Mongo Find()函数不会排除_id [英] Mongo Find() function won't exclude _id

问题描述

你好，我似乎无法使排除_id正常工作，这是代码

Hello I can't seem to get the exclude _id to work, here is the code

const findLabels = (db, cb) => {
  // Get the documents collection
  const collection = db.collection(documentName);

  // Find some documents
  collection.find({}, { _id: 0 }).toArray((err, docs) => {
    // An error occurred we need to return that to the given 
    // callback function
    if (err) {
      return cb(err);
    }

    assert.equal(err, null);
    console.log("Found the following records");
    console.log(docs)

    return cb(null, docs);
  });
}

这是控制台日志上的输出

Here is the output on the console log

Found the following records
[ { _id: 5a5ee78cc130e727a3b1fdb6, name: 'Downgradeklajds' },
  { _id: 5a5ee794c130e727a3b1fdb7, Pizel: '00:00:07' } ]

我哪里出错了?

推荐答案

我认为指定投影的正确方法是使用"fields"或"projection"属性，具体取决于驱动程序的版本.

I think the correct way to specify a projection is to use the "fields" or "projection" property, depends on the version of your driver.

collection.find({}, {projection:{ _id: 0 }})

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