<%= select_tag "month", options_for_select(@months, @sale_plan.month.strftime("%Y-%m")), class: 'required' %>

<%#= select_tag "teacher_id", options_for_select(@teachers, @sale_plan.teacher_id), class: 'required' %> <%= select_tag "teacher_id", options_for_select(@teachers), class: 'required' %>

<%= select_tag "finish_rate", options_for_select(@finish_rates, @sale_plan.finish_rate) %>