pairs

pick

omit

isValidmodel.isValid() Run validate to check the model state. var Chapter = Backbone.Model.extend({ validate: function(attrs, options) { if (attrs.end < attrs.start) { return "can't end before it starts"; } } }); var one = new Chapter({ title : "Chapter One: The Beginning" }); one.set({ start: 15, end: 10 }); if (!one.isValid()) { alert(one.get("title") + " " + one.validationError); }

keys

isEmpty

invert

idAttributemodel.idAttribute A model's unique identifier is stored under the id attribute. If you're directly communicating with a backend (CouchDB, MongoDB) that uses a different unique key, you may set a Model's idAttribute to transparently map from that key to id. var Meal = Backbone.Model.extend({ idAttribute: "_id" }); var cake = new Meal({ _id: 1, name: "Cake" }); alert("Cake id: " + cake.id);

isNewmodel.isNew() Has this model been saved to the server yet? If the model does not yet have an id, it is considered to be new.

idmodel.id A special property of models, the id is an arbitrary string (integer id or UUID). If you set the id in the attributes hash, it will be copied onto the model as a direct property. Models can be retrieved by id from collections, and the id is used to generate model URLs by default.