model;
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use Illuminate\Support\Collection;
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class Rtm extends Model
{
use HasFactory;
protected $table = 'rtm';
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public $timestamps = FALSE;
/* RELATIONS */
/**
* Subordinate RTM entries
*
* @return \Illuminate\Database\Eloquent\Relations\HasMany
*/
public function children()
{
return $this->hasMany(self::class,'parent_id');
}
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/**
* Return all the children RTM records that this record is parent of
*
* @return Collection
*/
public function children_all(): Collection
{
$result = collect();
$result->push($this->withoutRelations());
foreach ($this->children as $o)
$result = $result->merge($o->children_all());
return $result;
}
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}