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* Add database configuration to disable advisory locks.
```
production:
adapter: postgresql
advisory_locks: false
```
*Guo Xiang*
* SQLite3 adapter `alter_table` method restores foreign keys.
*Yasuo Honda*
* Allow `:to_table` option to `invert_remove_foreign_key`.
Example:
remove_foreign_key :accounts, to_table: :owners
*Nikolay Epifanov*, *Rich Chen*
* Add environment & load_config dependency to `bin/rake db:seed` to enable
seed load in environments without Rails and custom DB configuration
*Tobias Bielohlawek*
* Fix default value for mysql time types with specified precision.
*Nikolay Kondratyev*
* Fix `touch` option to behave consistently with `Persistence#touch` method.
*Ryuta Kamizono*
* Migrations raise when duplicate column definition.
Fixes #33024.
*Federico Martinez*
* Bump minimum SQLite version to 3.8
*Yasuo Honda*
* Fix parent record should not get saved with duplicate children records.
Fixes #32940.
*Santosh Wadghule*
* Fix logic on disabling commit callbacks so they are not called unexpectedly when errors occur.
*Brian Durand*
* Ensure `Associations::CollectionAssociation#size` and `Associations::CollectionAssociation#empty?`
use loaded association ids if present.
*Graham Turner*
* Add support to preload associations of polymorphic associations when not all the records have the requested associations.
*Dana Sherson*
* Add `touch_all` method to `ActiveRecord::Relation`.
Example:
Person.where(name: "David").touch_all(time: Time.new(2020, 5, 16, 0, 0, 0))
*fatkodima*, *duggiefresh*
* Add `ActiveRecord::Base.base_class?` predicate.
*Bogdan Gusiev*
* Add custom prefix/suffix options to `ActiveRecord::Store.store_accessor`.
*Tan Huynh*, *Yukio Mizuta*
* Rails 6 requires Ruby 2.4.1 or newer.
*Jeremy Daer*
* Deprecate `update_attributes`/`!` in favor of `update`/`!`.
*Eddie Lebow*
* Add ActiveRecord::Base.create_or_find_by/! to deal with the SELECT/INSERT race condition in
ActiveRecord::Base.find_or_create_by/! by leaning on unique constraints in the database.
*DHH*
* Add `Relation#pick` as short-hand for single-value plucks.
*DHH*
Please check [5-2-stable](https://github.com/rails/rails/blob/5-2-stable/activerecord/CHANGELOG.md) for previous changes.
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