I have a set of 7 dropdown inputs allowing admins to say whether they are open or closed for business on a given day. I'd like that changed to 7 open/closed switches (presumably styled checkboxes?) but can't figure out how to do this!

Here are the relevant bits of code I currently have (prior to any change):

app/view/backend/inventory_pool/edit.html.haml

- content_for :title, @inventory_pool
  = form_for [:backend, @inventory_pool], html: {name: "form"} do |f|

    .content
      - if is_admin?
        %a.button{:href => root_path}= _("Cancel")
      %button.button{:type => :submit}= _("Save %s") % _("Inventory Pool")

      %section
        %h2= _("Basic Information")
        .inner
          .field.text
            .key
              %h3= "#{_("Print Contracts")}"
              %p.description
            .value
              .input
                %input{type: "checkbox", name: "inventory_pool[print_contracts]", checked: @inventory_pool.print_contracts}


      %section#workdays
        %h2= _("Workdays")
        .inner
          - [1,2,3,4,5,6,0].each do |i|
            .field.text
              .key
                %h3= "#{I18n.t('date.day_names')[i]}"
              .value
                .input
                  %select{:name => "store[workday_attributes][workdays][]"}
                    %option{:label => _("Open"), :value => Workday::WORKDAYS[i]}= _("Open")
                    %option{:label => _("Closed"), :value => "", :selected => @store.workday.closed_days.include?(i) ? true : nil}= _("Closed")

app/models/workday.rb

class Workday < ActiveRecord::Base

  belongs_to :inventory_pool

  WORKDAYS = ["sunday", "monday", "tuesday", "wednesday", "thursday", "friday", "saturday"]

  def is_open_on?(date)

    return false if date.nil?

    case date.wday
    when 1 return monday
    when 2 return tuesday
    when 3 return wednesday
    when 4 return thursday
    when 5 return friday
    when 6 return saturday
    when 0 return sunday
    else
      return false #Should not be reached
    end
  end

  def closed_days
    days = []
    days << 0 unless sunday
    days << 1 unless monday
    days << 2 unless tuesday
    days << 3 unless wednesday
    days << 4 unless thursday
    days << 5 unless friday
    days << 6 unless saturday
    days
  end

  def workdays=(wdays)
    WORKDAYS.each {|workday| write_attribute(workday, wdays.include?(workday) ? true : false)}
  end
end

And in app/controllers/backend/inventory_pools_controller I have this (abridged):

  def update
    @inventory_pool ||= InventoryPool.find(params[:id])
    process_params params[:inventory_pool]
  end

  def process_params ip
    ip[:print_contracts] ||= "false" # unchecked checkboxes are *not* being sent
    ip[:workday_attributes][:workdays].delete "" if ip[:workday_attributes]
  end