#148 prevent product category from repeating

retail-managment-system/rms-api/src/main/java/com/rms/repository/ProductCategoryRepository.java

@@ -2,8 +2,14 @@
 
 import com.rms.domain.core.ProductCategory;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
 import org.springframework.stereotype.Repository;
 
+import java.util.Optional;
+
 @Repository
 public interface ProductCategoryRepository extends JpaRepository<ProductCategory, Integer> {
+    @Query(value = "select pc from ProductCategory pc where pc.name= :name" )
+    Optional<ProductCategory> findByName(@Param("name")String name);
 }

retail-managment-system/rms-api/src/main/java/com/rms/rest/handler/ProductCategoryHandler.java

@@ -4,10 +4,7 @@
 import com.rms.domain.investor.Transaction;
 import com.rms.rest.dto.ProductCategoryDto;
 import com.rms.rest.dto.common.PaginatedResultDto;
-import com.rms.rest.exception.ErrorCodes;
-import com.rms.rest.exception.ResourceNotFoundException;
-import com.rms.rest.exception.ResourceRelatedException;
-import com.rms.rest.exception.Response;
+import com.rms.rest.exception.*;
 import com.rms.rest.modelmapper.ProductCategoryMapper;
 import com.rms.rest.modelmapper.common.PaginationMapper;
 import com.rms.service.ProductCategoryService;
@@ -18,6 +15,7 @@
 import org.springframework.stereotype.Component;
 
 import java.util.List;
+import java.util.Optional;
 
 @Component
 @AllArgsConstructor
@@ -43,16 +41,31 @@ public ResponseEntity<ProductCategoryDto> getById(Integer id) {
     }
 
     public ResponseEntity<ProductCategoryDto> save(ProductCategoryDto productCategoryDto) {
+        Optional<ProductCategory>productCategoryexist=productCategoryService.findByName(productCategoryDto.getName());
+
+        if(productCategoryexist.isPresent())
+        {
+
+            throw new ResourceAlreadyExistsException(ProductCategory.class.getSimpleName(),
+                    "product category name",productCategoryDto.getName(),ErrorCodes.DUPLICATE_RESOURCE.getCode());
+        }
         ProductCategory productCategory = mapper.toEntity(productCategoryDto);
         productCategoryService.save(productCategory);
         ProductCategoryDto dto = mapper.toDto(productCategory);
         return ResponseEntity.ok(dto);
     }
 
     public ResponseEntity<ProductCategoryDto> update(ProductCategoryDto productCategoryDto, Integer id) {
+        Optional<ProductCategory>productCategoryexist=productCategoryService.findByName(productCategoryDto.getName());
+        if(productCategoryexist.isPresent()&&!productCategoryexist.get().getId().equals(id))
+        {
+            throw new ResourceAlreadyExistsException(ProductCategory.class.getSimpleName(),
+                    "product category name",productCategoryDto.getName(),ErrorCodes.DUPLICATE_RESOURCE.getCode());
+        }
         ProductCategory productCategory = productCategoryService.getById(id)
                 .orElseThrow(() -> new ResourceNotFoundException(ProductCategory.class.getSimpleName(), id));
         mapper.updateEntityFromDto(productCategoryDto, productCategory);
+        productCategory.setId(id);
         productCategoryService.save(productCategory);
         ProductCategoryDto dto = mapper.toDto(productCategory);
         return ResponseEntity.ok(dto);

retail-managment-system/rms-api/src/main/java/com/rms/service/ProductCategoryService.java

@@ -23,6 +23,11 @@ public Optional<ProductCategory> getById(Integer id) {
         return productCategoryRepository.findById(id);
     }
 
+    public Optional<ProductCategory>findByName(String name)
+    {
+        return productCategoryRepository.findByName(name);
+    }
+
     public ProductCategory save(ProductCategory category) {
         return productCategoryRepository.save(category);
     }