added connection and test

src/main/java/ntnu/idatt2016/v233/SmartMat/entity/Allergy.java → src/main/java/ntnu/idatt2016/v233/SmartMat/entity/product/Allergy.java

-package ntnu.idatt2016.v233.SmartMat.entity;
+package ntnu.idatt2016.v233.SmartMat.entity.product;
 
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import jakarta.persistence.Column;
 import jakarta.persistence.Entity;
 import jakarta.persistence.Id;
+import jakarta.persistence.ManyToMany;
 import lombok.AllArgsConstructor;
 import lombok.Builder;
 import lombok.Data;
 import lombok.NoArgsConstructor;
 
+import java.util.List;
+
 /**
  * Allergy is an entity class representing an allergy
  * 
  * @author Stian Lyng and Anders
- * @version 1.1.001
+ * @version 1.2
  * @since 19.04.2023
  *
  */
@@ -29,4 +33,8 @@ public class Allergy{
     String name;
     @Column(name = "allergy_description")
     String description;
+
+    @ManyToMany(mappedBy = "allergies")
+    @JsonIgnoreProperties({"allergies"})
+    private List<Product> products;
 }
\ No newline at end of file

src/main/java/ntnu/idatt2016/v233/SmartMat/entity/product/Category.java

 package ntnu.idatt2016.v233.SmartMat.entity.product;
 
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import jakarta.persistence.*;
 import lombok.AllArgsConstructor;
 import lombok.Builder;
@@ -21,5 +22,6 @@ public class Category {
     String description;
 
     @OneToMany(mappedBy = "category")
+    @JsonIgnoreProperties({"category"})
     private List<Product> products;
 }
\ No newline at end of file

src/main/java/ntnu/idatt2016/v233/SmartMat/entity/product/Product.java

 package ntnu.idatt2016.v233.SmartMat.entity.product;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import jakarta.persistence.*;
 import lombok.AllArgsConstructor;
@@ -7,6 +8,8 @@ import lombok.Builder;
 import lombok.Data;
 import lombok.NoArgsConstructor;
 
+import java.util.List;
+
 /**
  * Product is an entity class representing a product in the system.
  * All other info about the product is fetched from api call on fronted.
@@ -42,4 +45,13 @@ public class Product{
 
     @Column(name = "expiration_date")
     int expirationDate;
+
+    @ManyToMany
+    @JsonIgnoreProperties({"products"})
+    @JoinTable(
+            name = "product_allergy",
+            joinColumns = @JoinColumn(name = "ean"),
+            inverseJoinColumns = @JoinColumn(name = "allergy_name"))
+    List<Allergy> allergies;
+
 }

src/main/java/ntnu/idatt2016/v233/SmartMat/repository/AllergyRepository.java

 package ntnu.idatt2016.v233.SmartMat.repository;
 
-import ntnu.idatt2016.v233.SmartMat.entity.Allergy;
+import ntnu.idatt2016.v233.SmartMat.entity.product.Allergy;
 
 import org.springframework.data.jpa.repository.JpaRepository;
 
+import java.util.List;
+
 /**
  * Repository for allergies
  * 
- * @author Stian Lyng
+ * @author Stian Lyng and birk
  * @version 1.2
- * @since 19.04.2023
+ * @since 21.04.2023
  */
 public interface AllergyRepository extends JpaRepository<Allergy, String> {
-
+    /**
+     * Finds all allergies by product id
+     * @param id the id of the product
+     * @return list of allergies
+     */
+    List<Allergy> findAllByProductsEan(long id);
     }

src/test/java/ntnu/idatt2016/v233/SmartMat/repository/AllergyRepositoryTest.java

 package ntnu.idatt2016.v233.SmartMat.repository;
 
-import ntnu.idatt2016.v233.SmartMat.entity.Allergy;
+import ntnu.idatt2016.v233.SmartMat.entity.product.Allergy;
+import ntnu.idatt2016.v233.SmartMat.entity.product.Product;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
@@ -17,6 +18,9 @@ class AllergyRepositoryTest {
     @Autowired
     private AllergyRepository allergyRepository;
 
+    @Autowired
+    private ProductRepository productRepository;
+
     @Test
     @DisplayName("Test findByName")
     void testFindByName() {
@@ -85,4 +89,33 @@ class AllergyRepositoryTest {
         Assertions.assertTrue(allergies.contains(allergy1));
         Assertions.assertTrue(allergies.contains(allergy2));
     }
+
+    @Test
+    void findByProductId() {
+        Allergy allergy = Allergy.builder()
+                .name("testName")
+                .description("testDescription")
+                .build();
+
+        Product product = Product.builder()
+                .ean(1234567890123L)
+                .name("Test Product")
+                .description("This is a test product")
+                .allergies(List.of(allergy))
+                .build();
+
+
+
+        allergyRepository.save(allergy);
+
+        productRepository.save(product);
+
+        Assertions.assertNotNull(allergyRepository.findAllByProductsEan(product.getEan()));
+
+        allergyRepository.findAllByProductsEan(product.getEan()).forEach(allergy1 -> {
+            Assertions.assertNull(allergy1.getProducts());
+        });
+
+
+    }
 }