gistfile1.txt

chain: function() {
  collection.fetch()
  whenFetched(collection,function() {
    ...
    another_collection.fetch()
    whenFetched(another_collection,function() {
      ...
    });
  );
},
 
tree: function() {
  collection.fetch()
  whenFetched(collection,function() {
    subordinate_collection2.fetch()
    whenFetched(subordinate_collection2,function() {
      ...
    });
 
    subordinate_collection1.fetch()
    whenFetched(subordinate_collection1,function() {
      ...
    });
  };
},

whenFetched: function(collection, callback) {
  $.when(_.chain([collection]).flatten().pluck("_fetch").value()).done function(){
      callback();
  };
}