laravel collect function is undefined - php

Question

i am getting data from database which in need to group so i am converting database result set in to array and then passing it to laravel collect helper but i gives me error
Call to undefined function collect()
Code
$user_profile=collect(UserProfileItem::where('type', "age_group")->get()->toArray())->groupBy("age_group");
please help me about what i am doing wrong i want to use laravel collections method groupby to group my database result array by "age_group"
like below data group by account_id
[
'account-x10' => [
['account_id' => 'account-x10', 'product' => 'Chair'],
['account_id' => 'account-x10', 'product' => 'Bookcase'],
],
'account-x11' => [
['account_id' => 'account-x11', 'product' => 'Desk'],
],
]

Answer 1

You dont need to add collect function as you are already getting a collection. So you need to do it as :
$user_profile = UserProfileItem::where('type', "age_group")->get()->groupBy("age_group");

Answer 2

you need to first get the groups and loop through them and add data in those to the collection
$groups = UserProfileItem::groupBy("age_group")->get();
$collection = collect();
foreach($groups as $group){
$data = UserProfileItem::where('type', $group->type)->get();
$collection->put($group->type , $data);
}
return $collection;

Answer 3

i think for previous version of laravel creating your own group is the only solution
public function getGroupedUser($group="age_group"){
$users = $this->users->keyBy('id')->toArray();
$user_profile=UserProfileItem::where('type', "age_group")->get()->groupBy("age_group");
foreach ($user_profile as $row){
$urow[$row['data']][]=$row;
}
echo "<pre>";
print_r($user_profile);die;
}