How can I model my MongoDB database to allow me to easily add in new products & user interactions?

Working with Data Node.js Frameworks
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I am looking for the best way to model this scenario:

There is a ProductA model. Users can “like” or “dislike” ProductA documents. The documents are then added to an array in the User model called “likes” & “dislikes.”

var UserSchema = new mongoose.Schema({
    ...,
    likes: [{ type: mongoose.Schema.Types.ObjectId, ref: 'ProductA' }],
    dislikes: [{ type: mongoose.Schema.Types.ObjectId, ref: 'ProductA' }],
    ...,
});

Now, I have realized that I want to add in a new Product: “ProductB.” How do I restructure this database to keep this scalable? I am not sure what the best way to do this would be in MongoDB.

I believe my ideal scenario is the following psuedo-model:

var InteractionSchema= new mongoose.Schema({
    product: // anonymous reference to an object
    productType: //enum of which product it is
    user: // user who made the interaction
    interactionType: // like or dislike enum
});

I could not find any reference to how to handle anonymous references in MongoDB however. I would appreciate some advice