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* 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 option to ActiveRecord::Store.store_accessor.
*Tan Huynh*
* 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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