Merge pull request #163 from LionnoiL/212-fix-400-error-for-get-adv-b…

…y-category

fixed 400 error for adv by category

src/main/java/org/petmarket/advertisements/advertisement/service/AdvertisementService.java

@@ -101,7 +101,7 @@ public Page<Advertisement> getByCategoryTypeCitiesAttributes(
 
         Specification<Object> where = Specification.where((root, query, criteriaBuilder) -> {
             List<Predicate> predicates = new ArrayList<>();
-            root.fetch("author");
+            root.join("author");
 
             if (category != null) {
                 predicates.add(criteriaBuilder.equal(root.get("category"), category));