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backbone.js - How do I trigger the success callback on a model.save()?

this.model.save({
  success: function(model, response){
    console.log('success');
  },
  error: function(){
    console.log('error');
  }
})

The model is correctly posted to the server which handles the save, but the success callback is not fired. Do I need to send something back from the server ?

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The first argument of save is the attributes to save on the model:

this.model.save( {att1 : "value"}, {success :handler1, error: handler2});

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