gistfile1.coffee

@PlanetExpress.module "Entities", (Entities, App, Backbone, Marionette, $, _) ->
  
	App.commands.setHandler "when:fetched", (entities, callback) ->
		xhrs = _.chain([entities]).flatten().pluck("_fetch").value()
	
		# if _.isArray(entities)
		# 	xhrs.push(entity._fetch) for entity in entities
		# else
		# 	xhrs.push(entities._fetch)
		
		$.when(xhrs...).done ->
			callback()

Brian… been implementing your loading view the past few days, the one from Backbone Rails. Regarding this method above, in particular… where is the "_fetch" key on the entities coming from? From what I can tell I don't see Backbone ever add that property to a model or collection. Am I missing something?

mikefowler, _fetch is "private" property of Backbone Model, therefore it isn't described in API documentation

When looking at the annotated source _fetch isn't located anywhere on the page.

It turns out that Brian has overridden the Backbone.sync method to add the _fetch property.

https://github.com/brian-mann/sc02-loading-views/blob/master/sc02-loading-views-after/app/assets/javascripts/backbone/config/backbone/sync.js.coffee

do (Backbone) ->
    _sync = Backbone.sync

    Backbone.sync = (method, entity, options = {}) ->

        sync = _sync(method, entity, options)
        if !entity._fetch and method is "read"
            entity._fetch = sync
        sync