DataMapper fake property that's not stored in the DB

Question

Is it possible to set up something you could call a "fake property" in a DataMapper model? What I mean is, a property that isn't persisted, but that is still modifiable using create() or update(). Instead of persisting the data in the data store, a function would be called instead with the value.

Answer 1

Turns out that create() and update() do nothing more than self.property = value.

Answer 2

Use attr_accessor in your model like this:

class Account
  include DataMapper::Resource
  attr_accessor :password
end

The method is explained here what is attr_accessor in datamapper - ruby