app/views/pictures/_uploader.html.erb
<section class="pictures edit">
<p class="field file" >
<input type="file" class="file-field" name="picture[image]"
data-components="pictureUploader"
data-pictureuploader-options='<%= {url: url_for([:picture_upload, object]) }.to_json %>' />
</p>
<%= render 'pictures/thumbs_list', object: object %>
</section>