A feature that know lives only in my mind not in my company production

Observer object

function update_total(data) {
	data.total = data.value * data.quantity    
}

var registryProxy

// Go through each of our data properties
registry_observer = function(data) {
  track_keys = ['value', 'quantity']
  track_keys.forEach(function(key) {
    var internalValue = data[key]
    Object.defineProperty(data, key, {
      get: function() {
        return internalValue
      },
      set: function(new_val) {
        if (track_keys.includes(key)) {
          var treated_value = StantFormat.convertCurrencyToFloat(new_val)
          internalValue = treated_value
          update_total(data)
          if (this.debug) {
            console.log('set triggered with', new_val)
          }
        }
      }
    })
  })
}

Rip ConfigurePreplanningToCalculateTotal

class @ConfigurePreplanningToCalculateTotal
  @reset_plannings_resume: ->
    window.preplannings_data_resume = []

  @remove_element_from_preplanning_data_resume: (removed_element) ->
    window.preplannings_data_resume = window.preplannings_data_resume.filter (el) ->
      return false if el == removed_element
      return true
    $('.js-preplanning-value').trigger('change')
  
  @init: (service, preplanning_section_html) ->
    treated_html = set_preplanning_resume_data(service, preplanning_section_html)
    
    handle_quantity_and_value_change_and_update_total_general()
    
    return treated_html
  
  set_preplanning_resume_data = (service, preplanning_section_html) ->
    preplanning_section_html = parse_html_to_dom_object(preplanning_section_html)
    value = StantFormat.convertCurrencyToFloat(service.value) || 0
    quantity = StantFormat.convertCurrencyToFloat(service.quantity) || 0

    preplanning_data = {
      value: value,
      quantity: quantity,
      total: value * quantity,
      debug: false
    }

    registry_observer(preplanning_data)
    window.preplannings_data_resume.push(preplanning_data)
    preplanning_section_html[0].preplanning_data = preplanning_data
    
    return preplanning_section_html

  parse_html_to_dom_object = (html) ->
    return $.parseHTML(html)

  handle_quantity_and_value_change_and_update_total_general = ->
    $('.js-services-form').on 'change', ['.js-preplanning-value js-preplanning-quantity'], (e) ->
      input = e.target
      preplannig_data = $(input).parents('.js-services-preplanning-row').get(0).preplanning_data
      sum = 0
      
      if input.classList.contains('js-preplanning-value')
        preplannig_data.value = input.value
      else
        preplannig_data.quantity = input.value

      for current_input_element in window.preplannings_data_resume
        sum += current_input_element.total

      sum = sum.toFixed(2)
      $('#js-text-planning').val(StantFormat.converteFloatMoeda(sum))