fix: correct deletion method implementation

reference: https://stackoverflow.com/questions/75912878/could-not-write-json-failed-to-lazily-initialize-a-collection-when-returning-an

server/src/main/java/server/api/RecipeController.java

@@ -115,17 +115,16 @@ public class RecipeController {
      *     Deletes a recipe identified by its <code>id</code>.
      * </p>
      * @param id The id of the recipe to be deleted.
-     * @return 200 OK with the recipe that was deleted; or 400 Bad Request if the recipe doesn't exist.
+     * @return 200 OK with true; or 400 Bad Request if the recipe doesn't exist.
      */
     @DeleteMapping("/recipe/{id}")
-    public ResponseEntity<Recipe> deleteRecipe(@PathVariable Long id) {
+    public ResponseEntity<Boolean> deleteRecipe(@PathVariable Long id) {
         if (!recipeRepository.existsById(id)) {
             return ResponseEntity.badRequest().build();
         }
-        Recipe removedRecipe = recipeRepository.findById(id).get();
-        recipeRepository.delete(removedRecipe);
+        recipeRepository.deleteById(id);
 
         // TODO: Send WS update to propagate deletion
-        return ResponseEntity.ok(removedRecipe);
+        return ResponseEntity.ok(true);
     }
 }