Fixed error when adding ingredient

commons/src/main/java/commons/Ingredient.java

@@ -20,13 +20,12 @@ public class Ingredient {
 
     @Id
     @GeneratedValue(strategy = GenerationType.AUTO)
-    public long id;
+    public Long id;
 
     // FIXME Dec 22 2025::temporarily made this not a unique constraint because of weird JPA behaviour
     @Column(name = "name", nullable = false, unique = false)
     public String name;
 
-
     @Column(name = "protein", nullable = false)
     public double proteinPer100g;
 
@@ -70,7 +69,7 @@ public class Ingredient {
                 + fatPer100g * KCAL_PER_GRAM_FAT;
     }
 
-    public void setId(long id) {
+    public void setId(Long id) {
         this.id = id;
     }
 
@@ -86,7 +85,7 @@ public class Ingredient {
         return carbsPer100g;
     }
 
-    public long getId() {
+    public Long getId() {
         return id;
     }
 

server/src/main/java/server/service/RecipeService.java

@@ -1,5 +1,6 @@
 package server.service;
 
+import commons.Ingredient;
 import commons.Recipe;
 import org.springframework.data.domain.PageRequest;
 import org.springframework.stereotype.Service;
@@ -88,8 +89,11 @@ public class RecipeService {
                         recipeIngredient.setIngredient(
                                 ingredientRepository
                                         .findByName(recipeIngredient.getIngredient().name)
-                                        .orElseGet(() -> ingredientRepository.save(recipeIngredient.getIngredient())
-                                        ))
+                                        .orElseGet(() -> {
+                                            Ingredient i = recipeIngredient.getIngredient();
+                                            i.setId(null);
+                                            return ingredientRepository.save(i);
+                                        }))
                 );
         recipeIngredientRepository.saveAll(recipe.getIngredients());
         return recipeRepository.save(recipe);