Laravel get MySQL to query Builder statement in Eloquent model - mysql

Question

Given the following table:
+----+----------+------------+
| id | parent_id| Name |
+----+----------+------------+
| 1 | NULL | Parent 1|
| 2 | 1 | Child 1|
| 3 | 1 | Child 2|
| 4 | 1 | Child 3|
| 5 | NULL | Parent 2|
| 6 | 1 | Child 4|
| 7 | 1 | Child 5|
| 8 | 1 | Child 6|
+----+----------+------------+
I want to select the same data, even if the provided ID is a parent or not.
So the provided ID = 1 (parent) or if the ID = 3 (child) I want to select this exact same data:
+----+----------+------------+
| id | parent_id| Name |
+----+----------+------------+
| 1 | NULL | Parent 1|
| 2 | 1 | Child 1|
| 3 | 1 | Child 2|
| 4 | 1 | Child 3|
+----+----------+------------+
I have a working MySQL query for it:
SELECT * FROM packages
WHERE id = 3
OR parent_id = 3
OR parent_id = (SELECT parent_id FROM packages WHERE id = 3)
OR id = (SELECT parent_id FROM packages WHERE id = 3)
So if you replace 3 with 1 you get the same results as expected.
I have already the following function in my Package Model:
<?php
public function related()
{
$childParent = Package::select( 'parent_id' )->where( 'id', $this->id )->first();
$query = $this->where( 'id', $this->id )
->orWhere( 'parent_id', $this->id );
if ( null !== $childParent->parent_id ) {
$query
->orWhere( 'parent_id', $childParent->parent_id )
->orWhere( 'id', $childParent->parent_id );
}
return $query;
}
But this feels... well... ugly. I am coming from Symfony where this kind of queries can get easily build (and with little codelines) with the ORM query builder.
Are I am missing a feature in Laravel Eloquent to make this nice and short?
Edit: I got already these functions which fall both short at not selecting the other children and eventual parent:
<?php
public function parent()
{
return $this->belongsTo( Package::class, 'parent_id' )->withTrashed();
}
public function childs()
{
return $this->hasMany( Package::class, 'parent_id' );
}

Answer 1

This is the perfect use-case for a relationship:
public function parent() {
$this->belongsTo(self::class, 'parent_id');
}
public function children() {
$this->hasMany(self::class, 'parent_id');
}
$parent = Model::with('children')->find(1); // with eager loading
$parent->children;
Hope this helps.