I think you are talking about DS.Store, because it DS.Modeldoes not have a method findById.
find findById , findById, , : id. :
- store.find(App.Publication, 1/* */) store.findById
- store.find(App.Publication), store.findAll
- store.find(App.Publication, {name: 'Tom'}), store.findQuery
DS.Model.find store.find, , findById, App.Publication.find(1/* */)