如何提取laravel MongoDB的子文档

Question

你好优秀的开发人员，

我使用jenssegers/laravel-mongodb包查询到Laravel我的MongoDB。

这里是捣鼓我的查询：https://mongoplayground.net/p/qzbNN8Siy-3

我有以下JSON

[{
    "id": "GLOBAL_EDUCATION",
    "general_name": "GLOBAL_EDUCATION",
    "display_name": "GLOBAL_EDUCATION",
    "profile_section_id": 0,
    "translated": [
      {
        "con_lang": "US-EN",
        "country_code": "US",
        "language_code": "EN",
        "text": "What is the highest level of education you have completed?",
        "hint": null
      },
      {
        "con_lang": "US-ES",
        "country_code": "US",
        "language_code": "ES",
        "text": "\u00bfCu\u00e1l es su nivel de educaci\u00f3n?",
        "hint": null
      }...
    {
     ....
    }
]

我试图运行下面的命令

db.collection.find({ 'id': "GLOBAL_EDUCATION" },{_id:0, id:1, general_name:1, translated:{ $elemMatch: {con_lang: "US-EN"} }})

期待导致这样的

[
  {
    "general_name": "GLOBAL_EDUCATION",
    "id": "GLOBAL_EDUCATION",
    "translated": [
      {
        "con_lang": "US-EN",
        "country_code": "US",
        "hint": null,
        "language_code": "EN",
        "text": "What is the highest level of education you have completed?"
      }
    ]
  }
]

一切都很好，而当我想这Laravel查询直接在商业方法，但问题出现。我试着从MongoDB的包装每一个可能的已知功能。但不能够做到这一点。这里是我的阵

$findArray = [
        [
            'id' => "GLOBAL_EDUCATION",
        ],
        [
            '_id' => 0,
            'id' => 1,
            'general_name' => 1,
            'translated' => [
                '$elemMatch' => ['con_lang' => "US-EN"]
            ],
        ]
];

$model = GlobalQuestions::raw()->find($findArray) //OR
$data = GlobalQuestions::raw(function($collection) use ($findArray){
        return $collection->find($findArray);
});

我在做什么错在这里，就是这种寻找的（）不可能在这里，我已经通过聚集来做到这一点？

Answer 1

由于没有人回答了这个，我张贴，如果有人有同样的问题解决方案。这样做在同一些R＆d我能够where做到这一点使用Project和Aggregation Pipelines为好。

-----使用Where（）和项目（）------

$projectArray = [
    '_id' => 0,
    'id' => 1,
    'general_name' => 1,
    'translated' => [
        '$elemMatch' => ['con_lang' => "FR-FR"]
    ],
];

$data = GlobalQuestions::where('id', '=', 'GLOBAL_EDUCATION')
    ->project($projectArray)
    ->get();

---使用聚合和$放松---

$data = GlobalQuestions::raw(function($collection) {
    return $collection->aggregate([
        [
            '$match' => [
                'id' => "GLOBAL_EDUCATION"
            ]
        ],
        [
            '$unwind' => '$translated',
        ],
        [
            '$match' => [
                'translated.con_lang' => "US-EN"
            ]
        ],
        [
            '$project' => [
                '_id'=> 0,
                'id'=> 1,
                'general_name' => 1,
                'translated' => 1,
            ]
        ]
    ]);
})->first();