unloadRecord() {
   if (this.isDestroyed) {
     return;
   }
   this._destroyRelationships();
   this.reset();
   if (!this._scheduledDestroy) {
     this._scheduledDestroy = run.backburner.schedule(
       'destroy',
       this,
       '_cleanupOrphanedRecordDatas'
     );
   }
 }

  /*
    Unload the record for this internal model. This will cause the record to be
    destroyed and freed up for garbage collection. It will also do a check
    for cleaning up internal models.

    This check is performed by first computing the set of related internal
    models. If all records in this set are unloaded, then the entire set is
    destroyed. Otherwise, nothing in the set is destroyed.

    This means that this internal model will be freed up for garbage collection
    once all models that refer to it via some relationship are also unloaded.
  */
  unloadRecord() {
    if (this.isDestroyed) {
      return;
    }
    this.send('unloadRecord');
    this.dematerializeRecord();
    if (this._scheduledDestroy === null) {
      this._scheduledDestroy = run.backburner.schedule(
        'destroy',
        this,
        '_checkForOrphanedInternalModels'
      );
    }
  }