add a sort order to topics for the future

apps/topics.lua

@@ -40,6 +40,8 @@ app:get("all_topics", "", function(self)
       ) threads ON threads.topic_id = topics.id AND threads.rn = 1
     LEFT JOIN
       users on users.id = threads.user_id
+    ORDER BY
+      topics.sort_order ASC
   ]])
   self.me = util.get_logged_in_user_or_transient(self)
   return {render = "topics.topics"}
@@ -68,10 +70,12 @@ app:post("topic_create", "/create", function(self)
   local time = os.time()
   local slug = lapis_util.slugify(topic_name) .. "-" .. time
 
+  local topic_count = Topics:count()
   local topic = Topics:create({
     name = topic_name,
     description = topic_description,
     slug = slug,
+    sort_order = topic_count + 1,
   })
   
   util.inject_infobox(self, "Topic created.")

migrations.lua

@@ -57,5 +57,10 @@ return {
     db.query('DROP INDEX "idx_users_avatar"')
     schema.drop_column("users", "avatar_id")
     schema.add_column("users", "avatar_id", "REFERENCES avatars(id) DEFAULT 1")
+  end,
+  
+  [8] = function ()
+    schema.add_column("topics", "sort_order", types.integer{default = 0})
+    db.query("UPDATE topics SET sort_order = (SELECT COUNT(*) FROM topics t2 WHERE t2.ROWID <= topics.ROWID)")
   end
 }