title: How to create a JayData model entity with a Knockout ko.computed property?
body: <p>Using this simple example model:</p>
  
  <pre><code>function Person(){
      var self = this;
      self.firstName = ko.observable();
      self.lastName = ko.observable();
      self.fullName = ko.computed(function(){
          return self.firstName() + ' ' + self.lastName();
      }); 
  }
  </code></pre>
  
  <p>How would you implement FullName with JayData?</p>
  
  <pre><code>$data.Entity.extend("Person", {
      FirstName: { type: String },
      LastName: { type: String },
      FullName: ???
  });
  </code></pre>