 
   ###*
    * @private
-   * Extend the query string by staged param
+   * Build a query string from (pre)defined params and custom search params.
    * @return {String} the query string
   ###
   _queryString: ->

  ###
  @baseResourceEndpoint: '/product-projections'

  _setDefaults: ->
    super()
    @_customParams =

        facet: []

  ###*
   * Define whether to query for staged or current product projection.
   * @param Boolean [staged] true to query staged products (default). False to query published products
   * @return {ProductProjectionService} Chained instance of this class
  ###
