CartItem implementation finished.

Author: manirDev

src/main/java/com/manir/springbootecommercerestapi/controller/ShoppingCartController.java

@@ -33,4 +33,22 @@ public ResponseEntity<CartItemDto> addCartItem(@PathVariable Long customerId,
 
         return new ResponseEntity<>(responseCartItem, HttpStatus.CREATED);
     }
+
+    //update item quantity api
+    @PutMapping("/updateItemQuantity/{customerId}/{productId}/{quantity}")
+    public ResponseEntity<CartItemDto> updateItemQuantity(@PathVariable Long customerId,
+                                                          @PathVariable Long productId,
+                                                          @PathVariable Integer quantity){
+
+        CartItemDto responseCartItem = shoppingCartService.updateItemQuantity(customerId, productId, quantity);
+
+        return  new ResponseEntity<>(responseCartItem, HttpStatus.OK);
+    }
+
+    //delete item product api
+    @DeleteMapping("/deleteItemProduct/{customerId}/{productId}")
+    public ResponseEntity<String> deleteItemProduct(@PathVariable Long customerId, @PathVariable Long productId){
+        shoppingCartService.deleteItemProduct(customerId, productId);
+        return ResponseEntity.ok("Product deleted successfully from cart item");
+    }
 }

src/main/java/com/manir/springbootecommercerestapi/repository/CartItemRepository.java

@@ -2,6 +2,8 @@
 
 import com.manir.springbootecommercerestapi.model.CartItem;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
+import org.springframework.data.jpa.repository.Query;
 
 import java.util.List;
 
@@ -12,4 +14,11 @@ public interface CartItemRepository extends JpaRepository<CartItem, Long> {
     //CartItem findByCustomerAndProduct(Customer customer, Product product);
     CartItem findByCustomerIdAndProductId(Long customerId, Long productId);
 
+    @Query("UPDATE CartItem c SET c.quantity = ?3 WHERE c.product.id = ?2 AND c.customer.id = ?1")
+    void updateItemQuantity(Long customerId, Long productId, Integer quantity);
+
+    @Query("DELETE FROM CartItem c WHERE c.customer.id = ?1 AND c.product.id = ?2")
+    @Modifying
+    void deleteByCustomerIdAndProductId(Long customerId, Long productId);
+
 }

src/main/java/com/manir/springbootecommercerestapi/service/Impl/ShoppingCartServiceImpl.java

@@ -1,6 +1,7 @@
 package com.manir.springbootecommercerestapi.service.Impl;
 
 import com.manir.springbootecommercerestapi.dto.CartItemDto;
+import com.manir.springbootecommercerestapi.exception.EcommerceApiException;
 import com.manir.springbootecommercerestapi.exception.ResourceNotFoundException;
 import com.manir.springbootecommercerestapi.model.CartItem;
 import com.manir.springbootecommercerestapi.model.Customer;
@@ -11,14 +12,17 @@
 import com.manir.springbootecommercerestapi.service.ShoppingCartService;
 import lombok.extern.slf4j.Slf4j;
 import org.modelmapper.ModelMapper;
+import org.springframework.http.HttpStatus;
 import org.springframework.stereotype.Service;
 
 import javax.annotation.Resource;
+import javax.transaction.Transactional;
 import java.util.List;
 import java.util.stream.Collectors;
 
 @Service
 @Slf4j
+
 public class ShoppingCartServiceImpl implements ShoppingCartService {
 
     @Resource
@@ -32,7 +36,13 @@ public class ShoppingCartServiceImpl implements ShoppingCartService {
 
     @Override
     public List<CartItemDto> findByCustomerId(Long customerId) {
+
         List<CartItem> cartItems = cartItemRepository.findByCustomerId(customerId);
+
+        if (cartItems.size() == 0){
+            throw new EcommerceApiException("Customer has no product in cart item", HttpStatus.BAD_REQUEST);
+        }
+
         List<CartItemDto> cartItemDtoList = cartItems.stream()
                                                      .map(cartItem -> mapToDto(cartItem))
                                                      .collect(Collectors.toList());
@@ -49,7 +59,7 @@ public CartItemDto addCartItem(Long customerId, Long productId, Integer quantity
                                               );
         Product product = productRepository.findById(productId)
                                            .orElseThrow(
-                                                    () -> new ResourceNotFoundException("Customer", customerId)
+                                                    () -> new ResourceNotFoundException("Product", productId)
                                            );
 
         CartItem cartItem = cartItemRepository.findByCustomerIdAndProductId(customerId, productId);
@@ -68,6 +78,47 @@ public CartItemDto addCartItem(Long customerId, Long productId, Integer quantity
         return mapToDto(addedCartItem);
     }
 
+    @Override
+    public CartItemDto updateItemQuantity(Long customerId, Long productId, Integer quantity) {
+
+        Customer customer = customerRepository.findById(customerId)
+                .orElseThrow(
+                        () -> new ResourceNotFoundException("Customer", customerId)
+                );
+        Product product = productRepository.findById(productId)
+                .orElseThrow(
+                        () -> new ResourceNotFoundException("Product", productId)
+                );
+
+        CartItem cartItem = cartItemRepository.findByCustomerIdAndProductId(customerId, productId);
+        if (!cartItem.getCustomer().getId().equals(customer.getId()) || !cartItem.getProduct().getId().equals(product.getId())){
+            throw new EcommerceApiException(" this cart item does not belong to Customer or Product ", HttpStatus.BAD_REQUEST);
+        }
+        cartItem.setQuantity(quantity);
+        CartItem updatedItemQuantity = cartItemRepository.save(cartItem);
+        return mapToDto(updatedItemQuantity);
+    }
+
+    @Override
+    @Transactional
+    public void deleteItemProduct(Long customerId, Long productId) {
+        Customer customer = customerRepository.findById(customerId)
+                .orElseThrow(
+                        () -> new ResourceNotFoundException("Customer", customerId)
+                );
+        Product product = productRepository.findById(productId)
+                .orElseThrow(
+                        () -> new ResourceNotFoundException("Product", productId)
+                );
+        CartItem cartItem = cartItemRepository.findByCustomerIdAndProductId(customerId, productId);
+        if (cartItem != null){
+            cartItemRepository.deleteByCustomerIdAndProductId(customerId, productId);
+        }
+        if (!cartItem.getCustomer().getId().equals(customer.getId()) || !cartItem.getProduct().getId().equals(product.getId())){
+            throw new EcommerceApiException(" this cart item does not belong to Customer or Product ", HttpStatus.BAD_REQUEST);
+        }
+    }
+
     //map to dto
     private CartItemDto mapToDto(CartItem cartItem){
         CartItemDto cartItemDto = modelMapper.map(cartItem, CartItemDto.class);

src/main/java/com/manir/springbootecommercerestapi/service/ShoppingCartService.java

@@ -9,4 +9,8 @@ public interface ShoppingCartService {
     List<CartItemDto> findByCustomerId(Long customerId);
 
     CartItemDto addCartItem(Long customerId, Long productId, Integer quantity);
+
+    CartItemDto updateItemQuantity(Long customerId, Long productId, Integer quantity);
+
+    void deleteItemProduct(Long customerId, Long productId);
 }