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* Preserve user supplied joins order as much as possible.
Fixes #36761, #34328, #24281, #12953.
*Ryuta Kamizono*
* Allow `matches_regex` and `does_not_match_regexp` on the MySQL Arel visitor.
*James Pearson*
* Allow specifying fixtures to be ignored by setting `ignore` in YAML file's '_fixture' section.
*Tongfei Gao*
* Make the DATABASE_URL env variable only affect the primary connection. Add new env variables for multiple databases.
*John Crepezzi*, *Eileen Uchitelle*
* Add a warning for enum elements with 'not_' prefix.
class Foo
enum status: [:sent, :not_sent]
end
*Edu Depetris*
* Make currency symbols optional for money column type in PostgreSQL
*Joel Schneider*
* Add support for beginless ranges, introduced in Ruby 2.7.
*Josh Goodall*
* Add database_exists? method to connection adapters to check if a database exists.
*Guilherme Mansur*
* Loading the schema for a model that has no `table_name` raises a `TableNotSpecified` error.
*Guilherme Mansur*, *Eugene Kenny*
* PostgreSQL: Fix GROUP BY with ORDER BY virtual count attribute.
Fixes #36022.
*Ryuta Kamizono*
* Make ActiveRecord `ConnectionPool.connections` method thread-safe.
Fixes #36465.
*Jeff Doering*
* Add support for multiple databases to `rails db:abort_if_pending_migrations`.
*Mark Lee*
* Fix sqlite3 collation parsing when using decimal columns.
*Martin R. Schuster*
* Fix invalid schema when primary key column has a comment.
Fixes #29966.
*Guilherme Goettems Schneider*
* Fix table comment also being applied to the primary key column.
*Guilherme Goettems Schneider*
* Allow generated `create_table` migrations to include or skip timestamps.
*Michael Duchemin*
Please check [6-0-stable](https://github.com/rails/rails/blob/6-0-stable/activerecord/CHANGELOG.md) for previous changes.
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