app/views/courses/_review_round.html.erb
<p>
registration: <%= @course.review_registration %>
</p>
<% if @course.review_registration=="open" %>
<%= form_tag("/tktl-labtool/courses/#{@course.id}", :method => :put) do %>
<%= hidden_field_tag 'course[state]', 0 %>
<%= submit_tag "close registration", :confirm => "Are you sure?" %>
<% end %>
<% else %>
<%= form_tag("/tktl-labtool/courses/#{@course.id}", :method => :put) do %>
<%= hidden_field_tag 'course[state]', 1 %>
<%= submit_tag "open registration", :confirm => "Are you sure?" %>
<% end %>
<% end %>
<p> round: <%= @course.review_round %></p>
<%= form_tag("/tktl-labtool/courses/#{@course.id}", :method => :put) do %>
<%= hidden_field_tag 'course[review_round]', @course.review_round+1 %>
<%= submit_tag button_label, :confirm => "Are you sure?" %>
<% end %>