Question

在我的mongo集合中，每个文档都包含一个数组，我想从正则表达式选择的数组中删除一些元素。例如，这是我的示例文档 -

{
    "_id" : ObjectId("590af6f3d8bf623afc5d63a6"),
    "tweet_ids" : [
        "795630746077634560",
        "776444730225729536",
        "788737667261427713",
        "788736764592742401",
        "788734782217879552",
        "799242145433415681",
        "824587491902685184",
        "803544932749295616",
        "781746625953890304",
        "826756800980590592",
        "847718025918726145",
        "848884360451424258",
        "809679010556997632"
    ],
    "user_id" : "776432864673923077",
    "color" : "b",
    "tweets" : [
        "NievesPérezSolórzano hat AlbertSánchezGraells retweetet",
        "Our thoughts on #Brexit #EUref @michcini @OUPPolitics The UK’S EU\nReferendum.The background, the vote and the impactpic.twitter.com/cy6h1mXT68",
        "NievesPérezSolórzano hat Raphaël Nowak retweetet",
        "NievesPérezSolórzano hat Esther Dermott retweetet",
        "NievesPérezSolórzano hat AlbertSánchezGraells retweetet",
        "2nd #eureferendum offers choice between #RemainINEU/Hard #Brexit minus https://theconversation.com/a-second-brexit-vote-is-a-real-possibility-now-heres-why-it-should-happen-68862 … @CardiffLaw @ConversationUK @bristolunilaw",
        "5 days to discuss #Article50 vs. 41 days #Maastricht 25 days #Lisbon & 39 original membership process #Brexit #parliamentsovereign #shameful",
        "Stijn Smismans: #Article50 QMV in #EUCouncil & #EP consent could be agreement 4 country 2 remain #Brexit #miller @UKSupremeCourt @ukcla",
        "New event Brexit, the UK & Bristol, 8th November @ 6pm @wshed #Brexit #Bristol @cpe_bristol @aejuncos @michcini @ShelleyNania @SPAISBristol",
        "An excellent account of how negotiations in the EU work by Sir Ivan Rogers @CommonsEU #Brexit",
        "NievesPérezSolórzano hat Rachel Minto retweetet",
        "NievesPérezSolórzano hat Noelle Quenivet retweetet",
        "NievesPérezSolórzano hat LSE Brexit retweetet"
    ]
}

我想删除那些具有以下正则表单形式的推文 -

[a-z].* hat [a-z].* retweetet

我找到了$regex，它将选择整个文档，我也看到this回答，但问题在于，数组包含json对象，并且它们正在删除该对象的特定键值。我怎样才能做到这一点？

Answer 1

您也可以将$pull用于任何查询条件，因此在这种情况下：

db.test.update({}, { $pull: { tweets: /[a-z].* hat [a-z].* retweetet/ }})

Answer 2

db.brexit_nodes_with_tweets.update（{}，{$ pull：{tweets：{$ regex：＆＃34; [a-zA-Z0-9]。* hat [a-zA-Z0-9]。* retweetet＆＃34;}}}，{多：真}）

在this

的帮助下

从正则表达式选择的数组中删除特定元素

2 个答案: