1 files changed, 103 insertions, 7 deletions

diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index e1cace7d88..6cdf9ebd9b 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,103 @@
+*   PostgreSQL, no longer disables user triggers if system triggers can't be
+    disabled. Disabling user triggers does not fulfill what the method promises.
+    Rails currently requires superuser privileges for this method.
+
+    If you absolutely rely on this behavior, consider patching
+    `disable_referential_integrity`.
+
+    *Yves Senn*
+
+*   Restore aborted transaction state when `disable_referential_integrity` fails
+    due to missing permissions.
+
+    *Toby Ovod-Everett*, *Yves Senn*
+
+*   PostgreSQL, print warning message if `disable_referential_integrity` fails
+    due to missing permissions.
+
+    *Andrey Nering*, *Yves Senn*
+
+*   Allow `:limit` option for MySQL bigint primary key support.
+
+    Example:
+
+        create_table :foos, id: :primary_key, limit: 8 do |t|
+        end
+
+        # or
+
+        create_table :foos, id: false do |t|
+          t.primary_key :id, limit: 8
+        end
+
+    *Ryuta Kamizono*
+
+*   `belongs_to` will now trigger a validation error by default if the association is not present.
+    You can turn this off on a per-association basis with `optional: true`.
+    (Note this new default only applies to new Rails apps that will be generated with
+    `config.active_record.belongs_to_required_by_default = true` in initializer.)
+
+    *Josef Šimánek*
+
+*   Fixed ActiveRecord::Relation#becomes! and changed_attributes issues for type
+    column.
+
+    Fixes #17139.
+
+    *Miklos Fazekas*
+
+*   Format the time string according to the precision of the time column.
+
+    *Ryuta Kamizono*
+
+*   Allow `:precision` option for time type columns.
+
+    *Ryuta Kamizono*
+
+*   Add `ActiveRecord::Base.suppress` to prevent the receiver from being saved
+    during the given block.
+
+    For example, here's a pattern of creating notifications when new comments
+    are posted. (The notification may in turn trigger an email, a push
+    notification, or just appear in the UI somewhere):
+
+        class Comment < ActiveRecord::Base
+          belongs_to :commentable, polymorphic: true
+          after_create -> { Notification.create! comment: self,
+            recipients: commentable.recipients }
+        end
+
+    That's what you want the bulk of the time. New comment creates a new
+    Notification. But there may well be off cases, like copying a commentable
+    and its comments, where you don't want that. So you'd have a concern
+    something like this:
+
+        module Copyable
+          def copy_to(destination)
+            Notification.suppress do
+              # Copy logic that creates new comments that we do not want triggering
+              # notifications.
+            end
+          end
+        end
+
+    *Michael Ryan*
+
+*   `:time` option added for `#touch`.
+
+    Fixes #18905.
+
+    *Hyonjee Joo*
+
+*   Deprecated passing of `start` value to `find_in_batches` and `find_each`
+    in favour of `begin_at` value.
+
+    *Vipul A M*
+
+*   Add `foreign_key_exists?` method.
+
+    *Tõnis Simo*
+
 *   Use SQL COUNT and LIMIT 1 queries for `none?` and `one?` methods if no block or limit is given,
     instead of loading the entire collection to memory.
     This applies to relations (e.g. `User.all`) as well as associations (e.g. `account.users`)
@@ -20,10 +120,6 @@
 
     *Eugene Gilburg*
 
-*   Allow `:precision` option for time type columns.
-
-    *Ryuta Kamizono*
-
 *   Have `enum` perform type casting consistently with the rest of Active
     Record, such as `where`.
 
@@ -32,9 +128,9 @@
 *   `scoping` no longer pollutes the current scope of sibling classes when using
     STI. e.x.
 
-    StiOne.none.scoping do
-      StiTwo.all
-    end
+        StiOne.none.scoping do
+          StiTwo.all
+        end
 
     Fixes #18806.