Mongoose "this.model is not a function"

This is how I defined my Schema & Schema methods.

 const Schema = mongoose.Schema; const ItemSchema = new Schema({ type:String, brand:String, description:String, model:String, price:Number, createdAt:{type: Date, default: Date.now}, updatedAt:{type: Date, default: Date.now} }); ItemSchema.statics.findBrand = function(brand, callback){ // this == item return this.find({brand: brand}, callback); } ItemSchema.statics.findType = function(type, callback){ return this.find({type: type}, callback); } ItemSchema.methods.findSameBrand = function(cb){ return this.model("Item").find({brand: this.brand}, cb); } var Item = mongoose.model("Item", ItemSchema); 

adding items to the database and using the methods.

Item.remove({}, function(err) { if (err) console.error(err); Item.create(itemData, function(err, items) { if(err) console.error(err); Item.findOne( {type: "Mouse"}, function(err, mouse){ console.log(mouse); mouse.findSameBrand( (err, items) => { if (err) console.error(err); //any code db.close( () => { console.log("connection closed"); }); }); }); }); 

The console.log(mouse) prints the first mouse document it found

{ _id: 598907ecbf5ac40b24346028, type: 'Mouse', brand: 'Corsair', description: '2', model: 'G104', price: 8000, } 

Yet I am getting an error that this.models is not a function.

this.model is not a function.
at model.ItemSchema.methods.brandFind >(/Users/sean/ApplicationsDevelopment/sandbox.js:39:21)