Fix playlist not updating properly

db.go

 }
 
 func (db *DB) UpdatePlaylistBySection(sectionName string, tracks []string) (bool, error) {
-	tracksJson, err := json.Marshal(tracks)
+	tracksJSON, err := json.Marshal(tracks)
 	if err != nil {
 		return false, err
 	}
 	query := `
 	INSERT INTO public.round_playlist
-	SELECT r.id, ARRAY(SELECT e::text FROM json_array_elements($2::json) e)
+	SELECT r.id, ARRAY(SELECT e::text FROM json_array_elements_text($2::json) e)
 	FROM public.round r 
 	WHERE r.section = $1
 	ON CONFLICT (round_id) DO UPDATE SET tracks = EXCLUDED.tracks`
 
-	res, err := db.database.Exec(query, sectionName, tracksJson)
+	res, err := db.database.Exec(query, sectionName, tracksJSON)
 
 	if err != nil {
 		return false, err

db_test.go

 	if len(playlistEntries) != 4 {
 		t.Error("Should have found 4 playlistEntries, got", len(playlistEntries))
 	}
+	if playlistEntries[0] != "ID1" {
+		t.Error("Should have been ID1, got ", playlistEntries[0])
+	}
+	if playlistEntries[1] != "ID2" {
+		t.Error("Should have been ID2, got ", playlistEntries[1])
+	}
+	if playlistEntries[2] != "ID3" {
+		t.Error("Should have been ID3, got ", playlistEntries[2])
+	}
+	if playlistEntries[3] != "ID4" {
+		t.Error("Should have been ID4, got ", playlistEntries[3])
+	}
 }
 func TestUpdatePlaylistBySectionUnknownSection(t *testing.T) {
 	initTestCase(t)