CODEWITHSUNDEEP
backbone.jsdeep-copybackbone.js-collections
ali asad
ali asad

Reputation: 1349

How can I copy a model from one collection to another in Backbone.js

I am trying to copy a model from a backbone collection to another but problem is that only reference is being copies, that is if I change value of model in one collection the value is automatically changed for other collection. The problem is how do I make an exact copy of model object.

Thanks

Upvotes: 1

Views: 2795

Answers (4)

anandharshan
anandharshan

Reputation: 6342

This is how I create a deep copy of the model

var newModel = new createModel(JSON.parse(JSON.stringify(oldModel)));
newCollection.add(newModel );

Upvotes: 0

ali asad
ali asad

Reputation: 1349

There also exist a method clone in Backbone Model that creates a new copy with same attributes

this.widgetsActiveCollection.add(widget.clone());

Upvotes: 0

ali asad
ali asad

Reputation: 1349

I have tried all the methods of cloning but the result was not good because cid of the clonned model was becoming same which was causing problem. So I have applied this method

var widget = this.widgetsCollection.get(widgetId)
var newWidget=new Widget(widget.attributes);

This gives a copy with different cid.

enter image description here

Upvotes: 1

David Sulc
David Sulc

Reputation: 25994

Try creating a deep copy, which will create a new object instance with the same values.

An example can be found in this SO thread: What is the most efficient way to deep clone an object in JavaScript?

Upvotes: 0

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