.nested-fields
  .well.well-sm
    = link_to_remove_association f, class: "btn-dts-remove pull-right" do
      %span.glyphicon.glyphicon-remove
    .form-group
      = f.hidden_field :uri_cache
      = f.label :title
      = f.text_field :title, class: 'form-control'
    - if f.object.uri?
      %a{ href: f.object.uri }
        #{f.object.uri.file.filename}
    - else
      .form-group
        = f.label :uri
        = f.file_field :uri