feature #4: create function for article

implement generate_version_number()

resources/functions/article/find_last_article_by_version_id.sql

@@ -0,0 +1,20 @@
+create or replace function find_last_article_by_version_id(in version_id uuid, out resource json) language plpgsql as
+$$
+declare
+    _version_id alias for version_id;
+begin
+    select to_json(t)
+    from (
+        select
+            a.*,
+            find_citizen_by_id(a.created_by_id) as created_by
+        into resource
+        from article as a
+        where a.version_id = _version_id
+        order by a.version_number desc
+        limit 1
+    ) as t;
+end;
+$$;
+
+-- drop function if exists find_last_article_by_version_id(uuid, inout json);