public function paginate(Request $request)
    {
        $params = $request->all();
        $department = Department::with('company', 'establishment', 'location');
        $path = 'department';

        if (Auth()->user()->isCompanyAdmin() && !Auth()->user()->isNSUser())
        {
          $department = $department->where('departments.company_id', Auth()->user()->company_id);
        }

        if ($request->input('columns') !== null) {
            foreach ($request->input('columns') as $index => $column) {
                if ($column['searchable'] === 'true') {
                    $value = $column['search']['value'];

                    if($params['draw'] != 1 && $value == null)
                    {
                        $request->session()->forget($path . '.' . $index);
                    }

                    if(strlen($value) > 0) {
                        $request->session()->put($path . '.' . $index, $value);
                    } else {
                        if($params['draw'] == 1) {
                            $value = $request->session()->get($path . '.' . $index);
                        }
                    }

                    if (strlen($value) > 0 && strcmp($value, 'null') != 0) {
                        if (strpos($column['data'], '.') > -1) {
                            $table = explode('.', $column['name'])[0];
                            $field = explode('.', $column['data'])[1];
                            if ($field == '[]') {
                                $field = explode('.', $column['data'])[2];
                            }

                            $name = explode('.', $params['columns'][$index]['data'])[0];
                            $department = $department->whereHas($name, function ($q) use ($table, $field, $value) {
                                $q->where($table . '.' . $field, 'LIKE', '%' . $value . '%');
                            });
                        } else {
                            $department = $department->where('departments.' . $column['data'], 'LIKE', '%' . $value . '%');
                        }
                    }
                }
            }
        }

        $params['order'] = $params['order'][0];
        if(isset($params['order']['column']) && isset($params['order']['dir'])) {
            if($params['draw'] == 1) {
                $column_name = $request->session()->get($path . '.order.column');
                $order = $request->session()->get($path . '.order.dir');

                if(strlen($column_name) == 0) {
                    $column_name = $params['columns'][$params['order']['column']]['name'];
                }
                if(strlen($order) == 0) {
                    $order = $params['order']['dir'];
                }
            } else {
                $column_name = $params['columns'][$params['order']['column']]['name'];
                $order = $params['order']['dir'];
                $request->session()->put($path . '.order.column', $column_name);
                $request->session()->put($path . '.order.dir', $order);
            }

            if (strpos($column_name, '.') === false) {
                $department = $department->orderBy($column_name, $order);
            } else {
                $table = explode('.', $column_name)[0];
                $name = "";

                foreach($params['columns'] as $index => $column) {
                    if($column_name == $column['name']) {
                        $name = explode('.', $params['columns'][$index]['data'])[0];
                        $request->session()->put($path . '.order.index', $index);
                    }
                }

                $department = $department->join($table, 'departments.' . $name . '_id', '=', $table . '.id')
                    ->orderBy($table . '.name', $order)->select('departments.*');
            }
        }

        $perPage = 20;

        if(!empty($params['length'])) {
            $perPage = $params['length'];
            $request->session()->put($path.'.perPage', $perPage);
        }

        $page = 1;
        if ($request->input('start') > 0)
        {
            $page = ($request->input('start') / $perPage) + 1;
        }

        if($params['draw'] == 1) {
            $currentPage = session()->get($path . '.currentPage');

            if(strlen($currentPage) > 0) {
                $page = $currentPage;
            }
        }

        session()->put($path . '.currentPage', $page);

        Paginator::currentPageResolver(function() use ($page) {
            return $page;
        });

        $department = $department->paginate($perPage);
        return response($department)->header('X-Total-Count',$department->total());
    }