fix: iteration logic bug

public/openapi/write/topics/tid/thumbs.yaml

@@ -22,8 +22,18 @@ get:
               status:
                 $ref: ../../../components/schemas/Status.yaml#/Status
               response:
-                type: object
+                type: array
-                properties: {}
+                description: A list of the topic thumbnails that still remain
+                items:
+                  type: object
+                  properties:
+                    id:
+                      type: string
+                    name:
+                      type: string
+                    url:
+                      type: string
+                      description: Path to a topic thumbnail
 post:
   tags:
     - topics
@@ -141,6 +151,10 @@ delete:
                 items:
                   type: object
                   properties:
+                    id:
+                      type: string
+                    name:
+                      type: string
                     url:
                       type: string
                       description: Path to a topic thumbnail

src/topics/thumbs.js

@@ -29,7 +29,7 @@ Thumbs.get = async function (tids) {
 
 	const sets = tids.map(tid => `${validator.isUUID(String(tid)) ? 'draft' : 'topic'}:${tid}:thumbs`);
 	const thumbs = await db.getSortedSetsMembers(sets);
-	let response = thumbs.map(thumbSet => thumbSet.map((thumb, idx) => ({
+	let response = thumbs.map((thumbSet, idx) => thumbSet.map(thumb => ({
 		id: tids[idx],
 		name: path.basename(thumb),
 		url: path.join(nconf.get('upload_url'), thumb),