Modifiy response in laravel - php

Question

Below my Laravel controller code
public function templateValueData($template_id)
{
$parent = TemplateMetadataValue::where('template_id', $template_id)->get();
return $parent;
}
Here, the output of the method above;
[
{
"id": 11,
"parent_id": 0,
"name": "Category 1"
},
{
"id": 63,
"parent_id": 11,
"name": "Category 2"
},
{
"id": 73,
"parent_id": 63,
"name": "Category 3"
},
{
"id": 77,
"parent_id": 11,
"name": "Category 5"
},
{
"id": 83,
"parent_id": 77,
"name": "Category 8"
}
]
Now I want to format this response base on the value of parent_id.
The condition is: when parent_id is equal to id, then the parent_id is considered as children of the id.
Please note that both parent_id and id are stored as incremental values.
I want to alter and return the response as below;
[
{
"id": 11,
"parent_id": 0,
"name": "Category 1",
"children": [
{
"id": 63,
"parent_id": 11,
"name": "Category 2",
"children": [
{
"id": 73,
"parent_id": 63,
"name": "Category 3"
}
]
},
{
"id": 77,
"parent_id": 11,
"name": "Category 5",
"children": [
{
"id": 83,
"parent_id": 77,
"name": "Category 8"
}
]
}
]
}
]
How can I achieve this?

Answer 1

Use below code for achieve your response.
public function templateValueData($template_id)
{
$parents = TemplateMetadataValue::where('template_id', $template_id)->get();
$arr = $this->xyz($parents);
return $arr;
}
Function for achieve response.
function xyz($parents,$parent_id = 0){
$res = [];
foreach ( $parents as $parent ) {
if ( $parent[ "parent_id"] == $parent_id ){
$children = $this->xyz($parents, $parent[ "id"]);
if ($children) {
$parent[ "children"] = $children;
}
$res[]=$parent;
}
}
return $res;
}

Answer 2

You should call your relation on your controller:
public function templateValueData($template_id)
{
$parent = TemplateMetadataValue::where('template_id',$template_id)->with('children')->get();
return $parent;
}
Also you can use method injection on your controller methods, so you can use this code:
public function templateValueData(TemplateMetadataValue $template)
{
return $template->load('children')->get();
}

Answer 3

If you slightly modify your TemplateMetadataValue model then you could achieve the desired result.
class TemplateMetadataValue extends Model {
public function children() {
return $this->hasMany(static::class, 'parent_id');
}
}
Call it with children method.
$parent = TemplateMetadataValue::with('children')->get();
Rest of the login you can apply here with your query builder.