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How to separate some response data from model on backbone.js callbacks
{ message: "Successful post", post: { id: 13, text: "test" } }

post = new Post({..})
post.save({}, {
  success: function(post, xhr) {
     data = jQuery.parseJSON(xhr.responseText)
     alert(data.message)
  }
})

{ message: "Successful post", id: 13, text: "test" }

parse : function(resp, xhr) {
  alert resp.message;
  return resp.post;
},