How do I do custom model data parsing in backbone.js? - backbone.js

Question

While using backbone to hit an api, I've found that I need to only include some of the data in the response. The webserver is giving me back metadata in addition to data concerning my objects that I don't need.
The following solution works, but doesn't feel right. Is there a standard way of doing this?
var accountsCollection = new AccountsCollection();
accountsCollection.fetch({success : function(collection){
var results = new AccountsCollection();
collection.each(function(item){
results.add(new AccountModel({
id: item.toJSON().result[0].id,
messageText: item.toJSON().messageText,
address1: item.toJSON().result[0].address1,
address2: item.toJSON().result[0].address2
}));
});
onDataHandler(results);
}});
EDIT: This was my final solution based on the accepted answer:
parse: function(response) {
var accounts = [];
_.each(response['result'], function (account) {
accounts.push(account);
});
return accounts;
}

Answer 1

You could try overriding the Backbone.Collection.parse method and do some crazy underscore stuff. No idea if it fits your data..
var keysILike = ['foo', 'bar'];
AccountsCollection.extend({
parse: function(response) {
return _.compact(_.flatten(_.map(response, function (model) {
var tmp = {};
_.each(_.keys(model), function (key) {
if (_.contains(keysILike, key)) tmp[key] = model[key];
})
return tmp;
})));
}
});
With respect to #Sushanth's awesomeness you definitely want to use this solution:
var keysILike = ['foo', 'bar'];
AccountsCollection.extend({
parse: function(response) {
_.each(response, function (model) {
_.each(_.keys(model), function (key) {
if (!_.contains(keysILike, key)) delete model[key]
})
});
return response;
}
});