laravel - 使用 $collection->filter() 过滤 Eloquent 集合数据

Question

我正在尝试使用集合filter()方法过滤以下集合:

$collection = Word::all();

JSON 输出如下所示:

[
{
"id": "1",
"word": "dog",
"phonetic": "dog",
"mean": "pies",
"assoc": "some example text",
"author_id": "3",
"user_id": "3"
},
{
"id": "2",
"word": "sun",
"phonetic": "sun",
"mean": "słońce",
"assoc": "lorem ipsun dolor sit amet",
"author_id": "3",
"user_id": "2"
}, ...
]

但是，在过滤集合时:

$filtered_collection = $collection->filter(function($item)
    {
        if($item->isDog())
        {
            return $item;
        }
 });

过滤后的集合 JSON 输出将如下所示:

 {"1":
 {
 "id": "1",
 "word": "dog",
 "phonetic": "dog",
 "mean": "pies",
 "assoc": "some example text",
 "author_id": "3",
 "user_id": "3"
 },
 "2":
 {
 "id": "2",
 "word": "sun",
 "phonetic": "sun",
 "mean": "słońce",
 "assoc": "lorem ipsun dolor sit amet",
 "author_id": "3",
 "user_id": "2"
 }}

过滤集合时如何保留原始 JSON 输出？我希望在过滤原始集合时拥有一组 Eloquent 模型实例。

Answer 1

集合的 filter 方法在底层数组上调用 array_filter，according to the PHP docs ，保留数组键。这会导致您的数组被转换为 JavaScript 对象而不是数组。

在集合上调用 values() 以重置底层数组上的键:

$filtered_collection = $collection->filter(function ($item) {
    return $item->isDog();
})->values();

<小时/>

旁注:在较新版本的 Laravel 中，您可以使用 higher order message将上面的内容缩短为:

$filtered_collection = $collection->filter->isDog()->values();