Count items in database as much as possible (#344)

* Count items in database as much as possible

* Fix the tests

* Remove two useless queries

* Run pragma directive before each sqlite connection

* Pragma for tests too

* Remove debug messages

src/routes/posts.rs

@@ -66,8 +66,8 @@ pub fn details(blog: String, slug: String, conn: DbConn, user: Option<User>, res
             Tag::for_post(&*conn, post.id),
             comments.into_iter().filter(|c| c.in_response_to_id.is_none()).collect::<Vec<Comment>>(),
             previous,
-            post.get_likes(&*conn).len(),
-            post.get_reshares(&*conn).len(),
+            post.count_likes(&*conn),
+            post.count_reshares(&*conn),
             user.clone().map(|u| u.has_liked(&*conn, &post)).unwrap_or(false),
             user.clone().map(|u| u.has_reshared(&*conn, &post)).unwrap_or(false),
             user.map(|u| u.is_following(&*conn, post.get_authors(&*conn)[0].id)).unwrap_or(false),