在mongodb

Question

以下是mongodb系列。

   {
    "_id" : ObjectId("5aa12d5d9189602d4d4ce6e9"),
    "_class" : "com.dewsolutions.kp.lms.mongo.collections.Content",
    "body" : [
        {
            "lang" : "en",
            "title" : "Testing Lang in en",
        },
        {
            "lang" : "kk",
            "title" : "Testing Lang kk",
        },
        {
            "lang" : "ru",
            "title" : "Testing Lang ru",
        }
    ]
}

现在我需要一个查询，我将把语言参数传递给lang =＆＃34; ru＆＃34;它将返回相应的标题＆＃34; Testing Lang ru＆＃34;与_id。