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7049572
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2011-08-13T09:21:08.867
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2011-08-13T09:27:52.517
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2011-08-13T09:27:52.517
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6677815
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2
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text
Body
Backbone.js support for nested collection/models is non-existent, and they provide no saving support (see <a href="http://documentcloud.github.com/backbone/#FAQ-nested" rel="nofollow">http://documentcloud.github.com/backbone/#FAQ-nested</a>). You have to override toJSON on any model with a subcollection. I've run into this scenario a million times. If you have something like (in coffeescript): <pre><code>class MainModel extends Backbone.Model itemCollection: -> @_itemCollection ?= new ItemCollection(@get('itemCollection')) class ItemCollection extends Backbone.Collection model: ItemModel class ItemModel extends Backbone.Model subCollection: -> @_subCollection ?= new SubCollection(@get('subCollection')) class SubCollection extends Backbone.Collection model: SubModel class SubModel extends Backbone.Model mainModel = new MainModel(json) </code></pre> Then in order for mainModel.save() to work, you need to override toJSON on MainModel and ItemModel, like: <pre><code>class MainModel extends Backbone.Model itemCollection: -> @_itemCollection ?= new ItemCollection(@get('itemCollection')) toJSON: -> return _.extend(@attributes, {itemCollection: @itemCollection().toJSON()}) class ItemModel extends Backbone.Model subCollection: -> @_subCollection ?= new SubCollection(@get('subCollection')) toJSON: -> return _.extend(@attributes, {subCollection: @subCollection().toJSON()}) </code></pre> I wrote the example in coffeescript because it's much more concise than javascript. If you need any help making sense of it, please just ask. Hope this helps! --- Note --- Technically, in coffeescript, the toJSON methods could simply be: <pre><code>toJSON: -> _.extend @attributes, itemCollection: @itemCollection().toJSON() </code></pre> But I wrote it the way I did to be more understandable to non-coffeescripters.
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