DTO (Data Transfer Object)#

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public record SubcategoryDTO(
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    @NotNull(message = "Category id is required") @JsonProperty("category_id") Long categoryId,
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    @NotEmpty(message = "Sub Category name is required") Set<String> name
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) {}

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@JsonPropertyOrder({
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    "id",
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    "name",
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    "created_at",
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    "updated_at"
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})
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public record CategoryResponse(
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    Long id,
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    String name,
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    TreeSet<Subcategory> subcategories,
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    @JsonIgnore @JsonProperty("created_at") @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss.SSSSSS") LocalDateTime createdAt,
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    @JsonIgnore @JsonProperty("updated_at") @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss.SSSSSS") LocalDateTime updatedAt
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) {}

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@Getter
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@Setter
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@SuperBuilder
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@NoArgsConstructor
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@AllArgsConstructor
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@Entity
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@Table(name = "categories")
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public class Category extends BaseEntity {
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    @Id
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    @SequenceGenerator(name = "categories_seq", sequenceName = "categories_id_seq", allocationSize = 1)
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    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "categories_seq")
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    @Column(name="id", unique=true, nullable=false)
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    @JsonProperty("id")
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    private Long id;
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    private String name;
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    @OneToMany(mappedBy = "category")
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    private Set<Subcategory> subcategories;
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}

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    @PostMapping("/sub")
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    @PreAuthorize("hasRole('ROLE_MANAGER')")
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    public ResponseEntity<ApiResponse<CreateNewSubcategoryResponse>> createSubCategory(
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        @Valid @RequestBody SubcategoryDTO subcategoryDTO,
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        BindingResult result
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    ) {
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        if (result.hasErrors()) {
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            throw new MethodArgumentNotValidException(result);
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        }
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        return ResponseEntity.status(HttpStatus.CREATED).body(
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            ApiResponse.<CreateNewSubcategoryResponse>builder()
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                .message("Create sub category successfully")
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                .statusCode(HttpStatus.CREATED.value())
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                .isSuccess(true)
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                .data(categoryService.createSubCategory(subcategoryDTO))
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                .build()
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        );
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    }

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    @Override
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    public CreateNewSubcategoryResponse createSubCategory(SubcategoryDTO subcategoryDTO)
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        throws DataNotFoundException, DataAlreadyExistException {
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        Category category = categoryRepository.findById(subcategoryDTO.categoryId())
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            .orElseThrow(() -> new CategoryNotFoundException("Category not found"));
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        if (subcategoryRepository.existsByCategoryIdAndNameIn(category.getId(), subcategoryDTO.name())) {
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            throw new DataAlreadyExistException("Subcategory already exist in category: " + category.getId());
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        }
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        subcategoryDTO.name().forEach(name -> {
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            subcategoryRepository.save(
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                Subcategory.builder()
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                    .name(name)
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                    .category(category)
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                    .build());
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        });
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        return new CreateNewSubcategoryResponse(categoryMapper.toCategoryResponse(category));
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    }