Railsのフォームでセレクタを使う

form_forを使うとき

<%= f.select :phone_type, options_for_select([["Select One", ""], "Cell", "Work", "Office", "Home", "Other"]), :class => 'genForm_dropBox' %>

http://stackoverflow.com/questions/5200213/rails-3-f-select-options-for-select

form_tagを使うとき

<%= select_tag(:city_id, '<option value="1">Lisbon</option>...') %>

http://guides.rubyonrails.org/form_helpers.html