public IHttpActionResult GetPricelistAssignmentById(string id)
        {
            var assignment = _pricingService.GetPricelistAssignmentById(id);
            var result     = assignment != null
                ? assignment.ToWebModel(null, _extensionManager.ConditionExpressionTree)
                : null;

            return(result != null?Ok(result) : (IHttpActionResult)NotFound());
        }
        public IHttpActionResult GetPricelistAssignmentById(string id)
        {
            var assignment = _pricingService.GetPricelistAssignmentById(id);

            if (assignment == null)
            {
                return(NotFound());
            }
            return(Ok(assignment.ToWebModel(null, _extensionManager.ConditionExpressionTree)));
        }