Pagination.php

<?php
/**
 * Created by PhpStorm.
 * User: mihail
 * Date: 15.08.18
 * Time: 10:34
 */

namespace App\Services;

use Illuminate\Contracts\Pagination\LengthAwarePaginator;
use Illuminate\Database\Eloquent\Builder;

class Pagination
{

    /**
     * @param Builder $builder
     * @param int|null $perPage
     * @param int $currentPage
     * @param string $orderColumn
     * @param string $sort
     * @param string $select
     * @param string $pageName
     * @return LengthAwarePaginator
     */
    public function ajax(
        Builder $builder,
        $perPage,
        $currentPage,
        $orderColumn,
        $sort = 'DESC',
        $select = '*',
        string $pageName = 'page'
    ): LengthAwarePaginator
    {

        $model = $builder->getModel();
        $fillable = $model->getFillable();
        $select = $select == '*' ? ['*'] : array_only(explode(',',$select), array_flip($fillable));

        $orderColumn = in_array($orderColumn, $fillable) ? $orderColumn : $fillable[0];
        $sort = strtoupper($sort) == 'ASC' ? 'ASC' : 'DESC';

        $select = collect($select)->reject(function ($name) {
            return empty($name);
        })->toArray();

        return $builder->select((empty($select)) ? ['*'] : $select)
            ->orderBy($orderColumn, $sort)
            ->paginate((int)$perPage, ['*'], $pageName, $currentPage);
    }

    public function defaultQuery(Builder $builder): LengthAwarePaginator
    {
        return $this->ajax(
            $builder,
            request()->input('perPage'),
            request()->input('page'),
            request()->input('orderBy'),
            request()->input('order'),
            request()->input('select')
        );
    }
}