app/views/cracker_binaries/_form.html.erb
<%= simple_form_for(@cracker_binary) do |f| %>
<%= f.error_notification %>
<%= f.error_notification message: f.object.errors[:base].to_sentence if f.object.errors[:base].present? %>
<div class="form-inputs">
<%= f.input :version %>
<%= f.input :active %>
<%= f.association :cracker %>
</div>
<div class="form-actions">
<%= f.button :submit %>
</div>
<% end %>