Knockout mapping and parent options

[Filipe Pinheiro]

I'm tring to map this 

    { items: [

        { id: 1 },

        { id: 2 },

        { id: 3 }

    ]};

 

when creating something in the array I add a function to remove the item from the collection.

    var mapping = {

        'items': {

            key: function(data) {

                return ko.utils.unwrapObservable(data.id);

            },

            create: function(options) {

                var o = (new(function() {

                    this._remove = function() {

                        options.parent.items.mappedRemove(options.data);

                    };

                    ko.mapping.fromJS(options.data, {}, this);

                })());

                return o;

            }

        }

    };

this method works if I am removing an item added using `items.mappedCreate` but don´t work with the items mapped on `ko.mapping.fromJS`.

When debugging I noticed that options.parent are not the same in the different situation.

Why? Should both methods return as parent the items observableArray?

I have set up a jsfiddle with an example http://jsfiddle.net/fampinheiro/9CcME/.

Thank you

[Roy Jacobs]

Hi Filipe,

It has been an outstanding issue for a while that the 'options.parent' property is not always consistent. In your fiddle it can be solved by calling "vm.items.mappedRemove" instead, but I realize that may not be possible in your actual app.

I will take a look at fixing this, though.

Roy

[Filipe Pinheiro]

I will try a workaround and follow close the developments.

Thank you.

[Roy Jacobs]

Hi Filipe,

I have just committed a fix to GitHub. It makes your jsfiddle example work without any changes. Let me know if you run into additional issues by adding an issue on GitHub.

With regards,

Roy