object-to-form-data.coffee

objToFormData = (obj, formData, prefix) ->
  formData ?= new FormData
  formKey = null

  angular.forEach obj, (val, key) ->
    if prefix?
      formKey = "#{prefix}[#{key}]"
    else
      formKey = key

    if typeof val is 'object' and val.constructor isnt File
      objToFormData(val, formData, formKey)
    else
      formData.append formKey, val

  formData