Single.fromPublisher subscribe and map to the return type reactivex java

Question

Using reactivex to map and return the value from the method as below

public Single<ProductViewModel> Create(ProductViewModel model) {
        Product product = new Product();
        product.setName(model.getName());
        product.setDescription(model.getDescription());
        product.setPrice(model.getPrice());

        return Single.fromPublisher(this.repository.getCollection("product", Product.class)
        .insertOne(product)).map(success -> {
             return new ProductViewModel(
                    success.getInsertedId(),
                    product.getName(),
                    product.getDescription(),
                    product.getPrice());
        });
    }

When I use the .map function the record is not inserted into the database, however, on the .subscribe method, the record is inserted successfully into the database.

But I want to map the inserted record and return the value to the consumer method.