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Editorial Team
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Asked: 2026-06-10T19:58:14+00:00

The following simple code throws an error: Uncaught TypeError: Cannot use ‘in’ operator to

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The following simple code throws an error:

“Uncaught TypeError: Cannot use ‘in’ operator to search for ‘id’ in
Leo” in backbone-min.js:9

http://jsfiddle.net/nW7KF/

<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script>
<script src="http://ajax.cdnjs.com/ajax/libs/underscore.js/1.1.4/underscore-min.js"></script>
<script src="http://ajax.cdnjs.com/ajax/libs/backbone.js/0.3.3/backbone-min.js"></script>
<script>
var User = Backbone.Model.extend({
    initialize: function(n) {
        this.name = n;
    }
});

var user = new User("Leo");
</script>
</body>
</html>​

How can I make this code work with Backbone.js?

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1 Answer

  1. Editorial Team

    You are not constructing the model correctly. From backbone.js’ documentation:

    When creating an instance of a model, you can pass in the initial values of the attributes, which will be set on the model. If you define an initialize function, it will be invoked when the model is created.

    new Book({
  title: "One Thousand and One Nights",
  author: "Scheherazade"
});

    So you would construct your model like this: http://jsfiddle.net/nW7KF/2/

    <script>
    var User = Backbone.Model.extend({});
    var leo = new User({ name: "Leo" });
    console.log(leo.get("name"));
</script>
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