Category Hierarchy

categories.js

apiRouter.route('/categories')
	.get(function (req, res) {
		Categories.find(function (err, categories) {
			if (err) res.send(err);
			// return categories
			res.json(categories);
		});
	})
	// create a category (accessed at POST http://localhost:8080/api/categories)
	.post(function (req, res) {
		Categories.findOne({'_id': req.body.parent}, 'ancestors', function (err, parents) {	
			// create a new instance of the categories model
			var categories = new Categories();
			categories.slug = req.body.slug;
			categories.name = req.body.name;
			if (req.body.parent == undefined) {
				categories.save(function (err) {
					if (err) {
					// duplicate entry
						if (err.code == 11000)
							return res.json({ success: false, message: 'A category with that name already exists.'});
						else
							return res.send(err);
					}
					res.json({ message: 'Category created!' });
				});
			} else {
				categories.parent = req.body.parent;
				if (parents.ancestors.length == 0) {
					categories.ancestors = req.body.parent;
					categories.save(function (err) {
						if (err) {
						// duplicate entry
							if (err.code == 11000)
								return res.json({ success: false, message: 'A category with that name already exists. '});
							else
								return res.send(err);
						}
						res.json({ message: 'Category created!' });
					});

				} else{
					
					parents.ancestors.push(req.body.parent);
					categories.ancestors = parents.ancestors;
					categories.save(function (err) {
						if (err) {
						// duplicate entry
							if (err.code == 11000)
								return res.json({ success: false, message: 'A category with that name already exists. '});
							else
								return res.send(err);
						}
						res.json({ message: 'Category created!' });
					});

				}

			};

		});		
	});