destroy(model) {
    this._removeItem(this._itemName(model.id));
    const newRecords = without(this.records, model.id.toString());

    this.records = newRecords;
    this.save();

    return model;
  }
Delete a model from `this.data`, returning it.
@param {Model} model - Model to delete
@returns {Model} Model removed from this.data