app/views/cdx/admin/shared/_nested_asset_fields.html.erb
<% if f.object.persisted? %>
<div class="nested-fields col-lg-2 col-md-3 col-sm-4 col-xs-6">
<div class="box box-success box-solid">
<div class="box-header with-border">
<h3 class="box-title">#<%= f.object.id %></h3>
<div class="box-tools pull-right">
<%= link_to_remove_association fa_icon(:times), f, class: 'btn btn-box-tool' %>
</div>
</div>
<div class="box-body text-center">
<% if f.object.image? %>
<%= image_tag f.object.attachment.url(:original) %>
<% else %>
<%# TODO: File icon + filename %>
<% end %>
</div>
</div>
</div>
<% else %>
<div class="nested-fields col-lg-2 col-md-3 col-sm-4 col-xs-6">
<div class="box box-warning box-solid">
<div class="box-header with-border">
<h3 class="box-title"><%= t('admin.actions.new') %></h3>
<div class="box-tools pull-right">
<%= link_to_remove_association fa_icon(:times), f, class: 'btn btn-box-tool' %>
</div>
</div>
<div class="box-body">
<%= render partial: 'cdx/admin/shared/file_input', locals: {f: f, multiple: 'multiple', style: 'warning', attachment: 'attachment' } %>
</div>
</div>
</div>
<% end %>