How can I select certain columns from my recursive child call - php

Question

I'm pretty new to Eloquent and I'm having issues wrapping my head around something.
Basically I have a table which I'm recursively grabbing children from within the same table.
public function children() {
return $this->hasMany(static::class, 'parent_org_id');
}
public function childrenRec()
{
return $this->children()->with('childrenRec');
}
Where childrenRec is a recursive call to all children based on 'parent_org_id'
I'm calling it from the following in a static function, as of right now I only want the id and the name_en of the org
self::select('id','name_en')->where('parent_org_id','=',0)->with('childrenRec')->get()->toArray();
which is grabbing the top level org (my top level org has a parent_org_id of 0).
My issue is that in the recursively grabbed children it doesn't limit it to the id and the name_en
My question boils down to:
How can I select only certain columns from my recursive child calls, as well is this the 'proper' way of doing things?
My returned array looks like this.
array:1 [▼
0 => array:4 [▼
"id" => 1
"name_en" => "Org Unit"
"org_type" => null
"children_rec" => array:2 [▼
0 => array:27 [▼
"id" => 2
"name_en" => "My First Orgunit."
"code" => null
"abbreviation" => null
"address1" => "222 Street Street"
"address2" => null
"city_id" => 1
"province_id" => 14
"postalcode" => "C161L7"
"country_id" => 38
"contact_name" => null
"contact_title" => null
"email" => "test#test.com"
"fax" => "902-555-5555"
"phone1" => "5125125125125"
"phone2" => null
"org_type_id" => 1
"parent_org_id" => 1
"ref_id" => 79
"has_users" => 1
"created_at" => "2016-11-02 18:47:55"
"updated_at" => "2016-11-02 18:47:55"
"org_type" => array:4 [▶]
"children_rec" => array:1 [▶]
]
1 => array:27 [▶]
]
]
]
Thanks in advance.

Answer 1

To access the relation query in the with() method you use an array with the name of the relationship as the key and a closure with an instance of QueryBuilder injected.
One 'gotcha' that took me forever to track down a solution to when doing this is, your parent and children queries need to include the key that associates their relationship because the models are attached/associated with each other after both queries are run separately. Those models are associated with each other using the columns defined in the relation on the model. Without the columns used in the association of the models in your query, the related models won't be attached. In your situation it would be:
self::select('id','name_en')
->where('parent_org_id','=',0)
->with(['childrenRec' => function($query) {
return $query->select('id', 'name_en', 'parent_org_id');
}])
->get()
->toArray();
If you don't include the parent_org_id in the subquery the relationships won't get attached.
Docs

Answer 2

Try this:
public function childrenRec()
{
return $this->children()->with(['childrenRec' => function($query){
$query->select('id','name_en');
}]);
}