"Saving" changes to an object's variable(s) but not save changes to database.

I have what may be such a profoundly stupid question that it may need  
to be ignored by all. I've gone through my books and the list and  
Google searches and I still can't find anything that gets me even  
close to the answer (also usually a big tip off that my question/and  
or thinking is deeply misguided).

My problem is basically this: I want users of my web application to  
be able to make form input changes into the variable value of each  
instance of an object generated from an EOFetchspecification. And  
then I want to be able to save these values in the session so that I  
can move it between components, refer to it, and then have it  
disappear at the end of the session without ever bothering the  
database again. If I were to use the saveChanges method on the  
editingcontext for this NSMutableArray of objects and its input  
variables, everything works fine, but I don't want to save changes to  
the database, I want to save changes to the (temporary) values in the  
variable in the objects held in the session.

I have the WOTextFields just sitting there. All I want to do is link  
them up with some kind of action method that will record the user  
input into the object variables in the session WITHOUT saving those  
changes to the database. It seems so basic that I have to ask, what  
am I missing?