如何在Laravel中将集合或自定义查询分页为API json?

我将其保存在app\Core\Helpers类中,以便可以从任何地方将其称为\app\Core\Helpers::makePaginatorForCollection($query\u results)。最有可能使用它的地方是处理复杂查询的控制器的最后一行。

在app/Http/Controllers/simpleExampleController.php中

/**
 * simpleExampleController
 **/
public function myWeirdData(Request $request){
    $my_unsafe_sql = '...';//never do this!!
    $result = DB::statement(DB::raw($my_unsafe_sql));
    return \App\Core\Helpers::makePaginatorForCollection($result);
}

/**
 * This will match laravel's built in Model::paginate()
 * because it uses the same underlying code.
 *
 * @param \Illuminate\Support\Collection $collection
 *
 * @return \Illuminate\Pagination\LengthAwarePaginator
 */
public static function makePaginatorForCollection(\Illuminate\Support\Collection $collection){
    $current_page = (request()->has('page')? request()->page : 1) -1;//off by 1 (make zero start)
    $per_page = (request()->has('per_page')? request()->per_page : config('api.pagination.per_page')) *1;//make numeric
    $page_data = $collection->slice($current_page * $per_page, $per_page)->all();

    return new \Illuminate\Pagination\LengthAwarePaginator(array_values($page_data), count($collection), $per_page);
}

/**
 * Copy and refactor makePaginatorForCollection()
 * if collection building is too slow.
 *
 * @param $array
 *
 * @return \Illuminate\Pagination\LengthAwarePaginator
 */
public static function makePaginatorForArray($array){
    $collection = collect($array);

    return self::makePaginatorForCollection($collection);
}