From e49a7b0bb47248cd7bb18fed310e7d548784ddcc Mon Sep 17 00:00:00 2001
From: MartinBraquet <martin.braquet@gmail.com>
Date: Fri, 24 Oct 2025 02:09:46 +0200
Subject: [PATCH] Add backend support for setting compatibility answers

---
 backend/api/src/app.ts                        |  4 ++-
 backend/api/src/set-compatibility-answer.ts   | 34 +++++++++++++++++++
 common/src/api/schema.ts                      | 15 ++++++++
 .../answer-compatibility-question-content.tsx | 15 ++++----
 4 files changed, 61 insertions(+), 7 deletions(-)
 create mode 100644 backend/api/src/set-compatibility-answer.ts

diff --git a/backend/api/src/app.ts b/backend/api/src/app.ts
index c63ccb8..2f5f373 100644
--- a/backend/api/src/app.ts
+++ b/backend/api/src/app.ts
@@ -12,6 +12,7 @@ import {blockUser, unblockUser} from './block-user'
 import {getCompatibleProfilesHandler} from './compatible-profiles'
 import {createComment} from './create-comment'
 import {createCompatibilityQuestion} from './create-compatibility-question'
+import {setCompatibilityAnswer} from './set-compatibility-answer'
 import {createProfile} from './create-profile'
 import {createUser} from './create-user'
 import {getCompatibilityQuestions} from './get-compatibililty-questions'
@@ -170,6 +171,7 @@ const handlers: { [k in APIPath]: APIHandler<k> } = {
   'create-comment': createComment,
   'hide-comment': hideComment,
   'create-compatibility-question': createCompatibilityQuestion,
+  'set-compatibility-answer': setCompatibilityAnswer,
   'create-vote': createVote,
   'vote': vote,
   'contact': contact,
@@ -188,7 +190,7 @@ const handlers: { [k in APIPath]: APIHandler<k> } = {
   'set-last-online-time': setLastOnlineTime,
   'save-subscription': saveSubscription,
   'create-bookmarked-search': createBookmarkedSearch,
-    'delete-bookmarked-search': deleteBookmarkedSearch,
+  'delete-bookmarked-search': deleteBookmarkedSearch,
 }
 
 Object.entries(handlers).forEach(([path, handler]) => {
diff --git a/backend/api/src/set-compatibility-answer.ts b/backend/api/src/set-compatibility-answer.ts
new file mode 100644
index 0000000..156b209
--- /dev/null
+++ b/backend/api/src/set-compatibility-answer.ts
@@ -0,0 +1,34 @@
+import {APIHandler} from './helpers/endpoint'
+import {createSupabaseDirectClient} from 'shared/supabase/init'
+import {Row} from 'common/supabase/utils'
+
+export const setCompatibilityAnswer: APIHandler<'set-compatibility-answer'> = async (
+  {questionId, multipleChoice, prefChoices, importance, explanation},
+  auth
+) => {
+  const pg = createSupabaseDirectClient()
+
+  const result = await pg.one<Row<'compatibility_answers'>>({
+    text: `
+        INSERT INTO compatibility_answers
+        (creator_id, question_id, multiple_choice, pref_choices, importance, explanation)
+        VALUES ($1, $2, $3, $4, $5, $6)
+        ON CONFLICT (question_id, creator_id)
+            DO UPDATE SET multiple_choice = EXCLUDED.multiple_choice,
+                          pref_choices    = EXCLUDED.pref_choices,
+                          importance      = EXCLUDED.importance,
+                          explanation     = EXCLUDED.explanation
+        RETURNING *
+    `,
+    values: [
+      auth.uid,
+      questionId,
+      multipleChoice,
+      prefChoices,
+      importance,
+      explanation ?? null,
+    ],
+  })
+
+  return result
+}
diff --git a/common/src/api/schema.ts b/common/src/api/schema.ts
index ecb8ae4..f0a47d2 100644
--- a/common/src/api/schema.ts
+++ b/common/src/api/schema.ts
@@ -515,6 +515,21 @@ export const API = (_apiTypeCheck = {
       options: z.record(z.string(), z.number()),
     }),
   },
+  'set-compatibility-answer': {
+    method: 'POST',
+    authed: true,
+    rateLimited: true,
+    returns: {} as Row<'compatibility_answers'>,
+    props: z
+      .object({
+        questionId: z.number(),
+        multipleChoice: z.number(),
+        prefChoices: z.array(z.number()),
+        importance: z.number(),
+        explanation: z.string().nullable().optional(),
+      })
+      .strict(),
+  },
   'create-vote': {
     method: 'POST',
     authed: true,
diff --git a/web/components/answers/answer-compatibility-question-content.tsx b/web/components/answers/answer-compatibility-question-content.tsx
index 1c1e61a..9a71ffb 100644
--- a/web/components/answers/answer-compatibility-question-content.tsx
+++ b/web/components/answers/answer-compatibility-question-content.tsx
@@ -16,6 +16,7 @@ import {Tooltip} from 'web/components/widgets/tooltip'
 import {QuestionWithCountType} from 'web/hooks/use-questions'
 import {track} from 'web/lib/service/analytics'
 import {db} from 'web/lib/supabase/db'
+import {api} from 'web/lib/api'
 import {filterKeys} from '../questions-form'
 import toast from "react-hot-toast";
 
@@ -58,18 +59,20 @@ export const submitCompatibilityAnswer = async (
   } as CompatibilityAnswerSubmitType
 
   try {
-    await run(
-      db.from('compatibility_answers').upsert(input, {
-        onConflict: 'question_id,creator_id',
-      })
-    );
+    await api('set-compatibility-answer', {
+      questionId: input.question_id,
+      multipleChoice: input.multiple_choice,
+      prefChoices: input.pref_choices ?? [],
+      importance: input.importance,
+      explanation: input.explanation ?? null,
+    })
 
     // Track only if upsert succeeds
     track('answer compatibility question', {
       ...newAnswer,
     });
   } catch (error) {
-    console.error('Failed to upsert compatibility_answers:', error);
+    console.error('Failed to set compatibility answer:', error);
     toast.error('Error submitting. Try again?')
   }
 }