Clever trick to automate children tagName based on their parent's element

gistfile1.coffee

class Views.CompositeView extends Marionette.CompositeView
    itemViewEventPrefix: "childview"

    itemViewOptions: (model, index) ->
      options = {}
      options.tagName = "tr" if @itemViewContainer is "tbody"
      options

class Views.CollectionView extends Marionette.CollectionView
    itemViewEventPrefix: "childview"

    itemViewOptions: (model, index) ->
      options = {}
      options.tagName = "li" if @tagName is "ul"
      options