Mongoose findOne() returns an empty object

Question

I am finding one single document using findOne() My document has userid as one of the key inside my users model.

Example

{
   userid: 1,
   name: 'John'
}

Now I am able to receive this document as object when I do the following

users.findOne({userid: 1}, function(e, data){
   if(e){
      return (res.send('Failed'))
   }else{
      return (res.send(data))
   }
});

However, if I try to submit the same value of userid dynamically then the data obj returns null and still if(e) statement is not executed.

Example

users.findOne({userid: req.body.userid}, function(e, data){
   if(e){
      return (res.send('Failed'))
   }else{
      return (res.send(data))
   }
});

I console logged the value of req.body.userid and checked that it is 1 when I pass it dynamically.

What am I doing wrong? Is the value of req.body.userid not passed correctly to userid key?

Answer 1

If you are trying to pass filter values using variables you need to set it correctly using a filter object

Check the code below

var key = "userId"; //example
var value = req.body.userId;
var filter = {};
filter[key] = value;

    user.model.findOne(filter, function(e, data){
       if(e){
          return (res.send('Failed'))
       }else{
          return (res.send(data))
       }
    });