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I'm trying to make an array on my contact list, basing on my message table fromContact relation:

    $messages = Message::where('offer_id', $id)->get();
    $contacts = array();
    foreach($messages as $message){
      $contacts[] = $message->fromContact;
next I'm trying to make a map on contact, using $unreadIds that are result of other query on messages table: 
    $contacts = $contacts->map(function($contact) use ($unreadIds) {
        $contactUnread = $unreadIds->where('sender_id', $contact->id)->first();
        $contact->unread = $contactUnread ? $contactUnread->messages_count : 0;
        return $contact;
and this is not working... I've got simply message with error: 
Call to a member function map() on array
and I understand it, I should not use map() on array - so I tried many ways to convert it to object - all failed. 
for example 
converting contacts into object after array loop
 $contacts = (object)$contacts;
gives error: "message": "Call to undefined method stdClass::map()",
Maybe anyone knows how to fix that?
$collection->map(function($contact) use ($unreadIds) {
    $contactUnread = $unreadIds->where('sender_id', $contact->id)->first();
    $contact->unread = $contactUnread ? $contactUnread->messages_count : 0;
    return $contact;
https://laravel.com/docs/5.6/collections
        
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