How would one do async JavaScript getters and setters?

Question

Think of how Rails, e.g. allows you to define a property as associated with another:

class Customer < ActiveRecord::Base
  has_many :orders
end
         


        

Answer 1

Here's how you could implement your get orders function

function get(name) {
    return new Promise(function(resolve, reject) {
        db.find("orders", {customer: name}, function(err, data) {
             if (err) reject(err);
             else resolve(data);
        });
    });
}

You could call this function like

customer.get("John").then(data => {
    // Process data here...
}).catch(err => {
    // Process error here...
});