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* 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](https://github.com/rails/rails/blob/4-2-stable/activerecord/CHANGELOG.md) for previous changes.
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