app/views/admin/merchandise/prototypes/_form.html.erb
<fieldset>
<label>Name</label>
<%= form.text_field :name %>
<label>Active</label>
<%= form.check_box :active %>
</fieldset>
<fieldset>
<legend>Properties</legend>
<div id="prototype_properties">
<%= render partial: "property_form", locals: { form: form } %>
</div>
</fieldset>