datatable yajra laravel eloquent not working

I am using datatable yajra package in my project lravel 5.1 and wants to get data through laravel eloquent this is my suggestion model code.

public function candidate()
    {
                return $this->belongsTo('App\Candidate', 'suggested_user');
    } 

And this is controller code.

public function getBCReport()
    {
$candidates = \App\Suggestion::with('candidate')->get();
return Datatables::of($candidates)
    ->make(true);
    }

And this is my view code:

<

div class="panel-body">
        <div class="candidatereport">
            <div class="table-responsive">                             
                <table class="table display" id="table_id"  cellspacing="0" width="100%">
                    <thead>
                      <tr>
                        <th>First Name</th>
                        <th>Last Name</th>

                      </tr>
                    </thead>
                    <tbody>
                    </tbody>
                </table>
            </div>
        </div>
    </div>
</section>
<script>
$(function() {
    $('#table_id').DataTable({
        processing: true,
        serverSide: true,
        dataType: 'json',
        ajax: '{!! route('datatables.candidatereport') !!}',
        columns: [
            { data: 'candidate.fname', name: 'fname' },
            { data: 'candidate.lname', name: 'lname' },

        ]
    });
});
</script>

In controller when I use this code $candidates = \App\Suggestion::with('candidate'); According to datatable yajra documentation http://ift.tt/1ojrMaw it’s not working butt when I use with $candidates = \App\Suggestion::with('candidate')->get(); Its working butt this is not according to datatable yajra documentation. Can any one tell what is the reason behind this. Thanks

enter code here

via Chebli Mohamed