switch (and lazily convert) ivar names to 3.x

options_from_collection_for_select helper takes html attributes

Closes #10198.

Fix #7619. 0x prefix must be added when assigning hexadecimal string into bit column in Postgresql, because solving ambiguity.

Fix #7619. 0x prefix must be added when assigning hexadecimal string into bit column in Postgresql, because solving ambiguity.

Thank you @fxn :green_heart::yellow_heart::heart::purple_heart::blue_heart:

[ci skip]

Extract a Subscriber base class from LogSubscriber

Adds a ActiveSupport::Subscriber base class that LogSubscriber inherits
from. By inheriting from Subscriber, other kinds of subscribers can take
advantage of the event attachment system.

We tend to use Markdown for everything but the API, the
README is no longer used as the home page of the API
after 7a5aa720, so we can now migrate it.

replace match with get verb in ActionController::Metal

[ci skip]

[ci skip]

Fixed typos in AR CHANGELOG

db:test:load task should be favored over db:test:load_schema, because it
checks for chosen format (ActiveRecord::Base.schema_format).

closes #10227

Make [] method more readable

Fix bit string problem

This reverts commit cdd293cb.

Reason: This wasn't properly fix.

Use strip_heredoc where possible

AR postgres binary bug fix

interpolate instead of string concat

Add documentation for `collection.create!` on has_many records. [ci skip]

this shows a problem with nil values

use define_singleton_method instead of class_eval

Add :nodoc: mark to PerThreadRegistry#method_missing [ci skip]

Update github links