Deprecationwarning: custom inspection function on objects via .inspect() is deprecated

Question

Problem :

While I am trying to update the MongoDB document facing Deprecation Warning as below:

(node:71307) [DEP0079] DeprecationWarning: Custom inspection function on Objects via .inspect() is deprecated

 My Software Specs as below :

Node ver : v10.5.0,

db ver : v3.6.5,

Mongoose ver : mongoose@4.1.12

My MongoDB code for your reference as follows:

Myground.findById(mygroundId, function(err, mypground){

    if(err){

        console.log(err);

    } else {

        console.log(myground.celebrity);

        Celeb.create(celebData, function(err, celeb){

            if(err){

                console.log(err);

            } else {

                //save comment

                celeb.save();

                myground.celeb.push(celeb);

                myground.save();

                console.log(celeb);

                //req.flash('success', 'Created a comment!');

            }

        });

    }

});

Answer 1

I was also facing this deprecation warning and the unexpected behavior when I had accidentally used the Model.find() instead of Model.findOne()

So my incorrect code looked like below:

Us.find(que)

.then(us => {

  console.log(us.emailSettings.confirmToken)

})

Here with an ordinary object this would have failed with below error

TypeError: Cannot read property 'confirmToken' of undefined 

however with an mongo document object apparently it gives above deprecation warning.

Also to solve your problem you must use the useNewUrlParser and useCreateIndex. See the sample code snippet below :

mongoose.connect(

 config.databaseUrl,

 { 

    useNewUrlParser: true, 

    useCreateIndex: true 

 }

)

Or

mongoose.set("useCreateIndex", true);    

mongoose.connect(

    config.databaseUrl,

    { 

        useNewUrlParser: true

    }

  );

Finally you need to upgrade to the 5.2.10 and also set

mongoose.set('useCreateIndex', true);

And your issue will be resolved.