gistfile1.coffee

    jQuery ($) ->
      # Options for deeper nested fields
      resourcesOptions = {
        itemSelector: ".resource",
        containerSelector: ".resources-container",
        addSelector: ".resource-add",
        removeSelector: ".resource-remove",
        itemTemplateSelector: ".resource.template", # Identifies which template to use
        new_item_index: "new_resource_index" # Same used on view options
      }

      # Apply nestedFields to the outsider nested fields (first nested fields level)
      $(".project-form").nestedFields({
        itemSelector: ".task",
        containerSelector: ".tasks-container",
        addSelector: ".task-add",
        removeSelector: ".task-remove",
        itemTemplateSelector: ".task.template",
        new_item_index: "new_task_index",
        afterInsert: (item) ->
          # Applies nestedFields to this task's resources (deeper field)
          item.find(".nested-level-2").nestedFields(resourcesOptions)
          # Inserts a resource item (of the deeper field)
          item.find(".nested-level-2").nestedFields("insert")
      })

      # Applies nestedFields to all projects on page (to the second nested fields level)
      $(".project-form").find(".nested-level-2").nestedFields(resourcesOptions)