[
  { day_of_week: 'Thursday', time_of_day: '7 am' },
  { day_of_week: 'Thursday', time_of_day: '8 am' },
  { day_of_week: 'Thursday', time_of_day: '9 am' },
  { day_of_week: 'Friday', time_of_day: '7 am' },
  { day_of_week: 'Friday', time_of_day: '8 am' },
  { day_of_week: 'Friday', time_of_day: '9 am' },
  { day_of_week: 'Friday', time_of_day: '10 am' },
  { day_of_week: 'Saturday', time_of_day: '8 am' },
  { day_of_week: 'Saturday', time_of_day: '9 am' },
  { day_of_week: 'Saturday', time_of_day: '10 am' }
]

<%= simple_form_for(current_user, url: registration_path(:user)) do |f| %>
        <% @timeslots.each do |day, values| %>
          <div class="lead">
            <%= day %>
          </div>
          <%= f.simple_fields_for :timeslots, values.sort_by { |slot| slot[:time_of_day].to_i } do |ff, something| %>
            <div class="form-check">
              <label class="form-check-label">
                <%= ff.input_field :selected %>
                <%= ff.object.time_of_day %>
              </label>
            </div>
          <% end %>
        <% end %>
        <%= f.submit 'Update', class: 'btn btn-primary' %>
      <% end %>