#107 validate position name

back-end/src/main/java/com/example/demo/repository/PositionRepository.java

@@ -2,7 +2,13 @@
 
 import com.example.demo.entity.Position;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+
+import java.util.Optional;
 
 
 public interface PositionRepository extends JpaRepository<Position,Integer> {
+    @Query(value = "SELECT p FROM Position p WHERE p.name = :name")
+    Optional<Position> findByName(@Param("name") String name);
 }

back-end/src/main/java/com/example/demo/rest/handler/PositionHandler.java

@@ -14,11 +14,13 @@
 import lombok.AllArgsConstructor;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.data.domain.Page;
+import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Component;
 
 import java.net.URI;
 import java.util.List;
+import java.util.Optional;
 
 @Component
 @AllArgsConstructor
@@ -38,6 +40,10 @@ public ResponseEntity<?> getAll(Integer page, Integer size) {
     }
 
     public ResponseEntity<?> save(PositionDto dto) {
+        Optional<Position> existingName = positionService.getByName(dto.getName());
+        if (existingName.isPresent()) {
+            return ResponseEntity.status(HttpStatus.CONFLICT).build();
+        }
         Position position = positionMapper.toEntity(dto);
         positionService.save(position);
         PositionDto positionDto = positionMapper.toDto(position);
@@ -47,6 +53,10 @@ public ResponseEntity<?> save(PositionDto dto) {
     public ResponseEntity<?> update(Integer id, PositionDto dto){
         Position position = positionService.getById(id).
                 orElseThrow(() -> new ResourceNotFoundException(Position.class.getSimpleName(), id));
+        Optional<Position> existingName = positionService.getByName(dto.getName());
+        if (existingName.isPresent() && existingName.get().getId().equals(id)) {
+            return ResponseEntity.status(HttpStatus.CONFLICT).build();
+        }
         positionMapper.updateEntityFromDto(dto, position);
         positionService.update(position);
         return ResponseEntity.ok().build();

back-end/src/main/java/com/example/demo/service/PositionService.java

@@ -39,4 +39,8 @@ public void delete(Position position) {
     public Optional<Position> getById(Integer id) {
         return positionRepository.findById(id);
     }
+
+    public Optional<Position> getByName(String name) {
+       return positionRepository.findByName(name);
+    }
 }