Problems in lesson from angular-meteor.com - mongodb

Question

I start to learn angular2 and meteor, from http://angular-meteor.com/tutorials/angular2/3-way-data-binding
And in 3th lesson i have 2 error in console:
refreshingclient/app.ts (18, 11): Generic type 'Array<T>' requires 1 type argument(s).
client/app.ts (20, 19): Cannot find name 'zone'.
when i added some documents to Mongo from command line, they not appear on page.
and my app.ts file:
/// <reference path="../typings/angular2-meteor.d.ts" />
import {Component, View, NgFor} from 'angular2/angular2';
import {Parties} from 'collections/parties';
import {bootstrap} from 'angular2-meteor';
#Component({
selector: 'app'
})
#View({
templateUrl: 'client/app.html',
directives: [NgFor]
})
class Socially {
parties: Array;
constructor() {
Tracker.autorun(zone.bind(() => {
this.parties = Parties.find().fetch();
}));
}
}
bootstrap(Socially);
what is the problem?

Answer 1

In the client/app.ts file, the instructions (http://angular-meteor.com/tutorials/angular2/3-way-data-binding) show:
class Socially {
parties: Mongo.Cursor;
constructor () {
this.parties = Parties.find();
}
}
It should actually be:
class Socially {
parties: Mongo.Cursor<Object>;
constructor () {
this.parties = Parties.find();
}
}
Notice <Object> has been added after Mongo.Cursor.
If you go to Step 4, there is a link to download a zip file of the code (https://github.com/Urigo/meteor-angular2.0-socially/archive/step_03.zip). You'll see in there that the code is correct.

Answer 2

kuka-
main.ts and load_parties.ts are there just to create data in your db if there is none. So if adding those files made it work, there must have been something wrong with the data you created from the command line. My guess is the data you added from the command line went to the wrong collection (i.e. Party vs party). You can check your collections and data by typing
meteor mongo
at the root of your project to get a mongo prompt. Then at the mongo prompt type
show collections
This will display all collections in your db. You should have one called 'parties'. Type the following to see the content.
db.parties.find().pretty()
Study the data to make sure all property names are identical. If you created a property call 'partyName' and your form is looking for 'name', nothing will show up.