<%= f.select :assigned_to_id, (@issue.assignable_users.collect {|m| [m.name, m.id]}), :include_blank => true %>
--- ><%= f.select :assigned_to_id, (@issue.assignable_users.collect {|m| [m.name, m.id]}.sort_by { |m| [m[0]] }), :include_blank => true %>