Update purchase for product category (inventory type)

internal/app/app.go

@@ -372,7 +372,7 @@ func (a *App) initProcessors(cfg *config.Config, repos *repositories) *processor
 		ingredientProcessor:                 processor.NewIngredientProcessor(repos.ingredientRepo, repos.unitRepo, repos.ingredientCompositionRepo),
 		productRecipeProcessor:              processor.NewProductRecipeProcessor(repos.productRecipeRepo, repos.productRepo, repos.ingredientRepo),
 		vendorProcessor:                     processor.NewVendorProcessorImpl(repos.vendorRepo),
-		purchaseOrderProcessor:              processor.NewPurchaseOrderProcessorImpl(repos.purchaseOrderRepo, repos.vendorRepo, repos.ingredientRepo, repos.unitRepo, repos.fileRepo, inventoryMovementService, repos.unitConverterRepo),
+		purchaseOrderProcessor:              processor.NewPurchaseOrderProcessorImpl(repos.purchaseOrderRepo, repos.vendorRepo, repos.ingredientRepo, repos.purchaseCategoryRepo, repos.unitRepo, repos.fileRepo, inventoryMovementService, repos.unitConverterRepo),
 		purchaseCategoryProcessor:           processor.NewPurchaseCategoryProcessorImpl(repos.purchaseCategoryRepo),
 		unitConverterProcessor:              processor.NewIngredientUnitConverterProcessorImpl(repos.unitConverterRepo, repos.ingredientRepo, repos.unitRepo),
 		chartOfAccountTypeProcessor:         processor.NewChartOfAccountTypeProcessorImpl(repos.chartOfAccountTypeRepo),

internal/contract/purchase_order_contract.go

@@ -20,6 +20,7 @@ type CreatePurchaseOrderRequest struct {
 
 type CreatePurchaseOrderItemRequest struct {
 	IngredientID       uuid.UUID `json:"ingredient_id" validate:"required"`
+	PurchaseCategoryID uuid.UUID `json:"purchase_category_id" validate:"required"`
 	Description        *string   `json:"description,omitempty" validate:"omitempty"`
 	Quantity           float64   `json:"quantity" validate:"required,gt=0"`
 	UnitID             uuid.UUID `json:"unit_id" validate:"required"`
@@ -41,6 +42,7 @@ type UpdatePurchaseOrderRequest struct {
 type UpdatePurchaseOrderItemRequest struct {
 	ID                 *uuid.UUID `json:"id,omitempty"` // For existing items
 	IngredientID       *uuid.UUID `json:"ingredient_id,omitempty" validate:"omitempty"`
+	PurchaseCategoryID *uuid.UUID `json:"purchase_category_id,omitempty" validate:"omitempty"`
 	Description        *string    `json:"description,omitempty" validate:"omitempty"`
 	Quantity           *float64   `json:"quantity,omitempty" validate:"omitempty,gt=0"`
 	UnitID             *uuid.UUID `json:"unit_id,omitempty" validate:"omitempty"`
@@ -69,6 +71,7 @@ type PurchaseOrderItemResponse struct {
 	ID                 uuid.UUID                 `json:"id"`
 	PurchaseOrderID    uuid.UUID                 `json:"purchase_order_id"`
 	IngredientID       uuid.UUID                 `json:"ingredient_id"`
+	PurchaseCategoryID uuid.UUID                 `json:"purchase_category_id"`
 	Description        *string                   `json:"description"`
 	Quantity           float64                   `json:"quantity"`
 	UnitID             uuid.UUID                 `json:"unit_id"`
@@ -76,6 +79,7 @@ type PurchaseOrderItemResponse struct {
 	CreatedAt          time.Time                 `json:"created_at"`
 	UpdatedAt          time.Time                 `json:"updated_at"`
 	Ingredient         *IngredientResponse       `json:"ingredient,omitempty"`
+	PurchaseCategory   *PurchaseCategoryResponse `json:"purchase_category,omitempty"`
 	Unit               *UnitResponse             `json:"unit,omitempty"`
 }
 

internal/entities/inventory_movement.go

@@ -49,6 +49,7 @@ type InventoryMovement struct {
 	TotalCost           float64                         `gorm:"type:decimal(12,2);default:0.00" json:"total_cost"`
 	ReferenceType       *InventoryMovementReferenceType `gorm:"size:50" json:"reference_type"`
 	ReferenceID         *uuid.UUID                      `gorm:"type:uuid;index" json:"reference_id"`
+	PurchaseOrderItemID *uuid.UUID                      `gorm:"type:uuid;index" json:"purchase_order_item_id"`
 	OrderID             *uuid.UUID                      `gorm:"type:uuid;index" json:"order_id"`
 	PaymentID           *uuid.UUID                      `gorm:"type:uuid;index" json:"payment_id"`
 	UserID              uuid.UUID                       `gorm:"type:uuid;not null;index" json:"user_id" validate:"required"`
@@ -61,6 +62,7 @@ type InventoryMovement struct {
 	Outlet            Outlet             `gorm:"foreignKey:OutletID" json:"outlet,omitempty"`
 	Product           *Product           `gorm:"foreignKey:ItemID" json:"product,omitempty"`
 	Ingredient        *Ingredient        `gorm:"foreignKey:ItemID" json:"ingredient,omitempty"`
+	PurchaseOrderItem *PurchaseOrderItem `gorm:"foreignKey:PurchaseOrderItemID" json:"purchase_order_item,omitempty"`
 	Order             *Order             `gorm:"foreignKey:OrderID" json:"order,omitempty"`
 	Payment           *Payment           `gorm:"foreignKey:PaymentID" json:"payment,omitempty"`
 	User              User               `gorm:"foreignKey:UserID" json:"user,omitempty"`

internal/entities/purchase_order.go

@@ -44,6 +44,7 @@ type PurchaseOrderItem struct {
 	ID                 uuid.UUID `gorm:"type:uuid;primary_key;default:gen_random_uuid()" json:"id"`
 	PurchaseOrderID    uuid.UUID `gorm:"type:uuid;not null" json:"purchase_order_id" validate:"required"`
 	IngredientID       uuid.UUID `gorm:"type:uuid;not null" json:"ingredient_id" validate:"required"`
+	PurchaseCategoryID uuid.UUID `gorm:"type:uuid;not null;index" json:"purchase_category_id" validate:"required"`
 	Description        *string   `gorm:"type:text" json:"description" validate:"omitempty"`
 	Quantity           float64   `gorm:"type:decimal(10,3);not null" json:"quantity" validate:"required,gt=0"`
 	UnitID             uuid.UUID `gorm:"type:uuid;not null" json:"unit_id" validate:"required"`
@@ -53,6 +54,7 @@ type PurchaseOrderItem struct {
 
 	PurchaseOrder    *PurchaseOrder    `gorm:"foreignKey:PurchaseOrderID" json:"purchase_order,omitempty"`
 	Ingredient       *Ingredient       `gorm:"foreignKey:IngredientID" json:"ingredient,omitempty"`
+	PurchaseCategory *PurchaseCategory `gorm:"foreignKey:PurchaseCategoryID" json:"purchase_category,omitempty"`
 	Unit             *Unit             `gorm:"foreignKey:UnitID" json:"unit,omitempty"`
 }
 

internal/mappers/purchase_order_mapper.go

@@ -94,6 +94,7 @@ func PurchaseOrderItemEntityToModel(entity *entities.PurchaseOrderItem) *models.
 		ID:                 entity.ID,
 		PurchaseOrderID:    entity.PurchaseOrderID,
 		IngredientID:       entity.IngredientID,
+		PurchaseCategoryID: entity.PurchaseCategoryID,
 		Description:        entity.Description,
 		Quantity:           entity.Quantity,
 		UnitID:             entity.UnitID,
@@ -112,6 +113,7 @@ func PurchaseOrderItemModelToEntity(model *models.PurchaseOrderItem) *entities.P
 		ID:                 model.ID,
 		PurchaseOrderID:    model.PurchaseOrderID,
 		IngredientID:       model.IngredientID,
+		PurchaseCategoryID: model.PurchaseCategoryID,
 		Description:        model.Description,
 		Quantity:           model.Quantity,
 		UnitID:             model.UnitID,
@@ -130,6 +132,7 @@ func PurchaseOrderItemEntityToResponse(entity *entities.PurchaseOrderItem) *mode
 		ID:                 entity.ID,
 		PurchaseOrderID:    entity.PurchaseOrderID,
 		IngredientID:       entity.IngredientID,
+		PurchaseCategoryID: entity.PurchaseCategoryID,
 		Description:        entity.Description,
 		Quantity:           entity.Quantity,
 		UnitID:             entity.UnitID,
@@ -146,6 +149,10 @@ func PurchaseOrderItemEntityToResponse(entity *entities.PurchaseOrderItem) *mode
 		}
 	}
 
+	if entity.PurchaseCategory != nil {
+		response.PurchaseCategory = PurchaseCategoryEntityToResponse(entity.PurchaseCategory)
+	}
+
 	// Map unit if present
 	if entity.Unit != nil {
 		response.Unit = &models.UnitResponse{

internal/models/purchase_order.go

@@ -25,6 +25,7 @@ type PurchaseOrderItem struct {
 	ID                 uuid.UUID `json:"id"`
 	PurchaseOrderID    uuid.UUID `json:"purchase_order_id"`
 	IngredientID       uuid.UUID `json:"ingredient_id"`
+	PurchaseCategoryID uuid.UUID `json:"purchase_category_id"`
 	Description        *string   `json:"description"`
 	Quantity           float64   `json:"quantity"`
 	UnitID             uuid.UUID `json:"unit_id"`
@@ -62,6 +63,7 @@ type PurchaseOrderItemResponse struct {
 	ID                 uuid.UUID                 `json:"id"`
 	PurchaseOrderID    uuid.UUID                 `json:"purchase_order_id"`
 	IngredientID       uuid.UUID                 `json:"ingredient_id"`
+	PurchaseCategoryID uuid.UUID                 `json:"purchase_category_id"`
 	Description        *string                   `json:"description"`
 	Quantity           float64                   `json:"quantity"`
 	UnitID             uuid.UUID                 `json:"unit_id"`
@@ -69,6 +71,7 @@ type PurchaseOrderItemResponse struct {
 	CreatedAt          time.Time                 `json:"created_at"`
 	UpdatedAt          time.Time                 `json:"updated_at"`
 	Ingredient         *IngredientResponse       `json:"ingredient,omitempty"`
+	PurchaseCategory   *PurchaseCategoryResponse `json:"purchase_category,omitempty"`
 	Unit               *UnitResponse             `json:"unit,omitempty"`
 }
 
@@ -94,6 +97,7 @@ type CreatePurchaseOrderRequest struct {
 
 type CreatePurchaseOrderItemRequest struct {
 	IngredientID       uuid.UUID `json:"ingredient_id"`
+	PurchaseCategoryID uuid.UUID `json:"purchase_category_id"`
 	Description        *string   `json:"description,omitempty"`
 	Quantity           float64   `json:"quantity"`
 	UnitID             uuid.UUID `json:"unit_id"`
@@ -115,6 +119,7 @@ type UpdatePurchaseOrderRequest struct {
 type UpdatePurchaseOrderItemRequest struct {
 	ID                 *uuid.UUID `json:"id,omitempty"` // For existing items
 	IngredientID       *uuid.UUID `json:"ingredient_id,omitempty"`
+	PurchaseCategoryID *uuid.UUID `json:"purchase_category_id,omitempty"`
 	Description        *string    `json:"description,omitempty"`
 	Quantity           *float64   `json:"quantity,omitempty"`
 	UnitID             *uuid.UUID `json:"unit_id,omitempty"`

internal/processor/order_processor.go

@@ -86,7 +86,7 @@ type CustomerRepository interface {
 }
 
 type InventoryMovementService interface {
-	CreateIngredientMovement(ctx context.Context, ingredientID, organizationID, outletID, userID uuid.UUID, movementType entities.InventoryMovementType, quantity float64, unitCost float64, reason string, referenceType *entities.InventoryMovementReferenceType, referenceID *uuid.UUID) error
+	CreateIngredientMovement(ctx context.Context, ingredientID, organizationID, outletID, userID uuid.UUID, movementType entities.InventoryMovementType, quantity float64, unitCost float64, reason string, referenceType *entities.InventoryMovementReferenceType, referenceID *uuid.UUID, purchaseOrderItemID *uuid.UUID) error
 	CreateProductMovement(ctx context.Context, productID, organizationID, outletID, userID uuid.UUID, movementType entities.InventoryMovementType, quantity float64, unitCost float64, reason string, referenceType *entities.InventoryMovementReferenceType, referenceID *uuid.UUID) error
 }
 

internal/processor/purchase_order_processor.go

@@ -25,6 +25,7 @@ type PurchaseOrderProcessorImpl struct {
 	purchaseOrderRepo        PurchaseOrderRepository
 	vendorRepo               VendorRepository
 	ingredientRepo           IngredientRepository
+	purchaseCategoryRepo     PurchaseCategoryRepository
 	unitRepo                 UnitRepository
 	fileRepo                 FileRepository
 	inventoryMovementService InventoryMovementService
@@ -35,6 +36,7 @@ func NewPurchaseOrderProcessorImpl(
 	purchaseOrderRepo PurchaseOrderRepository,
 	vendorRepo VendorRepository,
 	ingredientRepo IngredientRepository,
+	purchaseCategoryRepo PurchaseCategoryRepository,
 	unitRepo UnitRepository,
 	fileRepo FileRepository,
 	inventoryMovementService InventoryMovementService,
@@ -44,6 +46,7 @@ func NewPurchaseOrderProcessorImpl(
 		purchaseOrderRepo:        purchaseOrderRepo,
 		vendorRepo:               vendorRepo,
 		ingredientRepo:           ingredientRepo,
+		purchaseCategoryRepo:     purchaseCategoryRepo,
 		unitRepo:                 unitRepo,
 		fileRepo:                 fileRepo,
 		inventoryMovementService: inventoryMovementService,
@@ -64,13 +67,17 @@ func (p *PurchaseOrderProcessorImpl) CreatePurchaseOrder(ctx context.Context, or
 		return nil, fmt.Errorf("purchase order with PO number %s already exists in this organization", req.PONumber)
 	}
 
-	// Validate ingredients and units exist
+	// Validate ingredients, raw-material categories, and units exist
 	for i, item := range req.Items {
 		_, err := p.ingredientRepo.GetByID(ctx, item.IngredientID, organizationID)
 		if err != nil {
 			return nil, fmt.Errorf("ingredient not found for item %d: %w", i, err)
 		}
 
+		if err := p.validateRawMaterialPurchaseCategory(ctx, item.PurchaseCategoryID, organizationID, i); err != nil {
+			return nil, err
+		}
+
 		_, err = p.unitRepo.GetByID(ctx, item.UnitID, organizationID)
 		if err != nil {
 			return nil, fmt.Errorf("unit not found for item %d: %w", i, err)
@@ -111,6 +118,7 @@ func (p *PurchaseOrderProcessorImpl) CreatePurchaseOrder(ctx context.Context, or
 		itemEntity := &entities.PurchaseOrderItem{
 			PurchaseOrderID:    poEntity.ID,
 			IngredientID:       itemReq.IngredientID,
+			PurchaseCategoryID: itemReq.PurchaseCategoryID,
 			Description:        itemReq.Description,
 			Quantity:           itemReq.Quantity,
 			UnitID:             itemReq.UnitID,
@@ -197,7 +205,7 @@ func (p *PurchaseOrderProcessorImpl) UpdatePurchaseOrder(ctx context.Context, id
 
 		// Create new items
 		totalAmount := 0.0
-		for _, itemReq := range req.Items {
+		for i, itemReq := range req.Items {
 			// Validate ingredients and units exist
 			if itemReq.IngredientID != nil {
 				_, err := p.ingredientRepo.GetByID(ctx, *itemReq.IngredientID, organizationID)
@@ -213,8 +221,15 @@ func (p *PurchaseOrderProcessorImpl) UpdatePurchaseOrder(ctx context.Context, id
 				}
 			}
 
+			if itemReq.PurchaseCategoryID != nil {
+				if err := p.validateRawMaterialPurchaseCategory(ctx, *itemReq.PurchaseCategoryID, organizationID, i); err != nil {
+					return nil, err
+				}
+			}
+
 			// Use existing values if not provided
 			ingredientID := poEntity.Items[0].IngredientID // This is a simplified approach
+			purchaseCategoryID := poEntity.Items[0].PurchaseCategoryID
 			unitID := poEntity.Items[0].UnitID
 			quantity := poEntity.Items[0].Quantity
 			amount := poEntity.Items[0].Amount
@@ -226,6 +241,9 @@ func (p *PurchaseOrderProcessorImpl) UpdatePurchaseOrder(ctx context.Context, id
 			if itemReq.UnitID != nil {
 				unitID = *itemReq.UnitID
 			}
+			if itemReq.PurchaseCategoryID != nil {
+				purchaseCategoryID = *itemReq.PurchaseCategoryID
+			}
 			if itemReq.Quantity != nil {
 				quantity = *itemReq.Quantity
 			}
@@ -239,6 +257,7 @@ func (p *PurchaseOrderProcessorImpl) UpdatePurchaseOrder(ctx context.Context, id
 			itemEntity := &entities.PurchaseOrderItem{
 				PurchaseOrderID:    poEntity.ID,
 				IngredientID:       ingredientID,
+				PurchaseCategoryID: purchaseCategoryID,
 				Description:        description,
 				Quantity:           quantity,
 				UnitID:             unitID,
@@ -419,6 +438,7 @@ func (p *PurchaseOrderProcessorImpl) UpdatePurchaseOrderStatus(ctx context.Conte
 				reason,
 				&referenceType,
 				referenceID,
+				&item.ID,
 			)
 			if err != nil {
 				return nil, fmt.Errorf("failed to create inventory movement for ingredient %s: %w", item.IngredientID, err)
@@ -440,3 +460,20 @@ func (p *PurchaseOrderProcessorImpl) UpdatePurchaseOrderStatus(ctx context.Conte
 
 	return mappers.PurchaseOrderEntityToResponse(updatedPO), nil
 }
+
+func (p *PurchaseOrderProcessorImpl) validateRawMaterialPurchaseCategory(ctx context.Context, categoryID, organizationID uuid.UUID, itemIndex int) error {
+	category, err := p.purchaseCategoryRepo.GetByIDAndOrganizationID(ctx, categoryID, organizationID)
+	if err != nil {
+		return fmt.Errorf("purchase category not found for item %d: %w", itemIndex, err)
+	}
+
+	if !category.IsActive {
+		return fmt.Errorf("purchase category for item %d is inactive", itemIndex)
+	}
+
+	if category.Type != entities.PurchaseCategoryTypeRawMaterial {
+		return fmt.Errorf("purchase category for item %d must be raw_material", itemIndex)
+	}
+
+	return nil
+}

internal/repository/purchase_order_repository.go

@@ -31,6 +31,7 @@ func (r *PurchaseOrderRepositoryImpl) GetByID(ctx context.Context, id uuid.UUID)
 	err := r.db.WithContext(ctx).
 		Preload("Vendor").
 		Preload("Items.Ingredient").
+		Preload("Items.PurchaseCategory").
 		Preload("Items.Unit").
 		Preload("Attachments.File").
 		First(&po, "id = ?", id).Error
@@ -45,6 +46,7 @@ func (r *PurchaseOrderRepositoryImpl) GetByIDAndOrganizationID(ctx context.Conte
 	err := r.db.WithContext(ctx).
 		Preload("Vendor").
 		Preload("Items.Ingredient").
+		Preload("Items.PurchaseCategory").
 		Preload("Items.Unit").
 		Preload("Attachments.File").
 		Where("id = ? AND organization_id = ?", id, organizationID).
@@ -105,6 +107,7 @@ func (r *PurchaseOrderRepositoryImpl) List(ctx context.Context, organizationID u
 	err := query.
 		Preload("Vendor").
 		Preload("Items.Ingredient").
+		Preload("Items.PurchaseCategory").
 		Preload("Items.Unit").
 		Preload("Attachments.File").
 		Order("created_at DESC").
@@ -168,6 +171,7 @@ func (r *PurchaseOrderRepositoryImpl) GetByStatus(ctx context.Context, organizat
 		Where("organization_id = ? AND status = ?", organizationID, status).
 		Preload("Vendor").
 		Preload("Items.Ingredient").
+		Preload("Items.PurchaseCategory").
 		Preload("Items.Unit").
 		Find(&pos).Error
 	return pos, err
@@ -179,6 +183,7 @@ func (r *PurchaseOrderRepositoryImpl) GetOverdue(ctx context.Context, organizati
 		Where("organization_id = ? AND due_date < ? AND status IN (?)", organizationID, time.Now(), []string{"draft", "sent", "approved"}).
 		Preload("Vendor").
 		Preload("Items.Ingredient").
+		Preload("Items.PurchaseCategory").
 		Preload("Items.Unit").
 		Find(&pos).Error
 	return pos, err
@@ -219,6 +224,7 @@ func (r *PurchaseOrderRepositoryImpl) GetItemsByPurchaseOrderID(ctx context.Cont
 	var items []*entities.PurchaseOrderItem
 	err := r.db.WithContext(ctx).
 		Preload("Ingredient").
+		Preload("PurchaseCategory").
 		Preload("Unit").
 		Where("purchase_order_id = ?", purchaseOrderID).
 		Find(&items).Error

internal/service/inventory_movement_service.go

@@ -10,7 +10,7 @@ import (
 )
 
 type InventoryMovementService interface {
-	CreateIngredientMovement(ctx context.Context, ingredientID, organizationID, outletID, userID uuid.UUID, movementType entities.InventoryMovementType, quantity float64, unitCost float64, reason string, referenceType *entities.InventoryMovementReferenceType, referenceID *uuid.UUID) error
+	CreateIngredientMovement(ctx context.Context, ingredientID, organizationID, outletID, userID uuid.UUID, movementType entities.InventoryMovementType, quantity float64, unitCost float64, reason string, referenceType *entities.InventoryMovementReferenceType, referenceID *uuid.UUID, purchaseOrderItemID *uuid.UUID) error
 	CreateProductMovement(ctx context.Context, productID, organizationID, outletID, userID uuid.UUID, movementType entities.InventoryMovementType, quantity float64, unitCost float64, reason string, referenceType *entities.InventoryMovementReferenceType, referenceID *uuid.UUID) error
 }
 
@@ -26,7 +26,7 @@ func NewInventoryMovementService(inventoryMovementRepo repository.InventoryMovem
 	}
 }
 
-func (s *InventoryMovementServiceImpl) CreateIngredientMovement(ctx context.Context, ingredientID, organizationID, outletID, userID uuid.UUID, movementType entities.InventoryMovementType, quantity float64, unitCost float64, reason string, referenceType *entities.InventoryMovementReferenceType, referenceID *uuid.UUID) error {
+func (s *InventoryMovementServiceImpl) CreateIngredientMovement(ctx context.Context, ingredientID, organizationID, outletID, userID uuid.UUID, movementType entities.InventoryMovementType, quantity float64, unitCost float64, reason string, referenceType *entities.InventoryMovementReferenceType, referenceID *uuid.UUID, purchaseOrderItemID *uuid.UUID) error {
 	ingredient, err := s.ingredientRepo.GetByID(ctx, ingredientID, organizationID)
 	if err != nil {
 		return err
@@ -49,6 +49,7 @@ func (s *InventoryMovementServiceImpl) CreateIngredientMovement(ctx context.Cont
 		TotalCost:           unitCost * quantity,
 		ReferenceType:       referenceType,
 		ReferenceID:         referenceID,
+		PurchaseOrderItemID: purchaseOrderItemID,
 		UserID:              userID,
 		Reason:              &reason,
 		CreatedAt:           time.Now(),

internal/transformer/purchase_order_transformer.go

@@ -12,6 +12,7 @@ func CreatePurchaseOrderRequestToModel(req *contract.CreatePurchaseOrderRequest)
 	for i, item := range req.Items {
 		items[i] = models.CreatePurchaseOrderItemRequest{
 			IngredientID:       item.IngredientID,
+			PurchaseCategoryID: item.PurchaseCategoryID,
 			Description:        item.Description,
 			Quantity:           item.Quantity,
 			UnitID:             item.UnitID,
@@ -56,6 +57,7 @@ func UpdatePurchaseOrderRequestToModel(req *contract.UpdatePurchaseOrderRequest)
 			items[i] = models.UpdatePurchaseOrderItemRequest{
 				ID:                 item.ID,
 				IngredientID:       item.IngredientID,
+				PurchaseCategoryID: item.PurchaseCategoryID,
 				Description:        item.Description,
 				Quantity:           item.Quantity,
 				UnitID:             item.UnitID,
@@ -157,6 +159,7 @@ func PurchaseOrderModelResponseToResponse(po *models.PurchaseOrderResponse) *con
 				ID:                 item.ID,
 				PurchaseOrderID:    item.PurchaseOrderID,
 				IngredientID:       item.IngredientID,
+				PurchaseCategoryID: item.PurchaseCategoryID,
 				Description:        item.Description,
 				Quantity:           item.Quantity,
 				UnitID:             item.UnitID,
@@ -173,6 +176,10 @@ func PurchaseOrderModelResponseToResponse(po *models.PurchaseOrderResponse) *con
 				}
 			}
 
+			if item.PurchaseCategory != nil {
+				response.Items[i].PurchaseCategory = PurchaseCategoryModelResponseToResponse(item.PurchaseCategory)
+			}
+
 			// Map unit if present
 			if item.Unit != nil {
 				response.Items[i].Unit = &contract.UnitResponse{

internal/validator/purchase_order_validator.go

@@ -2,11 +2,14 @@ package validator
 
 import (
 	"errors"
+	"strconv"
 	"strings"
 	"time"
 
 	"apskel-pos-be/internal/constants"
 	"apskel-pos-be/internal/contract"
+
+	"github.com/google/uuid"
 )
 
 type PurchaseOrderValidator interface {
@@ -26,7 +29,7 @@ func (v *PurchaseOrderValidatorImpl) ValidateCreatePurchaseOrderRequest(req *con
 		return errors.New("request body is required"), constants.MissingFieldErrorCode
 	}
 
-	if req.VendorID.String() == "" {
+	if req.VendorID == uuid.Nil {
 		return errors.New("vendor_id is required"), constants.MissingFieldErrorCode
 	}
 
@@ -178,32 +181,40 @@ func (v *PurchaseOrderValidatorImpl) ValidateListPurchaseOrdersRequest(req *cont
 }
 
 func (v *PurchaseOrderValidatorImpl) validatePurchaseOrderItem(item *contract.CreatePurchaseOrderItemRequest, index int) (error, string) {
-	if item.IngredientID.String() == "" {
+	if item.IngredientID == uuid.Nil {
-		return errors.New("items[" + string(rune(index)) + "].ingredient_id is required"), constants.MissingFieldErrorCode
+		return errors.New("items[" + strconv.Itoa(index) + "].ingredient_id is required"), constants.MissingFieldErrorCode
+	}
+
+	if item.PurchaseCategoryID == uuid.Nil {
+		return errors.New("items[" + strconv.Itoa(index) + "].purchase_category_id is required"), constants.MissingFieldErrorCode
 	}
 
 	if item.Quantity <= 0 {
-		return errors.New("items[" + string(rune(index)) + "].quantity must be greater than 0"), constants.MalformedFieldErrorCode
+		return errors.New("items[" + strconv.Itoa(index) + "].quantity must be greater than 0"), constants.MalformedFieldErrorCode
 	}
 
-	if item.UnitID.String() == "" {
+	if item.UnitID == uuid.Nil {
-		return errors.New("items[" + string(rune(index)) + "].unit_id is required"), constants.MissingFieldErrorCode
+		return errors.New("items[" + strconv.Itoa(index) + "].unit_id is required"), constants.MissingFieldErrorCode
 	}
 
 	if item.Amount < 0 {
-		return errors.New("items[" + string(rune(index)) + "].amount must be greater than or equal to 0"), constants.MalformedFieldErrorCode
+		return errors.New("items[" + strconv.Itoa(index) + "].amount must be greater than or equal to 0"), constants.MalformedFieldErrorCode
 	}
 
 	return nil, ""
 }
 
 func (v *PurchaseOrderValidatorImpl) validateUpdatePurchaseOrderItem(item *contract.UpdatePurchaseOrderItemRequest, index int) (error, string) {
+	if item.PurchaseCategoryID == nil || *item.PurchaseCategoryID == uuid.Nil {
+		return errors.New("items[" + strconv.Itoa(index) + "].purchase_category_id is required"), constants.MissingFieldErrorCode
+	}
+
 	if item.Quantity != nil && *item.Quantity <= 0 {
-		return errors.New("items[" + string(rune(index)) + "].quantity must be greater than 0"), constants.MalformedFieldErrorCode
+		return errors.New("items[" + strconv.Itoa(index) + "].quantity must be greater than 0"), constants.MalformedFieldErrorCode
 	}
 
 	if item.Amount != nil && *item.Amount < 0 {
-		return errors.New("items[" + string(rune(index)) + "].amount must be greater than or equal to 0"), constants.MalformedFieldErrorCode
+		return errors.New("items[" + strconv.Itoa(index) + "].amount must be greater than or equal to 0"), constants.MalformedFieldErrorCode
 	}
 
 	return nil, ""

internal/validator/purchase_order_validator_test.go

@@ -18,6 +18,7 @@ func validCreatePurchaseOrderRequest() *contract.CreatePurchaseOrderRequest {
 		Items: []contract.CreatePurchaseOrderItemRequest{
 			{
 				IngredientID:       uuid.New(),
+				PurchaseCategoryID: uuid.New(),
 				Quantity:           1,
 				UnitID:             uuid.New(),
 				Amount:             1000,

migrations/000078_add_purchase_category_to_purchase_order_items.down.sql

@@ -0,0 +1,5 @@
+DROP INDEX IF EXISTS idx_inventory_movements_purchase_order_item_id;
+ALTER TABLE inventory_movements DROP COLUMN IF EXISTS purchase_order_item_id;
+
+DROP INDEX IF EXISTS idx_purchase_order_items_purchase_category_id;
+ALTER TABLE purchase_order_items DROP COLUMN IF EXISTS purchase_category_id;

migrations/000078_add_purchase_category_to_purchase_order_items.up.sql

@@ -0,0 +1,11 @@
+ALTER TABLE purchase_order_items
+ADD COLUMN IF NOT EXISTS purchase_category_id UUID REFERENCES purchase_categories(id) ON DELETE RESTRICT;
+
+CREATE INDEX IF NOT EXISTS idx_purchase_order_items_purchase_category_id
+ON purchase_order_items(purchase_category_id);
+
+ALTER TABLE inventory_movements
+ADD COLUMN IF NOT EXISTS purchase_order_item_id UUID REFERENCES purchase_order_items(id) ON DELETE SET NULL;
+
+CREATE INDEX IF NOT EXISTS idx_inventory_movements_purchase_order_item_id
+ON inventory_movements(purchase_order_item_id);