code: function _makeJsonResponseBody (statusCode, flash) {
    const hasSession = !!R.path(['session', 'flash'], this);
  
    return {
      statusCode : statusCode,
      flash      : {
        notice : hasSession ? flash.apply(this, ['notice']) : [],
        error  : hasSession ? flash.apply(this, ['error'])  : []
      }
    };
  }
docs: Make a common JSON response body for either success or error.
  The `data` property will be merged into this object by the respective
  jsonResponseSuccess or jsonResponseError method.
  @param {Number} statusCode
  @param {Function} flash
  @returns {{statusCode: Number, flash: {notice: *, error: *}}}
  @see jsonResponseSuccess
  @see jsonResponseError
  @private