如何在Laravel中将集合或自定义查询分页到API json中? [英] How do I paginate a collection or custom query into API json in Laravel?
问题描述
我有一个复杂的查询,该查询不基于我想对输出进行分页的任何特定模型表.但是,laravel内置的分页依赖于模型和表格.我该如何对集合进行分页并使其输出与laravel内置的分页输出格式相匹配?
I have a complex query that is not based on any specific model table that I want to paginate output for. However laravel's built in pagination relies on models and tables. How can I paginate a collection and have the output match up with laravel's built in pagination output format?
推荐答案
我将其保存在app \ Core \ Helpers类中,以便可以从任何地方调用\ App \ Core \ Helpers :: makePaginatorForCollection($ query_results) .最可能使用它的地方是处理复杂查询的控制器的最后一行.
I keep this in an app\Core\Helpers class so that I can call them from anywhere as \App\Core\Helpers::makePaginatorForCollection($query_results). The most likely place to use this is the last line of a controller that deals with complex queries.
在app/Http/Controllers/simpleExampleController.php
In app/Http/Controllers/simpleExampleController.php
/**
* 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);
}
在app \ Core \ Helpers.php或您希望自动加载的任何位置.
In app\Core\Helpers.php or anywhere you like that auto loads.
/**
* 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);
}
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