From cdd6b8700effa8058e530dbf3360a6fc740ce969 Mon Sep 17 00:00:00 2001
From: "Krzysztof G." <60067306+gikf@users.noreply.github.com>
Date: Tue, 14 Jan 2025 21:10:04 +0100
Subject: [PATCH] feat(tools): verify answers uniqueness (#58071)

Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
---
 curriculum/schema/challenge-schema.js | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/curriculum/schema/challenge-schema.js b/curriculum/schema/challenge-schema.js
index dc2a1a12712..9372e9d9f87 100644
--- a/curriculum/schema/challenge-schema.js
+++ b/curriculum/schema/challenge-schema.js
@@ -91,7 +91,8 @@ const questionJoi = Joi.object().keys({
         feedback: Joi.string().allow(null)
       })
     )
-    .required(),
+    .required()
+    .unique('answer'),
   solution: Joi.number().required()
 });
 
@@ -101,9 +102,13 @@ const quizJoi = Joi.object().keys({
       Joi.object().keys({
         text: Joi.string().required(),
         distractors: Joi.array()
-          .items(Joi.string().required())
+          .items(
+            Joi.valid(Joi.ref('...answer')).forbidden(),
+            Joi.string().required()
+          )
           .length(3)
-          .required(),
+          .required()
+          .unique(),
         answer: Joi.string().required()
       })
     )