Method addSelect does not exist - methods

Question

I'm getting this error message when I try to do a addSelect method in Laravel 5.2
Any ideas?
BadMethodCallException in Macroable.php line 74:
Method addSelect does not exist.
Here is the function in my controller
public function summaryOfMembersTable()
{
$members = MotherProfile::select('last_name')
->orderBy('last_name','ASC')
->distinct()
->get();
$count = $members->count();
$mothers = MotherProfile::select(DB::raw('count(*) as user_count, gender'))
->where('gender', '<>', 'F')
->groupBy('gender')
->get();
$fullnames = $members
->addSelect('first_name')
->orderBy('last_name','ASC')
->distinct()
->get();
$data = [];
$data['members'] = $members;
$data['memberCount'] = $count;
$data['mothers'] = $mothers;
$data['fullnames'] = $fullnames;
return view( 'user/masterlist/summary-of-members', $data);
}
My blade:
Total is {{ $memberCount }}
#foreach ($fullnames as $fullname)
{{ $fullname }}<br>
#endforeach
<hr>
<div class="page-header" style="text-align:center;">
<h3 class="pageHeader">
List of Members
<br>
</h3>
</div>
<div class="row">
<table class="table table-bordered" style="text-align: left;">
<tr>
<th></th>
<th>Full Name (Last, First, Middle)</th>
<th>KLC</th>
<th>Category</th>
<th>Mem Type</th>
<th>Mem Status</th>
<th>Date Baptized</th>
<th>Mother in Spirit</th>
<th>Encoder</th>
</tr>
<tbody>
</tbody>
</table></div>

Answer 1

you are getting a collection instead of an object. addSelect method belong to builder object not to collection. So remove get() from your query and you'll be fine.
$members = MotherProfile::select('last_name')
->orderBy('last_name','ASC')
->distinct()
->get();

Answer 2

$members = MotherProfile::select('id','last_name')
->orderBy('last_name','ASC')
->distinct()
->addSelect(DB::raw("'value' as nameFake"))->get();
before to get()