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var ReferenceCountedModel = Backbone.Model.extend({
take: function() {
if (!this._referenceCount) {
this._referenceCount = 1;
ReferenceCountedModel._ids[this.id] = this;
} else
++this._referenceCount;
},
put: function() {
if (!this._referenceCount)
throw "Double free in ReferenceCountedModel";
if (!--this._referenceCount)
delete ReferenceCountedModel._ids[this.id];
}
});
ReferenceCountedModel._ids = {};
var ReferenceCountingCollection = Backbone.Collection.extend({
_prepareModel: function(attrs, options) {
if (attrs instanceof Backbone.Model) {
if (!attrs.collection)
attrs.collection = this;
attrs.take();
return attrs;
}
options || (options = {});
options.collection = this;
var model = new this.model(attrs, options);
if (model.id in ReferenceCountedModel._ids)
model = ReferenceCountedModel._ids[model.id];
model.take();
if (!model._validate(attrs, options))
return false;
return model;
},
_removeReference: function(model) {
if (this === model.collection)
delete model.collection;
model.off('all', this._onModelEvent, this);
model.put();
}
});
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