Hello world MongoDB via Meteor + Aggregate

hello-mongodb.js

// ref : https://github.com/meteorhacks/meteor-aggregate
Meteor.startup(function () {

    // C : insert
    console.log("## insert");

    // insert list
    var list_id = Lists.insert({
        name: "foo",
        incompleteCount: 1,
        type: "dummy"
    });

    // insert 1 item
    Todos.insert({
        listId: list_id,
        text: "first",
        createdAt: new Date(),
        checked: true
    });

    // insert list
    list_id = Lists.insert({
        name: "bar",
        incompleteCount: 2,
        type: "dummy"
    });

    // insert 2 items
    Todos.insert({
        listId: list_id,
        text: "first",
        createdAt: new Date()
    });
    Todos.insert({
        listId: list_id,
        text: "second",
        createdAt: new Date()
    });

    // R : find *
    console.log("## find * ");
    Todos.find().forEach(function (todo) {
        console.log(todo.text);
    });

    // R : find where
    console.log("## find where ");
    Todos.find({"checked": true}).forEach(function (todo) {
        console.log(todo.text);
    });

    // R : find in
    console.log("## find in ");
    Todos.find({text: {$in: ["first"]}}).forEach(function (todo) {
        console.log(todo.text);
    });

    // R : find or
    console.log("## find or ");
    Todos.find({$or: [{text: 'first'}, {text: 'second'}]}).forEach(function (todo) {
        console.log(todo.text);
    });

    // R : find and
    console.log("## find and ");
    Todos.find({text: 'first', "checked": true}).forEach(function (todo) {
        console.log(todo.text);
    });

    // U : update
    Lists.update(list_id, {
        name: "bar!",
        incompleteCount: 1
    });

    // D : remove
    console.log("## remove ");
    // remove item
    Todos.remove(
        {text: {$in: ["first", "second"]}},
        function (err, results) {
            console.log("removed Todos : " + results);
        }
    );

    // remove list
    Lists.remove(
        {"type": "dummy"},
        function (err, results) {
            console.log("removed Lists : " + results);
        }
    );

    // aggregate
    console.log("## aggregate ");
    Todos.aggregate([
        {$match: {"checked": true}},
        {$group: {_id: "$listId", count: {$sum: 1}}}
    ]).forEach(function (todo) {
        console.log(todo);
    });
});