gistfile1.txt

def self.multi_scope(scopes)
  my_scopes = Array.new
  scopes.each do |scope|
    m_scopes << self.send(scope) if self.respond_to? scope
  end
  if my_scopes.length == 0
     return slef.none
  else
     f = my_scopes.delete_at(0)
     my_scopes.each do |s|
       f = f.or(s)
     end
     return f
  end
end