mongodb找到具有共同价值的所有文件

Question

如何查找具有共同＆＃39;类别＆＃39;

的所有文档

以下是我的示例文档。如何获取类别中常见的文档？

{
    "_id": {
        "$oid": "59b7fcace893d0450c44ada3"
    },
    "title": "Tesla model 3 questions",
    "category": "movie",
    "questionAndAnswers": '',
    "__v": 0
}
{
    "_id": {
        "$oid": "59c4e12fd5276138f41c0896"
    },
    "title": "SpaceX Quiz",
    "category": "Science",
    "questionAndAnswers": '',
"__v": 0
}
{
    "_id": {
        "$oid": "59c4e12fd5276138f41c0890"
    },
    "title": "Nasa Quiz",
    "category": "Science",
    "questionAndAnswers": '',
"__v": 0
}

Answer 1

db.collection.find({"category": "Science"})将返回一个光标，您可以迭代该光标以获取所有文档＆＃34; category＆＃34;是＆＃34;科学＆＃34;。

检查 - https://docs.mongodb.com/manual/reference/method/db.collection.find/#find-documents-that-match-query-criteria

Answer 2

只需使用where category == 'theCommonCategory'.

即可

它将为您提供具有CommonCategory的所有文档。