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* Fix circular `autosave: true`
Use a variable local to the `save_collection_association` method in
`activerecord/lib/active_record/autosave_association.rb`, instead of an
instance variable.
Prior to this PR, when there was a circular series of `autosave: true`
associations, the callback for a `has_many` association was run while
another instance of the same callback on the same association hadn't
finished running. When control returned to the first instance of the
callback, the instance variable had changed, and subsequent associated
records weren't saved correctly. Specifically, the ID field for the
`belongs_to` corresponding to the `has_many` was `nil`.
Fixes #28080.
*Larry Reid*
* Don't impose primary key order if limit() has already been supplied.
Fixes #23607
*Brian Christian*
* 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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