rails--rails/activerecord/CHANGELOG.md

• 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 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 for previous changes.