Laravel-datatables: Search: Retrieving attribute via id

Summary of problem or feature request

One-To-Many Relationship asserted via storing id of owning entity in table of many entity. E.g.: coordinator manages one or many centers. After setting the columns via the html builder, I edit the coodinator_id column and apply an accessor method to retrieve the coordinators full name:

public function getFullNameAttribute()
{
    return $this->first_name . ", " . $this->last_name;
}

My aim is to allow only the centers that belong to the authenticated coordinator to be displayed on the datatable unless the authenticated user is an admin as shown in my queries.
However, if I enter the value of the Coordinator column that appears on the datatable it says no matching records found.

How do I achieve this?

Code snippet of problem

<?php

namespace App\DataTables;
use Auth;
use App\Center;
use App\Coordinator;
use Yajra\Datatables\Services\DataTable;

class CentersDataTable extends DataTable
{
    // protected $printPreview  = 'path.to.print.preview.view';

    /**
     * Display ajax response.
     *
     * @return \Illuminate\Http\JsonResponse
     */
    public function ajax()
    {
        return $this->datatables
            ->eloquent($this->query())
            ->editColumn('action', function ($center) {
                return '<a href="edit-center/'.$center->id.'" <i class="material-icons sideicons-tables">create</i>'; 
               // <a href="field-technician-delete/'.$user->id.'" <i class="material-icons sideicons-tables">delete</i>
            })
            ->editColumn('coordinator_id', function ($user) {
                return Coordinator::find($user->coordinator_id)->full_name;
                })
            ->editColumn('gps_lat', function ($center) {
                    return $center->gps_location ;
                })
            ->make(true);
    }

    /**
     * Get the query object to be processed by datatables.
     *
     * @return \Illuminate\Database\Query\Builder|\Illuminate\Database\Eloquent\Builder
     */
    public function query()
    {
        if(Auth::user()->hasRole('admin')){
        $centers = Center::query();
        return $this->applyScopes($centers);
        }
        else{
            $centers = Center::query()->where('coordinator_id',Auth::user()->userable->id);
            return $this->applyScopes($centers);
        }
    }

    /**
     * Optional method if you want to use html builder.
     *
     * @return \Yajra\Datatables\Html\Builder
     */
    public function html()
    {
        return $this->builder()
             ->columns([
                'id' => ['title' => 'ID'],
                'center_name' => ['title' => 'Name'], 
                'gps_lat' => ['title' => 'Coordinates'],
                'contact_no' => ['title' => 'Contact Number'],
                'coordinator_id' => [
                            'title' => 'Coordinator',
                            'searchable' => true
                ],
                'created_at' => [ 'title' => 'Created'],
                 'updated_at' => ['title' => 'Updated'], 
                'action' => [
                             'data'           => 'action',
                            'name'           => 'action',
                            'render'         => null,
                            'orderable'      => false,
                            'searchable'     => false,
                            'exportable'     => false,
                            'printable'      => false
                             ]
             ])
             ->parameters([
                 'dom' => 'Bfrtip',
                 'buttons' => ['csv', 'excel', 'print','reload'],
             ]);
    }

    /**
     * Get columns.
     *
     * @return array
     */
    private function getColumns()
    {
        return [
            'id',
            // add your columns
            'created_at',
            'updated_at',
        ];
    }

    /**
     * Get filename for export.
     *
     * @return string
     */
    protected function filename()
    {
        return 'centers';
    }
}

System details

• Operating System : OS X El Capitan 10.11.5
• PHP Version : 7.0.0
• Laravel Version : 5.1.36 (LTS)
• Laravel-Datatables Version : 6.11.5

Regards,