Don't show completely unrelated chapter suggestions

Chapter suggestions should be at least slightly related to what the user
has already typed.
This change stops the server from sending suggestions that postgresql
deems to be "less than 10% similar"

Also modified tests to reflect this change.

src/routes/getChapterNames.ts

@@ -27,10 +27,11 @@ export async function getChapterNames(req: Request, res: Response): Promise<Resp
                 FROM "videoInfo"
                 WHERE "channelID" = ?
             ) AND "description" != ''
+              AND similarity("description", ?) >= 0.1
             GROUP BY "description"
             ORDER BY SUM("votes"), similarity("description", ?) DESC
             LIMIT 5;`
-        , [channelID, description]) as { description: string }[];
+        , [channelID, description, description]) as { description: string }[];
 
         if (descriptions?.length > 0) {
             return res.status(200).json(descriptions.map(d => ({

test/cases/getChapterNames.ts

@@ -16,17 +16,18 @@ describe("getChapterNames", function () {
         "Weird name",
         "A different one",
         "Something else",
+        "Weirder name",
     ];
 
-    const nameSearch = (query: string, expected: string): Promise<void> => {
+    const nameSearch = (query: string, expected: string | null, expectedResults: number): Promise<void> => {
         const expectedData = [{
             description: expected
         }];
         return client.get(`${endpoint}?description=${query}&channelID=${chapterChannelID}`)
             .then(res => {
-                assert.strictEqual(res.status, 200);
-                assert.strictEqual(res.data.length, chapterNames.length);
-                assert.ok(partialDeepEquals(res.data, expectedData));
+                assert.strictEqual(res.status, expectedResults == 0 ? 404 : 200);
+                assert.strictEqual(res.data.length, expectedResults);
+                if (expected != null) assert.ok(partialDeepEquals(res.data, expectedData));
             });
     };
 
@@ -35,11 +36,13 @@ describe("getChapterNames", function () {
         await insertChapter(db, chapterNames[0], { videoID: chapterNamesVid1, startTime: 60, endTime: 80 });
         await insertChapter(db, chapterNames[1], { videoID: chapterNamesVid1, startTime: 70, endTime: 75 });
         await insertChapter(db, chapterNames[2], { videoID: chapterNamesVid1, startTime: 71, endTime: 76 });
+        await insertChapter(db, chapterNames[3], { videoID: chapterNamesVid1, startTime: 72, endTime: 77 });
 
         await insertVideoInfo(db, chapterNamesVid1, chapterChannelID);
     });
 
-    it("Search for 'weird'", () => nameSearch("weird", chapterNames[0]));
-    it("Search for 'different'", () => nameSearch("different", chapterNames[1]));
-    it("Search for 'something'", () => nameSearch("something", chapterNames[2]));
-});
+    it("Search for 'weird' (2 results)", () => nameSearch("weird", chapterNames[0], 2));
+    it("Search for 'different' (1 result)", () => nameSearch("different", chapterNames[1], 1));
+    it("Search for 'something' (1 result)", () => nameSearch("something", chapterNames[2], 1));
+    it("Search for 'unrelated' (0 result)", () => nameSearch("unrelated", null, 0));
+});