app/views/search/_pagination.html.erb
<%= form_for(search_options, method: :get) do |f| %>
<% search_options.purposes.each do |purpose_uuid| %>
<%= f.fields_for :purposes do |purpose_form|%>
<%= purpose_form.hidden_field nil, value: purpose_uuid %>
<% end %>
<% end %>
<%= f.hidden_field :show_my_plates_only, class: 'custom-control-input' %>
<%= f.hidden_field :include_used, class: 'custom-control-input' %>
<% search_options.each_page do |page, selected| %>
<%= f.submit page, name: 'page', class: "btn btn-#{selected ? 'secondary' : 'default'}" %>
<% end %>
<% end %>