<%= bootstrap_form_for(@user) do |f| %> <%= render 'shared/error_messages', object: f.object %> <%= image_tag @user.picture.url if @user.picture? %> <%= f.file_field :picture, accept: 'image/jpeg,image/gif,image/png' %> <%= f.submit "Save picture", class: "btn btn-primary" %> <% end %>