#264

2026-04-09 23:33:18 +09:00
parent b2d72ffcb0
commit 625507abf6
4 changed files with 83 additions and 61 deletions
@@ -1,5 +1,17 @@
 class CreatePostVersions < ActiveRecord::Migration[8.0]
-  def change
+  class Post < ApplicationRecord
+    self.table_name = 'posts'
+  end
+
+  class PostTag < ApplicationRecord
+    self.table_name = 'post_tags'
+  end
+
+  class PostVersion < ApplicationRecord
+    self.table_name = 'post_versions'
+  end
+
+  def up
    create_table :post_versions do |t|
      t.references :post, null: false, foreign_key: true
      t.integer :version_no, null: false
@@ -19,62 +31,45 @@ class CreatePostVersions < ActiveRecord::Migration[8.0]
      t.check_constraint "event_type IN ('create', 'update', 'discard', 'restore')"
    end

-    reversible do |dir|
-      dir.up do
-        execute <<~SQL
-          INSERT INTO
-            post_versions(
-              post_id
-            , version_no
-            , event_type
-            , title
-            , url
-            , thumbnail_base
-            , tags
-            , parent_id
-            , original_created_from
-            , original_created_before
-            , created_at
-            , created_by_user_id)
-          SELECT
-            posts.id
-          , 1
-          , 'create'
-          , posts.title
-          , posts.url
-          , posts.thumbnail_base
-          , COALESCE(tag_snapshots.tags, '')
-          , posts.parent_id
-          , posts.original_created_from
-          , posts.original_created_before
-          , posts.created_at
-          , posts.uploaded_user_id
-          FROM
-            posts
-            LEFT JOIN
-              (
-                SELECT
-                  post_tags.post_id
-                , GROUP_CONCAT(tag_names.name ORDER BY tag_names.name SEPARATOR ' ') AS tags
-                FROM
-                  post_tags
-                  INNER JOIN
-                    tags
-                    ON
-                      tags.id = post_tags.tag_id
-                  INNER JOIN
-                    tag_names
-                    ON
-                      tag_names.id = tags.tag_name_id
-                WHERE
-                  post_tags.discarded_at IS NULL
-                GROUP BY
-                  post_tags.post_id
-                ) tag_snapshots
-              ON
-                tag_snapshots.post_id = posts.id
-        SQL
+    say_with_time 'Backfilling post_versions' do
+      Post.find_in_batches(batch_size: 500) do |posts|
+        post_ids = posts.map(&:id)
+
+        tag_names_by_post_id =
+            PostTag
+            .joins('INNER JOIN tags ON tags.id = post_tags.tag_id')
+            .joins('INNER JOIN tag_names ON tag_names.id = tags.tag_name_id')
+            .where(post_id: post_ids)
+            .where('post_tags.discarded_at IS NULL')
+            .where('tags.discarded_at IS NULL')
+            .where('tag_names.discarded_at IS NULL')
+            .pluck('post_tags.post_id', 'tag_names.name')
+            .each_with_object(Hash.new { |h, k| h[k] = [] }) do |(post_id, tag_name), h|
+              h[post_id] << tag_name
+            end
+
+        rows = posts.map do |post|
+          tags = tag_names_by_post_id[post.id].uniq.sort.join(' ')
+          { post_id: post.id,
+            version_no: 1,
+            event_type: 'create',
+            title: post.title,
+            url: post.url,
+            thumbnail_base: post.thumbnail_base,
+            tags:,
+            parent_id: post.parent_id,
+            original_created_from: post.original_created_from,
+            original_created_before: post.original_created_before,
+            created_at: post.created_at,
+            created_by_user_id: post.uploaded_user_id }
+        end
+
+        PostVersion.insert_all!(rows) if rows.present?
      end
    end
  end
+
+  def down
+    drop_table :post_versions
+  end
 end