<%= simple_form_for @user, method: :post, url: crop_image_user_path(@user), html: {remote: true, multipart: true, class: 'form-horizontal crop_image' } do |f| %>

<%= f.fields_for :profile_image do |p| %> <%= p.input :crop_x, as: :hidden, input_html: { class: :crop_x } %> <%= p.input :crop_y, as: :hidden, input_html: { class: :crop_y } %> <%= p.input :crop_w, as: :hidden, input_html: { class: :crop_w } %> <%= p.input :crop_h, as: :hidden, input_html: { class: :crop_h } %> <% end %> <%= f.submit 'Crop & Save', :class => [:btn, 'btn-primary'] %>

<% end %>