<%= edit_form_for(dmail) do |f| %> <%= f.input :to_name, :label => "To", :input_html => { value: dmail.to.try(:name), data: { autocomplete: "user" } } %> <%= f.input :title, :as => :string %> <%= dtext_field "dmail", "body" %> <%= f.button :submit, "Send", :data => { :disable_with => "Sending..." } %> <%= dtext_preview_button "dmail", "body" %> <% end %>