Fixes for tags

- process_hive_post_operation will return post_category,
- post_category will be used to set initial post tag,
- post_category a parent category if parent_author exists
  or parent_permlingif parent_author does not exists.

hive/db/schema.py

@@ -421,7 +421,7 @@ def setup(db):
             in _date hive_posts.created_at%TYPE,
             in _community_support_start_date hive_posts.created_at%TYPE)
           RETURNS TABLE (id hive_posts.id%TYPE, author_id hive_posts.author_id%TYPE, permlink_id hive_posts.permlink_id%TYPE,
-                         parent_id hive_posts.parent_id%TYPE, community_id hive_posts.community_id%TYPE,
+                         post_category hive_category_data.category%TYPE, parent_id hive_posts.parent_id%TYPE, community_id hive_posts.community_id%TYPE,
                          is_valid hive_posts.is_valid%TYPE, is_muted hive_posts.is_muted%TYPE, depth hive_posts.depth%TYPE,
                          is_edited boolean)
           LANGUAGE plpgsql
@@ -482,7 +482,7 @@ def setup(db):
                             END
                            )
 
-            RETURNING hp.id, hp.author_id, hp.permlink_id, hp.parent_id, hp.community_id, hp.is_valid, hp.is_muted, hp.depth, (hp.updated_at > hp.created_at) as is_edited
+            RETURNING hp.id, hp.author_id, hp.permlink_id, (SELECT hcd.category FROM hive_category_data hcd WHERE hcd.id = hp.category_id) as post_category, hp.parent_id, hp.community_id, hp.is_valid, hp.is_muted, hp.depth, (hp.updated_at > hp.created_at) as is_edited
           ;
           ELSE
             INSERT INTO hive_category_data
@@ -530,7 +530,7 @@ def setup(db):
                             END
                            )
 
-            RETURNING hp.id, hp.author_id, hp.permlink_id, hp.parent_id, hp.community_id, hp.is_valid, hp.is_muted, hp.depth, (hp.updated_at > hp.created_at) as is_edited
+            RETURNING hp.id, hp.author_id, hp.permlink_id, _parent_permlink as post_category, hp.parent_id, hp.community_id, hp.is_valid, hp.is_muted, hp.depth, (hp.updated_at > hp.created_at) as is_edited
             ;
           END IF;
           END

hive/indexer/posts.py

@@ -94,7 +94,7 @@ class Posts:
         """Register new/edited/undeleted posts; insert into feed cache."""
 
         sql = """
-            SELECT id, author_id, permlink_id, parent_id, community_id, is_valid, is_muted, depth, is_edited
+            SELECT id, author_id, permlink_id, post_category, parent_id, community_id, is_valid, is_muted, depth, is_edited
             FROM process_hive_post_operation((:author)::varchar, (:permlink)::varchar, (:parent_author)::varchar, (:parent_permlink)::varchar, (:date)::timestamp, (:community_support_start_date)::timestamp);
             """
 
@@ -124,7 +124,7 @@ class Posts:
         except Exception:
             pass
 
-        tags = [op['parent_permlink']]
+        tags = [result['post_category']]
         if md and 'tags' in md and isinstance(md['tags'], list):
             tags = tags + md['tags']
         tags = map(lambda tag: (str(tag) or '').strip('# ').lower()[:32], tags)