Updating Javascript object value gives null

Question

I'm trying to add a 'views' number on my page by incrementing the value every time someone visits the page.

I have a object like this:

{
    _id: "55da051afe08e73168fc7aeb",
    url: "https://www.youtube.com/watch?v=eUdM9vrCbow",
    title: "Django Unchained",
    embedUrl: "https://www.youtube.com/embed/eUdM9vrCbow",
    __v: 0,
    downvotes: 0,
    upvotes: 0,
    views: 0,
    created_on: "2015-08-24T13:37:33.951Z",
    desc: "With the help of his mentor, a slave-turned-bounty hunter sets out to rescue his wife from a brutal Mississippi plantation owner."
}

I'm retrieving this object via AngularJS's '.one()' method:

var movie = Movie.one($routeParams.id);

The goal is to increment this value. At the moment I'm doing it like this:

movie.views++;
movie.put();

But that doesn't work and just gives me a null value, while this does work:

movie.views = 10;
movie.put();

What am I doing wrong?

Is it possible that you're not actually retrieving anything in the movie object? That would explain why direct assignment of a number works, but incrementing (a null) doesn't. — Marc
– Marc, Commented Aug 24, 2015 at 14:04
Try incrementing other variables of your movie, if that doesnt work too, movie doesnt get loaded so everything is undefined and incrementing doesnt work but setting it to 10 does. — Tom Doodler
– Tom Doodler, Commented Aug 24, 2015 at 14:05
Wait, that's an object from some database, not a plain JS one, right? Which DB (wrapper) are you using? — Bergi
– Bergi, Commented Aug 24, 2015 at 14:07

Mike Vranckx · Accepted Answer · 2015-08-24 14:00:56Z

1

You can't increment a null value, set it 0 (zero) by default.

{
    _id: "55da051afe08e73168fc7aeb",
    url: "https://www.youtube.com/watch?v=eUdM9vrCbow",
    title: "Django Unchained",
    embedUrl: "https://www.youtube.com/embed/eUdM9vrCbow",
    __v: 0,
    downvotes: 0,
    upvotes: 0,
    views: 0, //instead of 'null'
    created_on: "2015-08-24T13:37:33.951Z",
    desc: "With the help of his mentor, a slave-turned-bounty hunter sets out to rescue his wife from a brutal Mississippi plantation owner."
}

answered Aug 24, 2015 at 14:00

Mike Vranckx

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3 Comments

Roemerdt Over a year ago

Sorry, that was a mistake in the question. I actually set is to 0. I updated the question.

Mike Vranckx Over a year ago

Oh ... when doing a console.log(movie) what do you have as result and what is the views value?

Roemerdt Over a year ago

{ "_id": "55da04e2fe08e73168fc7aea", "route": "movie", "reqParams": null, "restangularized": true, "fromServer": false, "parentResource": null, "restangularCollection": false }

Community · Accepted Answer · 2017-05-23 11:43:55Z

0

I fixed it like this:

I wasn't actually updating the actual object like Marc suggested

Movie.one($routeParams.id).get().then(function(response){
    response.views++;
    $http.put("http://localhost:3000/movie/" + $routeParams.id, response);
});

edited May 23, 2017 at 11:43

CommunityBot

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answered Aug 24, 2015 at 14:58

Roemerdt

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