配方领域层方法+重构配方领域

internal/domain/recipe/nutrient_service.go

@@ -0,0 +1,146 @@
+package recipe
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"git.huangwc.com/pig/pig-farm-controller/internal/infra/logs"
+	"git.huangwc.com/pig/pig-farm-controller/internal/infra/models"
+	"git.huangwc.com/pig/pig-farm-controller/internal/infra/repository"
+
+	"gorm.io/gorm"
+)
+
+// 定义领域特定的错误
+var (
+	ErrNutrientNameConflict = fmt.Errorf("营养种类名称已存在")
+	ErrNutrientNotFound     = fmt.Errorf("营养种类不存在")
+)
+
+// NutrientService 定义了营养种类领域的核心业务服务接口
+type NutrientService interface {
+	CreateNutrient(ctx context.Context, name, description string) (*models.Nutrient, error)
+	UpdateNutrient(ctx context.Context, id uint32, name, description string) (*models.Nutrient, error)
+	DeleteNutrient(ctx context.Context, id uint32) error
+	GetNutrient(ctx context.Context, id uint32) (*models.Nutrient, error)
+	ListNutrients(ctx context.Context, opts repository.NutrientListOptions, page, pageSize int) ([]models.Nutrient, int64, error)
+}
+
+// nutrientServiceImpl 是 NutrientService 的实现
+type nutrientServiceImpl struct {
+	ctx          context.Context
+	nutrientRepo repository.NutrientRepository
+}
+
+// NewNutrientService 创建一个新的 NutrientService 实例
+func NewNutrientService(ctx context.Context, nutrientRepo repository.NutrientRepository) NutrientService {
+	return &nutrientServiceImpl{
+		ctx:          ctx,
+		nutrientRepo: nutrientRepo,
+	}
+}
+
+// CreateNutrient 实现了创建营养种类的核心业务逻辑
+func (s *nutrientServiceImpl) CreateNutrient(ctx context.Context, name, description string) (*models.Nutrient, error) {
+	serviceCtx := logs.AddFuncName(ctx, s.ctx, "CreateNutrient")
+
+	// 检查名称是否已存在
+	existing, err := s.nutrientRepo.GetNutrientByName(serviceCtx, name)
+	if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) { // 只有不是记录未找到的错误才返回
+		return nil, fmt.Errorf("检查营养种类名称失败: %w", err)
+	}
+	if existing != nil {
+		return nil, ErrNutrientNameConflict
+	}
+
+	nutrient := &models.Nutrient{
+		Name:        name,
+		Description: description,
+	}
+
+	if err := s.nutrientRepo.CreateNutrient(serviceCtx, nutrient); err != nil {
+		return nil, fmt.Errorf("创建营养种类失败: %w", err)
+	}
+
+	return nutrient, nil
+}
+
+// UpdateNutrient 实现了更新营养种类的核心业务逻辑
+func (s *nutrientServiceImpl) UpdateNutrient(ctx context.Context, id uint32, name, description string) (*models.Nutrient, error) {
+	serviceCtx := logs.AddFuncName(ctx, s.ctx, "UpdateNutrient")
+
+	// 检查要更新的实体是否存在
+	nutrient, err := s.nutrientRepo.GetNutrientByID(serviceCtx, id)
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) { // 如果是记录未找到错误，则返回领域错误
+			return nil, ErrNutrientNotFound
+		}
+		return nil, fmt.Errorf("获取待更新的营养种类失败: %w", err)
+	}
+
+	// 如果名称有变动，检查新名称是否与其它记录冲突
+	if nutrient.Name != name {
+		existing, err := s.nutrientRepo.GetNutrientByName(serviceCtx, name)
+		if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, fmt.Errorf("检查新的营养种类名称失败: %w", err)
+		}
+		if existing != nil && existing.ID != id {
+			return nil, ErrNutrientNameConflict
+		}
+	}
+
+	nutrient.Name = name
+	nutrient.Description = description
+
+	if err := s.nutrientRepo.UpdateNutrient(serviceCtx, nutrient); err != nil {
+		return nil, fmt.Errorf("更新营养种类失败: %w", err)
+	}
+
+	return nutrient, nil
+}
+
+// DeleteNutrient 实现了删除营养种类的核心业务逻辑
+func (s *nutrientServiceImpl) DeleteNutrient(ctx context.Context, id uint32) error {
+	serviceCtx := logs.AddFuncName(ctx, s.ctx, "DeleteNutrient")
+
+	// 检查实体是否存在
+	_, err := s.nutrientRepo.GetNutrientByID(serviceCtx, id)
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return ErrNutrientNotFound
+		}
+		return fmt.Errorf("获取待删除的营养种类失败: %w", err)
+	}
+
+	if err := s.nutrientRepo.DeleteNutrient(serviceCtx, id); err != nil {
+		return fmt.Errorf("删除营养种类失败: %w", err)
+	}
+
+	return nil
+}
+
+// GetNutrient 实现了获取单个营养种类的逻辑
+func (s *nutrientServiceImpl) GetNutrient(ctx context.Context, id uint32) (*models.Nutrient, error) {
+	serviceCtx := logs.AddFuncName(ctx, s.ctx, "GetNutrient")
+
+	nutrient, err := s.nutrientRepo.GetNutrientByID(serviceCtx, id)
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, ErrNutrientNotFound
+		}
+		return nil, fmt.Errorf("获取营养种类失败: %w", err)
+	}
+	return nutrient, nil
+}
+
+// ListNutrients 实现了列出营养种类的逻辑
+func (s *nutrientServiceImpl) ListNutrients(ctx context.Context, opts repository.NutrientListOptions, page, pageSize int) ([]models.Nutrient, int64, error) {
+	serviceCtx := logs.AddFuncName(ctx, s.ctx, "ListNutrients")
+
+	nutrients, total, err := s.nutrientRepo.ListNutrients(serviceCtx, opts, page, pageSize)
+	if err != nil {
+		return nil, 0, fmt.Errorf("获取营养种类列表失败: %w", err)
+	}
+	return nutrients, total, nil
+}