CODEWITHSUNDEEP
backbone.js
budhavarapu ranga
budhavarapu ranga

Reputation: 483

Backbone save does not send undefined attributes

I have the following code : 

     this.myModel.save(this.patchAttributes, {
        //Ignored if saving new record; will send a POST
        patch: true,
        success: function() {
               success();
            }
        },
        error: function() {
                error();
        }
    });

If my patchAttributes has an entry like fieldName:undefined, I cannot see it in the request headers of the PATCH request.

Upvotes: 3

Views: 267

Answers (2)

Tan Nguyen
Tan Nguyen

Reputation: 3354

It is the correct behaviour, take a look at Backbone source code (https://github.com/jashkenas/backbone/blob/master/backbone.js#L1357). And btw, I don't think it is stated explicitly in any of Backbone documentations. It is more like common knowledge when dealing with JSON

If you want to keep those "undefined" variables, you need to set them to, say, null by using defaults http://backbonejs.org/#Model-defaults

Upvotes: 0

idbehold
idbehold

Reputation: 17168

That's because Backbone is JSON.stringifying the data before sending it. The JSON spec does not allow the undefined token. Therefore any properties that are undefined will be omitted from the JSON string.

JSON.stringify({ foo: undefined });
// The output is "{}"

Instead of undefined you should use null which is part of the JSON spec:

JSON.stringify({ foo: null });
// The output is "{"foo":null}"

Upvotes: 3

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