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* Loading model schema from database is now thread-safe.
Fixes #28589.
*Vikrant Chaudhary*, *David Abdemoulaie*
* Add `ActiveRecord::Base#cache_version` to support recyclable cache keys via the new versioned entries
in `ActiveSupport::Cache`. This also means that `ActiveRecord::Base#cache_key` will now return a stable key
that does not include a timestamp any more.
NOTE: This feature is turned off by default, and `#cache_key` will still return cache keys with timestamps
until you set `ActiveRecord::Base.cache_versioning = true`. That's the setting for all new apps on Rails 5.2+
*DHH*
* Respect `SchemaDumper.ignore_tables` in rake tasks for databases structure dump
*Rusty Geldmacher*, *Guillermo Iguaran*
* Add type caster to `RuntimeReflection#alias_name`
Fixes #28959.
*Jon Moss*
* Deprecate `supports_statement_cache?`.
*Ryuta Kamizono*
* Quote database name in `db:create` grant statement (when database user does not have access to create the database).
*Rune Philosof*
* Raise error `UnknownMigrationVersionError` on the movement of migrations
when the current migration does not exist.
*bogdanvlviv*
* Fix `bin/rails db:forward` first migration.
*bogdanvlviv*
* Support Descending Indexes for MySQL.
MySQL 8.0.1 and higher supports descending indexes: `DESC` in an index definition is no longer ignored.
See https://dev.mysql.com/doc/refman/8.0/en/descending-indexes.html.
*Ryuta Kamizono*
* Fix inconsistency with changed attributes when overriding AR attribute reader.
*bogdanvlviv*
* When calling the dynamic fixture accessor method with no arguments it now returns all fixtures of this type.
Previously this method always returned an empty array.
*Kevin McPhillips*
Please check [5-1-stable](https://github.com/rails/rails/blob/5-1-stable/activerecord/CHANGELOG.md) for previous changes.
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