Perdón por el vago título, no estoy seguro de lo que está pasando lo suficiente como para formularlo mejor.

Por lo tanto, este es el render en mi opinión:

  render: function () {
    var that = this;
    var template = JST['gists/index'];
    that.$el.html(template);
    console.log(['index to render', that.collection]);
    _.each(that.collection, function (gist) { // <- I set a breakpoint here
      console.log('looping');
      that.appendGistDetail(gist);
    });

    return that;
  },

El `console.log (..., that.collection]) está registrando esta colección correctamente:

["index to render", child]
  0: "index to render"
  1: child
    _byId: Object
    length: 1
    models: Array[1] // <- Note one element. Saving space, but I checked it out and the model is correct
// Worth noting 'looping' is not being logged

Sin embargo, la salida de la variable Variable de alcance de punto de interrupción mencionada anteriormente en las herramientas Chrome Dev:

that: child
  $el: jQuery.fn.jQuery.init[1]
  childViews: Array[0]
  cid: "view2"
  collection: child
    _byId: Object
    length: 0
    models: Array[0] // <- Note it's empty, just to test I also set a bp on the line above and it's the same, and when I hovered my mouse over `that.collection` from `console.log` it also said it was empty, but it logs correctly.

Entonces, no estoy realmente seguro de qué hacer, o incluso de lo que está pasando.