在 Eloquent 中按自定义顺序对集合进行排序

2021-12-26 00:00:00 arrays php laravel eloquent

我有一组 ID，如下所示:

I have an array of ID's as follows:

$ids = [5,6,0,1]

使用 Eloquent，我可以使用 ->whereIn('id', $ids) 函数搜索这些 Id.正如预期的那样，这将按 Id 以升序返回结果，有没有办法可以按数组所在的顺序返回结果?或者，按 $ids 数组的顺序转换集合的最简单方法是什么?

Using Eloquent I am able to search for these Id's using the ->whereIn('id', $ids) function. This as expected will return the results in the ascending order by Id, is there a way I can return the results on the order the array is in? alternatively whats the easiest way to convert the collection in the order of the $ids array?

推荐答案

如果您希望记录按特定顺序排列，则必须使用 收集方法:

If there's a specific order you'd like the records in, you'd have to use the Collection Methods:

要按照您指定的特定顺序获取 ID，您可以使用 sortBy 方法，如下所示，其中 collection 是您的模型集合:

To get your ID's in the very specific order you've specified, you can make use of the sortBy method as follows, where collection is your collection of models:

$ids = [ 5, 6, 0, 1];

$sorted = $collection->sortBy(function($model) use ($ids) {
    return array_search($model->getKey(), $ids);
});

// [ 5, 6, 0, 1] // (desired order)

要随机化您的集合，您可以使用 shuffle 方法.

To randomize your collection you can make use of the shuffle method.

$collection = collect([1, 2, 3, 4, 5]);

$shuffled = $collection->shuffle();

$shuffled->all();

// [3, 2, 5, 1, 4] // (generated randomly)

请参阅 shuffle 上的 Laravel 文档 和/或 sortBy 以获得更具体的要求.

See the Laravel Docs on shuffle and/or sortBy for more specific requirements.

如果您没有真正考虑特定的顺序，您可以在 5.2 及更高版本中使用 ->inRandomOrder()，旧版本将需要使用 - 的原始查询>orderBy(DB::raw('RAND()')).

If you don't really have a specific order in mind, you can use ->inRandomOrder() in version 5.2 and up, older versions would require the raw query using ->orderBy(DB::raw('RAND()')).

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