Description

In https://docs.mongodb.com/manual/core/document/ I saw that "The field names cannot contain the dot (.) character." but I have managed to insert broken documents using the default code options of the nodejs 3.0.6 driver.

Steps to reproduce

• Install the environment :
  1. mongodb 3.2.18, node v8.11.1, npm 5.6.0, ubuntu 12.04
  2. package.json

  "dependencies": {
      "mongodb": "^3.0.6",
  }
  

• Run the following index.js file:

  const {MongoClient} = require('mongodb');
  
  const uri = 'mongodb://localhost:27017/admin';
  
  (async () => {
  
      const client = await MongoClient.connect(uri);
      const db = client.db('test');
  
      let records = [{
          "a.b.c": 1
      }, {
          "d.e": 1
      }
      ];
  
      await db.collection("sample").insertMany(records);
  
      let dbRecords = await db.collection("sample").find({}).toArray();
      console.log(dbRecords);
  
  })();
  

Found results

[ { _id: 5ad05493f5f7cfd420a2ac44, 'a.b.c': 1 },
  { _id: 5ad05493f5f7cfd420a2ac45, 'd.e': 1 } ]

Expected Results

An error should be thrown by the driver like in version 2.2.X

Workaround

From what I see, the users must explicitly pass the :

{
   checkKeys:true 
}

to the options parameter of the insertMany function.

Notes

• From my research, the source of the bug is here : https://github.com/mongodb-js/mongodb-core/blob/3.0.0/lib/wireprotocol/3_2_support.js#L68
• It seems that checkKeys defaults to false
• If this is intended, please update the documentation ( https://github.com/mongodb/node-mongodb-native/blob/3.0.0/CHANGES_3.0.0.md )