Rails - Apr 2010 - Dynamic Meta data

What is the best way to have a table that defines what the thing is
and another table that defines if you hae it or not..  maybe a table
will describe what i want better!! :

           ----------------define the items in one table
          V
[X]  ITEM1
[_]  ITEM2
[_]  ITEM3
[X]  ITEM4
     ...
[_]  ITEMX

  ^------------------------Define if the user has it in another


Is this polymorphic?    please point me where to learn how to do this
the right way..

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This is a simple many-to-many relationship.

See here:
http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html

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