Rails - Jul 2011 - how to create dropdown from a hash in rails 3

In rails 3, how to create a Dropdown from hash

I have following code in my User class

class User
  ...   other codes
  key :gender, Integer    # i use mongo db

  class << self
    def genders()            # not sure how to define static value, so do in
this way
      genders = {
        ''1'' => ''Male'',
        ''2'' => ''Female'',
        ''3'' => ''Secret''
      }
    end
  end

end

 In the user form, i am trying to create a gender dropdown list
<%= f.collection_select nil, :gender, User.genders, :key, :value %>

 but it complain 
undefined method `merge'' for :value:Symbol

 So what is the proper way to create the dropdown?

Thanks

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