Adding post editing.

- Adding post editing. Fixes #23
- Making SQL versions of comment and post fetching. Fixes #21
- Starting to add forum categories. #17

2 files changed, 73 insertions, 0 deletions

diff --git a/server/migrations/2019-03-30-212058_create_post_view/down.sql b/server/migrations/2019-03-30-212058_create_post_view/down.sql
new file mode 100644
index 00000000..37c54d91
--- /dev/null
+++ b/server/migrations/2019-03-30-212058_create_post_view/down.sql
@@ -0,0 +1,2 @@
+drop view post_view;
+drop function hot_rank;
diff --git a/server/migrations/2019-03-30-212058_create_post_view/up.sql b/server/migrations/2019-03-30-212058_create_post_view/up.sql
new file mode 100644
index 00000000..c1848631
--- /dev/null
+++ b/server/migrations/2019-03-30-212058_create_post_view/up.sql
@@ -0,0 +1,71 @@
+-- Rank = ScaleFactor * sign(Score) * log(1 + abs(Score)) / (Time + 2)^Gravity
+create or replace function hot_rank(
+  score numeric,
+  published timestamp without time zone)
+returns integer as $$
+begin
+  -- hours_diff:=EXTRACT(EPOCH FROM (timezone('utc',now()) - published))/3600
+  return 10000*sign(score)*log(1 + abs(score)) / power(((EXTRACT(EPOCH FROM (timezone('utc',now()) - published))/3600) + 2), 1.8);
+end; $$
+LANGUAGE plpgsql;
+
+create view post_view as
+with all_post as
+(
+  select        
+  p.*,
+  (select name from user_ where p.creator_id = user_.id) creator_name,
+  (select name from community where p.community_id = community.id) as community_name,
+  (select count(*) from comment where comment.post_id = p.id) as number_of_comments,
+  coalesce(sum(pl.score), 0) as score,
+  count (case when pl.score = 1 then 1 else null end) as upvotes,
+  count (case when pl.score = -1 then 1 else null end) as downvotes,
+  hot_rank(coalesce(sum(pl.score) , 0), p.published) as hot_rank
+  from post p
+  left join post_like pl on p.id = pl.post_id
+  group by p.id
+)
+
+select
+ap.*,
+u.id as user_id,
+coalesce(pl.score, 0) as my_vote
+from user_ u
+cross join all_post ap
+left join post_like pl on u.id = pl.user_id and ap.id = pl.post_id
+
+union all
+
+select 
+ap.*,
+null as user_id,
+null as my_vote
+from all_post ap
+;
+
+/* The old post view */
+/* create view post_view as */
+/* select */ 
+/* u.id as user_id, */
+/* pl.score as my_vote, */
+/* p.id as id, */ 
+/* p.name as name, */
+/* p.url, */
+/* p.body, */
+/* p.creator_id, */
+/* (select name from user_ where p.creator_id = user_.id) creator_name, */
+/* p.community_id, */
+/* (select name from community where p.community_id = community.id) as community_name, */
+/* (select count(*) from comment where comment.post_id = p.id) as number_of_comments, */
+/* coalesce(sum(pl.score) over (partition by p.id), 0) as score, */
+/* count (case when pl.score = 1 then 1 else null end) over (partition by p.id) as upvotes, */
+/* count (case when pl.score = -1 then 1 else null end) over (partition by p.id) as downvotes, */
+/* hot_rank(coalesce(sum(pl.score) over (partition by p.id) , 0), p.published) as hot_rank, */
+/* p.published, */
+/* p.updated */
+/* from user_ u */
+/* cross join post p */
+/* left join post_like pl on u.id = pl.user_id and p.id = pl.post_id; */
+
+
+