JavaScript包含方法不适用于MongoDB ID

Question

I was trying to use includes method to check existing MongoDB Id in an array but it is always returning false.

Is it a some kind of bug in the includes method or am I doing something wrong below is my code

  let user = req.user._id;
  let keyword= req.query.q;
  let userSearchHistory = await UserSearchHistory.findOne({searchKeywords: keyword}).exec();

  if (!userSearchHistory.users.includes(user))
  {

  }

where users in my database is an array with ObjectId refering to user collection

I also tried converting user object

   let user= mongoose.Types.ObjectId(req.user._id);

But still the same result. Converting ObjectIds to String working for me but then I have to remove the references in my model what is the proper way to handle this ?

Answer 1

This is probably happening because userSearchHistory.users returns an array of objectIds. You can try replacing userSearchHistory.users.includes(user) with userSearchHistory.users.map(user=>user.toString()).includes(user) .

This way you will be able to convert the array of objectIds to array of strings before applying 'includes' function.

Edit : Did you try trimming spaces in 'req.user._id' by using req.user._id.trim() and then casting it to objectId?