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class User
  :has_many :domains, :through => :coordinators
  def domains_responsible_for
    self.domains
  end
  
  def regions_responsible_for
    self.domains.regions # Not very fast code... but will work
  end
  
end


class Coordinators
  :belongs_to :user
  :belongs_to :domain
end


class Domain
  :has_many :users, :through => :coordinators
  :belongs_to :region
  def coordinators
    self.coordinators
  end
end

def Region
  :has_many :domains
  
  def coordinators
    self.domain.users
  end

end