added example to use ManytoOne JPA Mapping, plus entity mappings for Cart, and CartDetail to support a 'shopping' cart

Author: springframeworkguru

src/main/java/guru/springframework/domain/Cart.java

@@ -0,0 +1,69 @@
+package guru.springframework.domain;
+
+import javax.persistence.*;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Created by jt on 12/15/15.
+ */
+@Entity
+public class Cart implements DomainObject{
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Integer id;
+
+    @Version
+    private Integer version;
+
+    @OneToOne
+    private User user;
+
+    @OneToMany(cascade = CascadeType.ALL, mappedBy = "cart", orphanRemoval = true)
+    private List<CartDetail> cartDetails = new ArrayList<>();
+
+    @Override
+    public Integer getId() {
+        return id;
+    }
+
+    @Override
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public Integer getVersion() {
+        return version;
+    }
+
+    public void setVersion(Integer version) {
+        this.version = version;
+    }
+
+    public User getUser() {
+        return user;
+    }
+
+    public void setUser(User user) {
+        this.user = user;
+    }
+
+    public List<CartDetail> getCartDetails() {
+        return cartDetails;
+    }
+
+    public void setCartDetails(List<CartDetail> cartDetails) {
+        this.cartDetails = cartDetails;
+    }
+
+    public void addCartDetail(CartDetail cartDetail){
+        cartDetails.add(cartDetail);
+        cartDetail.setCart(this);
+    }
+
+    public void removeCartDetail(CartDetail cartDetail){
+        cartDetail.setCart(null);
+        this.cartDetails.remove(cartDetail);
+    }
+}

src/main/java/guru/springframework/domain/CartDetail.java

@@ -0,0 +1,57 @@
+package guru.springframework.domain;
+
+import javax.persistence.*;
+
+/**
+ * Created by jt on 12/15/15.
+ */
+@Entity
+public class CartDetail implements DomainObject {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Integer id;
+
+    @Version
+    private Integer version;
+
+    @ManyToOne
+    private Cart cart;
+
+    @OneToOne
+    private Product product;
+
+    @Override
+    public Integer getId() {
+        return id;
+    }
+
+    @Override
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public Integer getVersion() {
+        return version;
+    }
+
+    public void setVersion(Integer version) {
+        this.version = version;
+    }
+
+    public Cart getCart() {
+        return cart;
+    }
+
+    public void setCart(Cart cart) {
+        this.cart = cart;
+    }
+
+    public Product getProduct() {
+        return product;
+    }
+
+    public void setProduct(Product product) {
+        this.product = product;
+    }
+}

src/main/java/guru/springframework/domain/User.java

@@ -26,6 +26,9 @@ public class User implements DomainObject {
     @OneToOne(cascade = {CascadeType.MERGE, CascadeType.PERSIST})
     private Customer customer;
 
+    @OneToOne(cascade = CascadeType.ALL, orphanRemoval = true)
+    private Cart cart;
+
     @Override
     public Integer getId() {
         return id;
@@ -84,4 +87,12 @@ public void setCustomer(Customer customer) {
         this.customer = customer;
         customer.setUser(this);
     }
+
+    public Cart getCart() {
+        return cart;
+    }
+
+    public void setCart(Cart cart) {
+        this.cart = cart;
+    }
 }

src/test/java/guru/springframework/services/UserServiceJpaDaoImplTest.java

@@ -1,15 +1,16 @@
 package guru.springframework.services;
 
 import guru.springframework.config.JpaIntegrationConfig;
-import guru.springframework.domain.Customer;
-import guru.springframework.domain.User;
+import guru.springframework.domain.*;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.SpringApplicationConfiguration;
 import org.springframework.test.context.ActiveProfiles;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 
+import java.util.List;
+
 /**
  * Created by jt on 12/14/15.
  */
@@ -19,12 +20,18 @@
 public class UserServiceJpaDaoImplTest {
 
     private UserService userService;
+    private ProductService productService;
 
     @Autowired
     public void setUserService(UserService userService) {
         this.userService = userService;
     }
 
+    @Autowired
+    public void setProductService(ProductService productService) {
+        this.productService = productService;
+    }
+
     @Test
     public void testSaveOfUser() throws Exception {
         User user = new User();
@@ -64,4 +71,79 @@ public void testSaveOfUserWithCustomer() throws Exception {
         assert savedUser.getCustomer().getId() != null;
 
     }
+
+    @Test
+    public void testAddCartToUser() throws Exception {
+        User user = new User();
+
+        user.setUsername("someusername");
+        user.setPassword("myPassword");
+
+        user.setCart(new Cart());
+
+        User savedUser = userService.saveOrUpdate(user);
+
+        assert savedUser.getId() != null;
+        assert savedUser.getVersion() != null;
+        assert savedUser.getCart() != null;
+        assert savedUser.getCart().getId() != null;
+    }
+
+    @Test
+    public void testAddCartToUserWithCartDetails() throws Exception {
+        User user = new User();
+
+        user.setUsername("someusername");
+        user.setPassword("myPassword");
+
+        user.setCart(new Cart());
+
+        List<Product> storedProducts = (List<Product>) productService.listAll();
+
+        CartDetail cartItemOne = new CartDetail();
+        cartItemOne.setProduct(storedProducts.get(0));
+        user.getCart().addCartDetail(cartItemOne);
+
+        CartDetail cartItemTwo = new CartDetail();
+        cartItemTwo.setProduct(storedProducts.get(1));
+        user.getCart().addCartDetail(cartItemTwo);
+
+        User savedUser = userService.saveOrUpdate(user);
+
+        assert savedUser.getId() != null;
+        assert savedUser.getVersion() != null;
+        assert savedUser.getCart() != null;
+        assert savedUser.getCart().getId() != null;
+        assert savedUser.getCart().getCartDetails().size() == 2;
+    }
+
+    @Test
+    public void testAddAndRemoveCartToUserWithCartDetails() throws Exception {
+        User user = new User();
+
+        user.setUsername("someusername");
+        user.setPassword("myPassword");
+
+        user.setCart(new Cart());
+
+        List<Product> storedProducts = (List<Product>) productService.listAll();
+
+        CartDetail cartItemOne = new CartDetail();
+        cartItemOne.setProduct(storedProducts.get(0));
+        user.getCart().addCartDetail(cartItemOne);
+
+        CartDetail cartItemTwo = new CartDetail();
+        cartItemTwo.setProduct(storedProducts.get(1));
+        user.getCart().addCartDetail(cartItemTwo);
+
+        User savedUser = userService.saveOrUpdate(user);
+
+        assert savedUser.getCart().getCartDetails().size() == 2;
+
+        savedUser.getCart().removeCartDetail(savedUser.getCart().getCartDetails().get(0));
+
+        userService.saveOrUpdate(savedUser);
+
+        assert savedUser.getCart().getCartDetails().size() == 1;
+    }
 }