2 files changed, 136 insertions, 0 deletions
diff --git a/migrations/2018-05-01-141548_add-users/down.sql b/migrations/2018-05-01-141548_add-users/down.sql
new file mode 100644
index 000000000000..a29ee47dd641
--- /dev/null
+++ b/migrations/2018-05-01-141548_add-users/down.sql
@@ -0,0 +1,61 @@
+-- First restore the old columns:
+ALTER TABLE threads ADD COLUMN author_name VARCHAR;
+ALTER TABLE threads ADD COLUMN author_email VARCHAR;
+ALTER TABLE posts ADD COLUMN author_name VARCHAR;
+ALTER TABLE posts ADD COLUMN author_email VARCHAR;
+
+-- Then select the data back into them:
+UPDATE threads SET author_name = users.name,
+                   author_email = users.email
+  FROM users
+  WHERE threads.author = users.id;
+
+UPDATE posts SET author_name = users.name,
+                 author_email = users.email
+  FROM users
+  WHERE posts.author = users.id;
+
+-- add the constraints back:
+ALTER TABLE threads ALTER COLUMN author_name SET NOT NULL;
+ALTER TABLE threads ALTER COLUMN author_email SET NOT NULL;
+ALTER TABLE posts ALTER COLUMN author_name SET NOT NULL;
+ALTER TABLE posts ALTER COLUMN author_email SET NOT NULL;
+
+-- reset the index view:
+CREATE OR REPLACE VIEW thread_index AS
+  SELECT t.id AS thread_id,
+         t.title AS title,
+         t.author_name AS thread_author,
+         t.posted AS created,
+         t.sticky AS sticky,
+         p.id AS post_id,
+         p.author_name AS post_author,
+         p.posted AS posted
+    FROM threads t
+    JOIN (SELECT DISTINCT ON (thread_id)
+           id, thread_id, author_name, posted
+          FROM posts
+          ORDER BY thread_id, id DESC) AS p
+    ON t.id = p.thread_id
+    ORDER BY t.sticky DESC, p.id DESC;
+
+-- reset the search view:
+DROP MATERIALIZED VIEW search_index;
+CREATE MATERIALIZED VIEW search_index AS
+  SELECT p.id AS post_id,
+         p.author_name AS author,
+         t.id AS thread_id,
+         t.title AS title,
+         p.body AS body,
+         setweight(to_tsvector('english', t.title), 'B') ||
+         setweight(to_tsvector('english', p.body), 'A') ||
+         setweight(to_tsvector('simple', t.author_name), 'C') ||
+         setweight(to_tsvector('simple', p.author_name), 'C') AS document
+    FROM posts p
+    JOIN threads t
+    ON t.id = p.thread_id;
+
+-- and drop the users table and columns:
+ALTER TABLE posts DROP COLUMN author;
+ALTER TABLE threads DROP COLUMN author;
+DROP TABLE users;
diff --git a/migrations/2018-05-01-141548_add-users/up.sql b/migrations/2018-05-01-141548_add-users/up.sql
new file mode 100644
index 000000000000..bb358f47b537
--- /dev/null
+++ b/migrations/2018-05-01-141548_add-users/up.sql
@@ -0,0 +1,75 @@
+-- This query creates a users table and migrates the existing user
+-- information (from the posts table) into it.
+
+CREATE TABLE users (
+  id SERIAL PRIMARY KEY,
+  email VARCHAR NOT NULL UNIQUE,
+  name VARCHAR NOT NULL,
+  admin BOOLEAN NOT NULL DEFAULT false
+);
+
+INSERT INTO users (email, name)
+SELECT author_email AS email,
+       author_name AS name
+FROM posts
+GROUP BY name, email;
+
+-- Create the 'author' column in the relevant tables (initially
+-- without a not-null constraint) and populate it with the data
+-- selected above:
+ALTER TABLE posts ADD COLUMN author INTEGER REFERENCES users (id);
+UPDATE posts SET author = users.id
+  FROM users
+  WHERE users.email = posts.author_email;
+
+ALTER TABLE threads ADD COLUMN author INTEGER REFERENCES users (id);
+UPDATE threads SET author = users.id
+  FROM users
+  WHERE users.email = threads.author_email;
+
+-- Add the constraints:
+ALTER TABLE posts ALTER COLUMN author SET NOT NULL;
+ALTER TABLE threads ALTER COLUMN author SET NOT NULL;
+
+-- Update the index view:
+CREATE OR REPLACE VIEW thread_index AS
+  SELECT t.id AS thread_id,
+         t.title AS title,
+         ta.name AS thread_author,
+         t.posted AS created,
+         t.sticky AS sticky,
+         p.id AS post_id,
+         pa.name AS post_author,
+         p.posted AS posted
+    FROM threads t
+    JOIN (SELECT DISTINCT ON (thread_id)
+           id, thread_id, author, posted
+          FROM posts
+          ORDER BY thread_id, id DESC) AS p
+    ON t.id = p.thread_id
+    JOIN users ta ON ta.id = t.author
+    JOIN users pa ON pa.id = p.author
+    ORDER BY t.sticky DESC, p.id DESC;
+
+-- Update the search view:
+DROP MATERIALIZED VIEW search_index;
+CREATE MATERIALIZED VIEW search_index AS
+  SELECT p.id AS post_id,
+         pa.name AS author,
+         t.id AS thread_id,
+         t.title AS title,
+         p.body AS body,
+         setweight(to_tsvector('english', t.title), 'B') ||
+         setweight(to_tsvector('english', p.body), 'A') ||
+         setweight(to_tsvector('simple', ta.name), 'C') ||
+         setweight(to_tsvector('simple', pa.name), 'C') AS document
+    FROM posts p
+    JOIN threads t ON t.id = p.thread_id
+    JOIN users ta ON ta.id = t.author
+    JOIN users pa ON pa.id = p.author;
+
+-- And drop the old fields:
+ALTER TABLE posts DROP COLUMN author_name;
+ALTER TABLE posts DROP COLUMN author_email;
+ALTER TABLE threads DROP COLUMN author_name;
+ALTER TABLE threads DROP COLUMN author_email;