public override RelatedModel GetProductRelationships(ProductModel productModel, string relationTypeName, bool includeBaseProductRelations = true, bool includeVariantRelations = true) { if (string.IsNullOrEmpty(relationTypeName)) { return(null); } var relationshipType = _relationshipTypeService.Get(relationTypeName); return(relationshipType != null?_relatedModelBuilder.Build(productModel, relationshipType, includeBaseProductRelations, includeVariantRelations) : null); }