Question

我的文档如下：

{
    _id: "57008339e7537f033b67cf84",
    title: "my title",
    urls: ["1.html", "2.html", "3.html"]
}

我想从"2.html"中移除urls。引用this question我尝试过以下代码：

db.collection("bookmarks").update({_id: "57008339e7537f033b67cf84"}, {$pull: {"urls": {$eq: "2.html"}}}, (err, result) => {
    if (err) {
        console.log(err);
    }
});

但输出是：

{ [MongoError: unknown top level operator: $eq]
  name: 'MongoError',
  message: 'unknown top level operator: $eq',
  driver: true,
  index: 0,
  code: 2,
  errmsg: 'unknown top level operator: $eq' }

Answer 1

您不需要$eq运营商：

只需使用{$pull: {"urls": "2.html"}}

即可

db.collection("bookmarks").update({_id: "57008339e7537f033b67cf84"}, {$pull: {"urls": "2.html"}}, (err, result) => {
    if (err) {
        console.log(err);
    }
});

$pull文档

从MongoDB中的数组中删除原始元素？

1 个答案: