What is attr_accessor in datamapper - ruby?

Yes, you are right. It is an attribute (a field) of your model, but not in your database. You could use such attributes to keep data that shouldn't be saved in the database, but that somehow are useful for other objects in your application.

It looks like the password is not stored in the database, which is good.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.