autocde2.0/app/ModelFilters/CustomFieldFilter.php

<?php

namespace App\ModelFilters;

use EloquentFilter\ModelFilter;

class CustomFieldFilter extends ModelFilter
{
    /**
    * Related Models that have ModelFilters as well as the method on the ModelFilter
    * As [relationMethod => [input_key1, input_key2]].
    *
    * @var array
    */
    public $relations = [];

    public function group($group)
    {
        return $this->where("group", $group);
    }

    public function key($key){
        return $this->where("key", "like", "%$key%");
    }

    public function batch($batch)
    {
        $in = [];
        foreach ($batch as $item) {
            $in[] = sprintf("'%s'", $item);
        }

        return $this->whereRaw(sprintf("concat(`group`, '.', `key`) in (%s)", implode(',', $in)));
    }
}