`@bookmark.name` is already a string, and you're interpolating it into a string that has no other content, so you could just replace that with `@bookmark.name` itself. Also, this is not the correct usage of `placeholder` -- it's used to provide grayed-out text that should be displayed only when the form field is empty (usually instead of an explicit label). The actual value of the form field will be filled with the existing values from the model when you use `form_for`.