<%= f.inputs do %> <%= f.input :title %> <%= f.input :description, input_html: {rows: '2', class: 'col-md-8'}%> <%= f.input :vdays, collection: @conference.vdays.map {|x| [x.day, x.id]}, label: 'Position is required for the following days:'%> <%= remove_association_link :vposition, f %> <% end %>