ModelMapper.updateField() from MOAT js API Document

ModelMapper.updateFields.example.js

// Get the UID
var uid = ....;

// Prepares an update operation.
var myArrayTypeMapper =
  session.newModelMapperStub('MyArrayType');

// Creates or retrieves a model object
var obj = ...;
obj.myProperty = 'myValue';
obj.myIntProperty = 12345;
obj.myBooleanProperty = true;

// Enqueues the update operation
myArrayTypeMapper.updateFields(obj,
  // Specifies 2 of 3 props to be updated
  ['myProperty', 'myIntProperty'], {
  error : function(type, code) {
    if (type == 'NOT_FOUND') {
      // Create new!
      myArrayTypeMapper.add(obj);
    }
  }
});