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Assuming you are referring to Rails specifically, not just Ruby. As an aside, get the book Agile Web Development with Rails. (Use the Google).

ActiveRecord’s finders either return an array:

@users = User.find(:all, :conditions => [‘name = ?’, ‘scott’])

or one object

@user = User.find
(1) # gets the user with an ID of one.

to iterate, you can use .each:

@users.each do |user|