Immutable Backbone

This is a helper to make Backbone models and collections easier to use with React without having to rewrite your code. It does not make the Backbone models/collections themselves immutable; however it does make a model's attributes and a collection's models immutable - that is that after using model.set('key', value) the model.attributes object will not be the same reference.

An example

var assert = require('assert');
var Backbone = require('backbone');
require('immutable-backbone').infect(Backbone);
 
var MyModel = Backbone.Model.extend({});
var MyCollection = Backbone.Collection.extend({
  model: MyModel
});
 
var collection = new MyCollection();
var oldModels = collection.models;
var model = collection.add({id: 1, name: 'Foo'});
assert(oldModels != collection.models);
 
var oldAttributes = model.attributes;
oldModels = collection.models;
model.set('name', 'Bar');
assert(oldAttributes != model.attributes);
assert(oldModels != collection.models);

Models

Makes the attributes property immutable - that is any time that a property is changed within attributes, the attributes object itself is replaced such that oldAttributes != newAttributes.

Collections

Makes the models property immutable - that is any time that a model is added, removed, or just changed, the 'models' array itself is replaced such that oldModels != newModels.

Expectations

This library assumes that your code is well behaved - that is:

• you don't manipulate models / attributes directly, instead using the helper methods (get / set / etc)
• if attributes contains objects you immutably change those yourself i.e. newO = _.extend({}, m.get('o'), {foo: bar}); m.set('o', newO);

PureRenderMixin

This library contains a PureRenderMixin variant that understands immutable collections/models (the regular mixin will not work since the model itself is not immutable). However, this mixin is currently untested (and not yet used) so no guarantees are made about it!

License: MIT

Copyright © 2015 Timecounts Inc

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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

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