first commit

app/blog/services/category_service.go

@@ -0,0 +1,107 @@
+package services
+
+import (
+	"errors"
+	"gobeyhan/database"
+	"gobeyhan/database/models"
+
+	"gorm.io/gorm"
+)
+
+type CategoryService struct{}
+
+func NewCategoryService() *CategoryService {
+	return &CategoryService{}
+}
+
+// GetAllCategories retrieves all categories, optionally filtering by active status
+func (s *CategoryService) GetAllCategories(activeOnly bool) ([]models.Category, error) {
+	var categories []models.Category
+	query := database.DB.Preload("Parent").Preload("Children")
+
+	if activeOnly {
+		query = query.Where("is_active = ?", true)
+	}
+
+	err := query.Order("`order` ASC, created_at DESC").Find(&categories).Error
+	return categories, err
+}
+
+// GetCategoryByID retrieves a category by ID with parent and children relationships
+func (s *CategoryService) GetCategoryByID(id uint64) (*models.Category, error) {
+	var category models.Category
+	err := database.DB.
+		Preload("Parent").
+		Preload("Children").
+		First(&category, id).Error
+
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	return &category, nil
+}
+
+// GetCategoryBySlug retrieves a category by slug
+func (s *CategoryService) GetCategoryBySlug(slug string) (*models.Category, error) {
+	var category models.Category
+	err := database.DB.
+		Preload("Parent").
+		Preload("Children").
+		Where("slug = ?", slug).
+		First(&category).Error
+
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	return &category, nil
+}
+
+// CreateCategory creates a new category
+func (s *CategoryService) CreateCategory(category *models.Category) error {
+	return database.DB.Create(category).Error
+}
+
+// UpdateCategory updates an existing category
+func (s *CategoryService) UpdateCategory(id uint64, updates map[string]interface{}) error {
+	result := database.DB.Model(&models.Category{}).Where("id = ?", id).Updates(updates)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return gorm.ErrRecordNotFound
+	}
+	return nil
+}
+
+// DeleteCategory deletes a category by ID
+func (s *CategoryService) DeleteCategory(id uint64) error {
+	result := database.DB.Delete(&models.Category{}, id)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return gorm.ErrRecordNotFound
+	}
+	return nil
+}
+
+// GetCategoriesByParent retrieves child categories of a parent
+func (s *CategoryService) GetCategoriesByParent(parentID uint64, activeOnly bool) ([]models.Category, error) {
+	var categories []models.Category
+	query := database.DB.Where("parent_id = ?", parentID)
+
+	if activeOnly {
+		query = query.Where("is_active = ?", true)
+	}
+
+	err := query.Order("`order` ASC, created_at DESC").Find(&categories).Error
+	return categories, err
+}