rails/activerecord/CHANGELOG.md

• validates_size_of / validates_length_of do not count records, which are marked_for_destruction?.

  Fixes #7247.

  Yves Senn

• Ensure first! and friends work on loaded associations.

  Fixes #18237.

  Sean Griffin

• eager_load preserves readonly flag for associations.

  Closes #15853.

  Takashi Kokubun

• Provide :touch option to save() to accommodate saving without updating timestamps.

  Fixes #18202.

  Dan Olson

• Provide a more helpful error message when an unsupported class is passed to serialize.

  Fixes #18224.

  Sean Griffin

• Add bigint primary key support for MySQL.

  Example:

  create_table :foos, id: :bigint do |t|
  end
  

  Ryuta Kamizono

• Support for any type primary key.

  Fixes #14194.

  Ryuta Kamizono

• Dump the default nil for PostgreSQL UUID primary key.

  Ryuta Kamizono

• Add a :foreign_key option to references and associated migration methods. The model and migration generators now use this option, rather than the add_foreign_key form.

  Sean Griffin

• Don't raise when writing an attribute with an out-of-range datetime passed by the user.

  Grey Baker

• Replace deprecated ActiveRecord::Tasks::DatabaseTasks#load_schema with ActiveRecord::Tasks::DatabaseTasks#load_schema_for.

  Yves Senn

• Fixes bug with 'ActiveRecord::Type::Numeric' that causes negative values to be marked as having changed when set to the same negative value.

  Closes #18161.

  Daniel Fox

• Introduce force: :cascade option for create_table. Using this option will recreate tables even if they have dependent objects (like foreign keys). db/schema.rb now uses force: :cascade. This makes it possible to reload the schema when foreign keys are in place.

  Matthew Draper, Yves Senn

• db:schema:load and db:structure:load no longer purge the database before loading the schema. This is left for the user to do. db:test:prepare will still purge the database.

  Closes #17945.

  Yves Senn

• Fix undesirable RangeError by Type::Integer. Add Type::UnsignedInteger.

  Ryuta Kamizono

• Add foreign_type option to has_one and has_many association macros.

  This option enables to define the column name of associated object's type for polymorphic associations.

  Ulisses Almeida, Kassio Borges

• Remove deprecated behavior allowing nested arrays to be passed as query values.

  Melanie Gilman

• Deprecate passing a class as a value in a query. Users should pass strings instead.

  Melanie Gilman

• add_timestamps and remove_timestamps now properly reversible with options.

  Noam Gagliardi-Rabinovich

• ActiveRecord::ConnectionAdapters::ColumnDumper#column_spec and ActiveRecord::ConnectionAdapters::ColumnDumper#prepare_column_options no longer have a types argument. They should access connection#native_database_types directly.

  Yves Senn

Please check 4-2-stable for previous changes.