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dynamic key in JSON file (used by backbone.js models for example…)

I am trying to create a backbone.js model with dynamic keys but can't seem to get it done right. Here's my model: window.MyModel = Backbone.Model.extend({ myDynamicVar : "country", urlRoot: "api/myModel", defaults: { "id": null, this.myDynamicVar : "USA", "country": { "route":"test/test/test", "class":".usa2", "txt":"USA 2" }, "region": "California", "year": "", "description": "", "picture": "" } }); Here I am trying to have myDynamicVar replaced by its content in my model. Any thought how I could get this done? Thanks in advance, Jimmy