scope and :select causing duplicate WHERE clause

class Address < ActiveRecord:Base

  def Address.emails
    scoped(:select => "addresses.email").map(&:email)
  end
end


# This has a duplicated WHERE clause:

>> Address.scoped(:conditions => "1 = 1").emails
Address Load (0.0ms)  SELECT addresses.email FROM `addresses` WHERE ((1 = 1) AND (1 = 1))

# However spelling out the function by hand works:

>> Address.scoped(:conditions => "1 = 1").scoped(:select => "addresses.email").map(&:email)
Address Load (1.0ms)  SELECT addresses.email FROM `addresses` WHERE (1 = 1)