What is the least lousy way to force Backbone.sync updates to use POST instead of PUT?

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Some of my Backbone models should always use POST, instead of POST for create and PUT for update. The server I persist these models to is capable of supporting all other verbs, so using Backbone.emulateHTTP is not a perfect solution either.

Currently I override the isNew method for these models and have it return true, but this is not ideal.

Other than modifying the backbone.js code directly, is there a simple way to achieve this goal on a model-by-model basis? Some of my models can use PUT (they are persisted to a different server that supports all verbs, including PUT), so replacing Backbone.sync with one that converts the 'update' method to 'create' is not ideal either.


add a sync(method, model, [options]) directly to your models you need to override.

YourModel = Backbone.Model.extend({
  sync: function(method, model, options) {
    //perform the ajax call stuff
  }
}

Here's some more information: http://documentcloud.github.com/backbone/#Sync