js/libs/ember-data.js
function(type, id) {
    type = this.modelFor(type);

    var record = this.recordForId(type, id);

    var promise = this.fetchRecord(record) || resolve(record, "DS: Store#findById " + type + " with id: " + id);
    return promiseObject(promise);
  }
function(type, id) {
    type = this.modelFor(type);

    var record = this.recordForId(type, id);

    var promise = this.fetchRecord(record) || resolve(record, "DS: Store#findById " + type + " with id: " + id);
    return promiseObject(promise);
  }
This method returns a record for a given type and id combination.

@method findById
@private
@param {String or subclass of DS.Model} type
@param {String|Integer} id
@return {Promise} promise