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var Foo = Backbone.Model.extend({
/* some code here */
});
//Default sollection
Foo.Collection = Backbone.Collection.extend({
model: Foo
/* some code here */
});
//# alt 1 - upfront, best when updates don't occur very often, and access occurs very often
Foo.Collection = Backbone.Collection.extend({
model: Foo,
initialize: function(initialModels, options) {
this.listenTo(this, 'add remove sync', this._regroup);
this._groupedData = [];
},
_regroup: function() {
//TODO parse collection and group by bar
},
getGroupedModels: function() {
return this._groupedData;
}
});
//# alt 2 - lazy, best when updates occur very often, and access occurs not as often
Foo.Collection = Backbone.Collection.extend({
model: Foo,
initialize: function(initialModels, options) {
this._groupedData = [];
},
_regroup: function() {
//TODO parse collection and group by bar
},
getGroupedModels: function() {
this._regroup();
return this._groupedData;
}
});
//# alt 3 - optimised, uses a flag to track whether updates have occurred
Foo.Collection = Backbone.Collection.extend({
model: Foo,
initialize: function(initialModels, options) {
this.listenTo(this, 'add remove sync', this._flagForRegroup);
this._groupedData = [];
this._needsRegroup = true;
},
_flagForRegroup: function() {
this._needsRegroup = true;
},
_regroup: function() {
this._needsRegroup = false;
//TODO parse collection and group by bar
},
getGroupedModels: function() {
if (this._needsRegroup) {
this._regroup();
}
return this._groupedData();
}
});
//# alt 4 - use a separate collection. useful when data needs to be a backbone collection instead of POJSO array
Foo.GroupedCollection = Backbone.Collection.extend({
initialize(models, options) {
this._origCollection = options.origCollection;
this.listenTo(this._origCollection, 'add remove sync', this._regroup);
},
_regroup: function() {
//parse this._origCollection and group by bar
}
});
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