Made delete() return a deepcopy of recipe.

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

@@ -75,11 +75,28 @@ public class RecipeService {
         return Optional.of(saveWithDependencies(recipe));
     }
 
-    public boolean delete(Long id) {
+    /**
+     * Deletes a recipe by id and returns the deleted object.
+     * @param id id of the recipe to delete.
+     * @return The deleted recipe (deep copy).
+     */
+    public Optional<Recipe> delete(Long id) {
         // TODO: Propagate deletion to ingredients.
-        if (!recipeRepository.existsById(id)) return false;
+        Optional<Recipe> recipe = recipeRepository.findById(id);
+        if (recipe.isEmpty()) return Optional.empty();
+
+        // Make deep copy before removal. ( Had some lazy loading issues otherwise )
+        Recipe r = recipe.get();
+        Recipe copy = new Recipe(
+                r.getId(),
+                r.getName(),
+                r.getLocale(),
+                List.copyOf(r.getIngredients()),
+                List.copyOf(r.getPreparationSteps())
+        );
+
         recipeRepository.deleteById(id);
-        return true;
+        return Optional.of(copy);
     }
 
     private Recipe saveWithDependencies(Recipe recipe) {