<%= form_for post, html: ajax_form_hash('#posts_container', insert_method: 'prepend', sub_class: "AddALineForm", container: '#new_post') do |f| %> <%= f.label :title %> <%= f.text_field :title %> <%= f.hidden_field :post_type_id %> <%= f.submit %> <%= link_to('Cancel', '#', :class => 'button', data: { emptier: true, target: '#new_post' } ) %> <% end %>