<%= form_with url: start_activity_path, method: :post do |f| %> <%= f.select :id, @spell_activities.map { |a| [a.name, a.id] }, {}, { data: { activity_select_target: "select", action: "activity-select#load" } } %> <%= f.number_field :actions, value: 1, size: 5, min: 1, max: 2_000_000_000 %> <%= f.submit "Cast" %> <% end %>