app/views/zadok/form/fields/_file_field.html.slim
.form-group
.custom-file
= form.file_field(attr, options.fetch(:html, {}).merge(class: "custom-file-input"))
= form.label(attr, class: "custom-file-label")
- if options[:preview] && resource.send(attr).try(:image?)
= image_tag(resource.send(attr), class: "logo img-fluid")