Add viewmodel boilerplate

model.js

@@ -0,0 +1,40 @@
+var
+data = getGraphData(),
+nodes = data.nodes,
+links = data.links;
+
+$.each(nodes, function(index, node) {
+	node.index = index;
+});
+
+function getNodeById(id) {
+	return _.find(nodes, { id : id });
+}
+
+function getNodeByIndex(index) {
+	return nodes[index];
+}
+
+function getDependents(node, links) {
+	return $.map(_.where(links, { target: node.index }), function(item){
+		return getNodeByIndex(item.source);
+
+	});
+}
+
+var modules = $.map(nodes, function(node){
+	return {
+		'id': node.id,
+		'dependentCount': getDependents(node,links).length,
+		'dependents': getDependents(node,links),
+		'isOpen': ko.observable(false)
+	};
+});
+
+modules = _.sortBy(modules, 'dependentCount').reverse();
+
+var vm = {};
+
+vm.modules = ko.observableArray(modules);
+
+ko.applyBindings(vm);