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Diffstat (limited to 'activerecord/CHANGELOG.md')
| -rw-r--r-- | activerecord/CHANGELOG.md | 96 |
1 files changed, 95 insertions, 1 deletions
diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md index 89a12d4223..c88a4e7695 100644 --- a/activerecord/CHANGELOG.md +++ b/activerecord/CHANGELOG.md @@ -1,3 +1,98 @@ +* Log database query callers + + Add `verbose_query_logs` configuration option to display the caller + of database queries in the log to facilitate N+1 query resolution + and other debugging. Excludes Ruby and Rails callers but not gems. + + Enabled in development only for new and upgraded applications. Not + recommended for use in the production environment since it relies + on Ruby's `Kernel#caller` which is fairly slow. + + *Olivier Lacan* + +* Fix conflicts `counter_cache` with `touch: true` by optimistic locking. + + ``` + # create_table :posts do |t| + # t.integer :comments_count, default: 0 + # t.integer :lock_version + # t.timestamps + # end + class Post < ApplicationRecord + end + + # create_table :comments do |t| + # t.belongs_to :post + # end + class Comment < ApplicationRecord + belongs_to :post, touch: true, counter_cache: true + end + ``` + + Before: + ``` + post = Post.create! + # => begin transaction + INSERT INTO "posts" ("created_at", "updated_at", "lock_version") + VALUES ("2017-12-11 21:27:11.387397", "2017-12-11 21:27:11.387397", 0) + commit transaction + + comment = Comment.create!(post: post) + # => begin transaction + INSERT INTO "comments" ("post_id") VALUES (1) + + UPDATE "posts" SET "comments_count" = COALESCE("comments_count", 0) + 1, + "lock_version" = COALESCE("lock_version", 0) + 1 WHERE "posts"."id" = 1 + + UPDATE "posts" SET "updated_at" = '2017-12-11 21:27:11.398330', + "lock_version" = 1 WHERE "posts"."id" = 1 AND "posts"."lock_version" = 0 + rollback transaction + # => ActiveRecord::StaleObjectError: Attempted to touch a stale object: Post. + + Comment.take.destroy! + # => begin transaction + DELETE FROM "comments" WHERE "comments"."id" = 1 + + UPDATE "posts" SET "comments_count" = COALESCE("comments_count", 0) - 1, + "lock_version" = COALESCE("lock_version", 0) + 1 WHERE "posts"."id" = 1 + + UPDATE "posts" SET "updated_at" = '2017-12-11 21:42:47.785901', + "lock_version" = 1 WHERE "posts"."id" = 1 AND "posts"."lock_version" = 0 + rollback transaction + # => ActiveRecord::StaleObjectError: Attempted to touch a stale object: Post. + ``` + + After: + ``` + post = Post.create! + # => begin transaction + INSERT INTO "posts" ("created_at", "updated_at", "lock_version") + VALUES ("2017-12-11 21:27:11.387397", "2017-12-11 21:27:11.387397", 0) + commit transaction + + comment = Comment.create!(post: post) + # => begin transaction + INSERT INTO "comments" ("post_id") VALUES (1) + + UPDATE "posts" SET "comments_count" = COALESCE("comments_count", 0) + 1, + "lock_version" = COALESCE("lock_version", 0) + 1, + "updated_at" = '2017-12-11 21:37:09.802642' WHERE "posts"."id" = 1 + commit transaction + + comment.destroy! + # => begin transaction + DELETE FROM "comments" WHERE "comments"."id" = 1 + + UPDATE "posts" SET "comments_count" = COALESCE("comments_count", 0) - 1, + "lock_version" = COALESCE("lock_version", 0) + 1, + "updated_at" = '2017-12-11 21:39:02.685520' WHERE "posts"."id" = 1 + commit transaction + ``` + + Fixes #31199. + + *bogdanvlviv* + * Add support for PostgreSQL operator classes to `add_index`. Example: @@ -453,5 +548,4 @@ *Kevin McPhillips* - Please check [5-1-stable](https://github.com/rails/rails/blob/5-1-stable/activerecord/CHANGELOG.md) for previous changes. |