start stubbing out endpoints

app/models.py

@@ -131,35 +131,41 @@ class Topics(Model):
             order_clause = 'ORDER BY threads.is_stickied DESC, latest_post_created_at DESC'
 
         q = """
-            SELECT
-                threads.id, threads.title, threads.slug, threads.created_at, threads.is_locked, threads.is_stickied,
-                users.username AS started_by,
-                users.display_name AS started_by_display_name,
-                u.username AS latest_post_username,
-                u.display_name AS latest_post_display_name,
-                ph.content AS latest_post_content,
-                posts.created_at AS latest_post_created_at,
-                posts.id AS latest_post_id
-            FROM
-                threads
-            JOIN users ON users.id = threads.user_id
-            JOIN (
+            WITH latest_posts AS (
                 SELECT
-                    posts.thread_id,
-                    posts.id,
-                    posts.user_id,
-                    posts.created_at,
-                    posts.current_revision_id,
-                    ROW_NUMBER() OVER (PARTITION BY posts.thread_id ORDER BY posts.created_at DESC) AS rn
-            FROM
-                posts
-            ) posts ON posts.thread_id = threads.id AND posts.rn = 1
-            JOIN
-                post_history ph ON ph.id = posts.current_revision_id
-            JOIN
-                users u ON u.id = posts.user_id
-            WHERE
-            threads.topic_id = ?
+                    thread_id,
+                    id AS latest_post_id,
+                    user_id AS latest_post_user_id,
+                    created_at AS latest_post_created_at,
+                    ROW_NUMBER() OVER (PARTITION BY thread_id ORDER BY created_at DESC) AS rn
+                FROM posts
+            ),
+            post_counts AS (
+                SELECT
+                    thread_id,
+                    COUNT(*) AS posts_count
+                FROM posts
+                GROUP BY thread_id
+            )
+            SELECT
+                threads.title,
+                threads.slug,
+                threads.created_at,
+                threads.is_locked,
+                threads.is_stickied,
+                starter.username AS started_by,
+                starter.display_name AS started_by_display_name,
+                latest_poster.username AS latest_post_username,
+                latest_poster.display_name AS latest_post_display_name,
+                latest_posts.latest_post_created_at,
+                latest_posts.latest_post_id,
+                COALESCE(post_counts.posts_count, 0) AS posts_count
+            FROM threads
+            JOIN users AS starter ON starter.id = threads.user_id
+            LEFT JOIN latest_posts ON latest_posts.thread_id = threads.id AND latest_posts.rn = 1
+            LEFT JOIN users AS latest_poster ON latest_poster.id = latest_posts.latest_post_user_id
+            LEFT JOIN post_counts ON post_counts.thread_id = threads.id
+            WHERE threads.topic_id = ?
         """ + order_clause + ' LIMIT ? OFFSET ?'
 
         return db.query(q, self.id, per_page, (page - 1) * per_page)