Start Rails 6.1 development

1 files changed, 1 insertions, 945 deletions

diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index a8893d7164..f708d42e43 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,947 +1,3 @@
-*   Add `touch` option to `has_one` association.
 
-    *Abhay Nikam*
 
-*   Deprecate `where.not` working as NOR and will be changed to NAND in Rails 6.1.
-
-    ```ruby
-    all = [treasures(:diamond), treasures(:sapphire), cars(:honda), treasures(:sapphire)]
-    assert_equal all, PriceEstimate.all.map(&:estimate_of)
-    ```
-
-    In Rails 6.0:
-
-    ```ruby
-    sapphire = treasures(:sapphire)
-
-    nor = all.reject { |e|
-      e.estimate_of_type == sapphire.class.polymorphic_name
-    }.reject { |e|
-      e.estimate_of_id == sapphire.id
-    }
-    assert_equal [cars(:honda)], nor
-
-    without_sapphire = PriceEstimate.where.not(
-      estimate_of_type: sapphire.class.polymorphic_name, estimate_of_id: sapphire.id
-    )
-    assert_equal nor, without_sapphire.map(&:estimate_of)
-    ```
-
-    In Rails 6.1:
-
-    ```ruby
-    sapphire = treasures(:sapphire)
-
-    nand = all - [sapphire]
-    assert_equal [treasures(:diamond), cars(:honda)], nand
-
-    without_sapphire = PriceEstimate.where.not(
-      estimate_of_type: sapphire.class.polymorphic_name, estimate_of_id: sapphire.id
-    )
-    assert_equal nand, without_sapphire.map(&:estimate_of)
-    ```
-
-    *Ryuta Kamizono*
-
-*   Fix dirty tracking after rollback.
-
-    Fixes #15018, #30167, #33868.
-
-    *Ryuta Kamizono*
-
-*   Add `ActiveRecord::Relation#cache_version` to support recyclable cache keys via
-    the versioned entries in `ActiveSupport::Cache`. This also means that
-    `ActiveRecord::Relation#cache_key` will now return a stable key that does not
-    include the max timestamp or count 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.collection_cache_versioning = true`.
-    That's the setting for all new apps on Rails 6.0+
-
-    *Lachlan Sylvester*
-
-*   Fix dirty tracking for `touch` to track saved changes.
-
-    Fixes #33429.
-
-    *Ryuta Kamzono*
-
-*   `change_column_comment` and `change_table_comment` are invertible only if
-    `to` and `from` options are specified.
-
-    *Yoshiyuki Kinjo*
-
-*   Don't call commit/rollback callbacks when a record isn't saved.
-
-    Fixes #29747.
-
-    *Ryuta Kamizono*
-
-*   Fix circular `autosave: true` causes invalid records to be saved.
-
-    Prior to the fix, when there was a circular series of `autosave: true`
-    associations, the callback for a `has_many` association was run while
-    another instance of the same callback on the same association hadn't
-    finished running. When control returned to the first instance of the
-    callback, the instance variable had changed, and subsequent associated
-    records weren't saved correctly. Specifically, the ID field for the
-    `belongs_to` corresponding to the `has_many` was `nil`.
-
-    Fixes #28080.
-
-    *Larry Reid*
-
-*   Raise `ArgumentError` for invalid `:limit` and `:precision` like as other options.
-
-    Before:
-
-    ```ruby
-    add_column :items, :attr1, :binary,   size: 10      # => ArgumentError
-    add_column :items, :attr2, :decimal,  scale: 10     # => ArgumentError
-    add_column :items, :attr3, :integer,  limit: 10     # => ActiveRecordError
-    add_column :items, :attr4, :datetime, precision: 10 # => ActiveRecordError
-    ```
-
-    After:
-
-    ```ruby
-    add_column :items, :attr1, :binary,   size: 10      # => ArgumentError
-    add_column :items, :attr2, :decimal,  scale: 10     # => ArgumentError
-    add_column :items, :attr3, :integer,  limit: 10     # => ArgumentError
-    add_column :items, :attr4, :datetime, precision: 10 # => ArgumentError
-    ```
-
-    *Ryuta Kamizono*
-
-*   Association loading isn't to be affected by scoping consistently
-    whether preloaded / eager loaded or not, with the exception of `unscoped`.
-
-    Before:
-
-    ```ruby
-    Post.where("1=0").scoping do
-      Comment.find(1).post                   # => nil
-      Comment.preload(:post).find(1).post    # => #<Post id: 1, ...>
-      Comment.eager_load(:post).find(1).post # => #<Post id: 1, ...>
-    end
-    ```
-
-    After:
-
-    ```ruby
-    Post.where("1=0").scoping do
-      Comment.find(1).post                   # => #<Post id: 1, ...>
-      Comment.preload(:post).find(1).post    # => #<Post id: 1, ...>
-      Comment.eager_load(:post).find(1).post # => #<Post id: 1, ...>
-    end
-    ```
-
-    Fixes #34638, #35398.
-
-    *Ryuta Kamizono*
-
-*   Add `rails db:prepare` to migrate or setup a database.
-
-    Runs `db:migrate` if the database exists or `db:setup` if it doesn't.
-
-    *Roberto Miranda*
-
-*   Add `after_save_commit` callback as shortcut for `after_commit :hook, on: [ :create, :update ]`.
-
-    *DHH*
-
-*   Assign all attributes before calling `build` to ensure the child record is visible in
-    `before_add` and `after_add` callbacks for `has_many :through` associations.
-
-    Fixes #33249.
-
-    *Ryan H. Kerr*
-
-*   Add `ActiveRecord::Relation#extract_associated` for extracting associated records from a relation.
-
-    ```
-    account.memberships.extract_associated(:user)
-    # => Returns collection of User records
-    ```
-
-    *DHH*
-
-*   Add `ActiveRecord::Relation#annotate` for adding SQL comments to its queries.
-
-    For example:
-
-    ```
-    Post.where(id: 123).annotate("this is a comment").to_sql
-    # SELECT "posts".* FROM "posts" WHERE "posts"."id" = 123 /* this is a comment */
-    ```
-
-    This can be useful in instrumentation or other analysis of issued queries.
-
-    *Matt Yoho*
-
-*   Support Optimizer Hints.
-
-    In most databases, a way to control the optimizer is by using optimizer hints,
-    which can be specified within individual statements.
-
-    Example (for MySQL):
-
-        Topic.optimizer_hints("MAX_EXECUTION_TIME(50000)", "NO_INDEX_MERGE(topics)")
-        # SELECT /*+ MAX_EXECUTION_TIME(50000) NO_INDEX_MERGE(topics) */ `topics`.* FROM `topics`
-
-    Example (for PostgreSQL with pg_hint_plan):
-
-        Topic.optimizer_hints("SeqScan(topics)", "Parallel(topics 8)")
-        # SELECT /*+ SeqScan(topics) Parallel(topics 8) */ "topics".* FROM "topics"
-
-    See also:
-
-    * https://dev.mysql.com/doc/refman/8.0/en/optimizer-hints.html
-    * https://pghintplan.osdn.jp/pg_hint_plan.html
-    * https://docs.oracle.com/en/database/oracle/oracle-database/12.2/tgsql/influencing-the-optimizer.html
-    * https://docs.microsoft.com/en-us/sql/t-sql/queries/hints-transact-sql-query?view=sql-server-2017
-    * https://www.ibm.com/support/knowledgecenter/en/SSEPGG_11.1.0/com.ibm.db2.luw.admin.perf.doc/doc/c0070117.html
-
-    *Ryuta Kamizono*
-
-*   Fix query attribute method on user-defined attribute to be aware of typecasted value.
-
-    For example, the following code no longer return false as casted non-empty string:
-
-    ```
-    class Post < ActiveRecord::Base
-      attribute :user_defined_text, :text
-    end
-
-    Post.new(user_defined_text: "false").user_defined_text? # => true
-    ```
-
-    *Yuji Kamijima*
-
-*   Quote empty ranges like other empty enumerables.
-
-    *Patrick Rebsch*
-
-*   Add `insert_all`/`insert_all!`/`upsert_all` methods to `ActiveRecord::Persistence`,
-    allowing bulk inserts akin to the bulk updates provided by `update_all` and
-    bulk deletes by `delete_all`.
-
-    Supports skipping or upserting duplicates through the `ON CONFLICT` syntax
-    for PostgreSQL (9.5+) and SQLite (3.24+) and `ON DUPLICATE KEY UPDATE` syntax
-    for MySQL.
-
-    *Bob Lail*
-
-*   Add `rails db:seed:replant` that truncates tables of each database
-    for current environment and loads the seeds.
-
-    *bogdanvlviv*, *DHH*
-
-*   Add `ActiveRecord::Base.connection.truncate` for SQLite3 adapter.
-
-    *bogdanvlviv*
-
-*   Deprecate mismatched collation comparison for uniqueness validator.
-
-    Uniqueness validator will no longer enforce case sensitive comparison in Rails 6.1.
-    To continue case sensitive comparison on the case insensitive column,
-    pass `case_sensitive: true` option explicitly to the uniqueness validator.
-
-    *Ryuta Kamizono*
-
-*   Add `reselect` method. This is a short-hand for `unscope(:select).select(fields)`.
-
-    Fixes #27340.
-
-    *Willian Gustavo Veiga*
-
-*   Add negative scopes for all enum values.
-
-    Example:
-
-        class Post < ActiveRecord::Base
-          enum status: %i[ drafted active trashed ]
-        end
-
-        Post.not_drafted # => where.not(status: :drafted)
-        Post.not_active  # => where.not(status: :active)
-        Post.not_trashed # => where.not(status: :trashed)
-
-    *DHH*
-
-*   Fix different `count` calculation when using `size` with manual `select` with DISTINCT.
-
-    Fixes #35214.
-
-    *Juani Villarejo*
-
-
-## Rails 6.0.0.beta3 (March 11, 2019) ##
-
-*   No changes.
-
-
-## Rails 6.0.0.beta2 (February 25, 2019) ##
-
-*   Fix prepared statements caching to be enabled even when query caching is enabled.
-
-    *Ryuta Kamizono*
-
-*   Ensure `update_all` series cares about optimistic locking.
-
-    *Ryuta Kamizono*
-
-*   Don't allow `where` with non numeric string matches to 0 values.
-
-    *Ryuta Kamizono*
-
-*   Introduce `ActiveRecord::Relation#destroy_by` and `ActiveRecord::Relation#delete_by`.
-
-    `destroy_by` allows relation to find all the records matching the condition and perform
-    `destroy_all` on the matched records.
-
-    Example:
-
-        Person.destroy_by(name: 'David')
-        Person.destroy_by(name: 'David', rating: 4)
-
-        david = Person.find_by(name: 'David')
-        david.posts.destroy_by(id: [1, 2, 3])
-
-    `delete_by` allows relation to find all the records matching the condition and perform
-    `delete_all` on the matched records.
-
-    Example:
-
-        Person.delete_by(name: 'David')
-        Person.delete_by(name: 'David', rating: 4)
-
-        david = Person.find_by(name: 'David')
-        david.posts.delete_by(id: [1, 2, 3])
-
-    *Abhay Nikam*
-
-*   Don't allow `where` with invalid value matches to nil values.
-
-    Fixes #33624.
-
-    *Ryuta Kamizono*
-
-*   SQLite3: Implement `add_foreign_key` and `remove_foreign_key`.
-
-    *Ryuta Kamizono*
-
-*   Deprecate using class level querying methods if the receiver scope
-    regarded as leaked. Use `klass.unscoped` to avoid the leaking scope.
-
-    *Ryuta Kamizono*
-
-*   Allow applications to automatically switch connections.
-
-    Adds a middleware and configuration options that can be used in your
-    application to automatically switch between the writing and reading
-    database connections.
-
-    `GET` and `HEAD` requests will read from the replica unless there was
-    a write in the last 2 seconds, otherwise they will read from the primary.
-    Non-get requests will always write to the primary. The middleware accepts
-    an argument for a Resolver class and a Operations class where you are able
-    to change how the auto-switcher works to be most beneficial for your
-    application.
-
-    To use the middleware in your application you can use the following
-    configuration options:
-
-    ```
-    config.active_record.database_selector = { delay: 2.seconds }
-    config.active_record.database_resolver = ActiveRecord::Middleware::DatabaseSelector::Resolver
-    config.active_record.database_resolver_context = ActiveRecord::Middleware::DatabaseSelector::Resolver::Session
-    ```
-
-    To change the database selection strategy, pass a custom class to the
-    configuration options:
-
-    ```
-    config.active_record.database_selector = { delay: 10.seconds }
-    config.active_record.database_resolver = MyResolver
-    config.active_record.database_resolver_context = MyResolver::MyCookies
-    ```
-
-    *Eileen M. Uchitelle*
-
-*   MySQL: Support `:size` option to change text and blob size.
-
-    *Ryuta Kamizono*
-
-*   Make `t.timestamps` with precision by default.
-
-    *Ryuta Kamizono*
-
-
-## Rails 6.0.0.beta1 (January 18, 2019) ##
-
-*   Remove deprecated `#set_state` from the transaction object.
-
-    *Rafael Mendonça França*
-
-*   Remove deprecated `#supports_statement_cache?` from the database adapters.
-
-    *Rafael Mendonça França*
-
-*   Remove deprecated `#insert_fixtures` from the database adapters.
-
-    *Rafael Mendonça França*
-
-*   Remove deprecated `ActiveRecord::ConnectionAdapters::SQLite3Adapter#valid_alter_table_type?`.
-
-    *Rafael Mendonça França*
-
-*   Do not allow passing the column name to `sum` when a block is passed.
-
-    *Rafael Mendonça França*
-
-*   Do not allow passing the column name to `count` when a block is passed.
-
-    *Rafael Mendonça França*
-
-*   Remove delegation of missing methods in a relation to arel.
-
-    *Rafael Mendonça França*
-
-*   Remove delegation of missing methods in a relation to private methods of the class.
-
-    *Rafael Mendonça França*
-
-*   Deprecate `config.activerecord.sqlite3.represent_boolean_as_integer`.
-
-    *Rafael Mendonça França*
-
-*   Change `SQLite3Adapter` to always represent boolean values as integers.
-
-    *Rafael Mendonça França*
-
-*   Remove ability to specify a timestamp name for `#cache_key`.
-
-    *Rafael Mendonça França*
-
-*   Remove deprecated `ActiveRecord::Migrator.migrations_path=`.
-
-    *Rafael Mendonça França*
-
-*   Remove deprecated `expand_hash_conditions_for_aggregates`.
-
-    *Rafael Mendonça França*
-
-*   Set polymorphic type column to NULL on `dependent: :nullify` strategy.
-
-    On polymorphic associations both the foreign key and the foreign type columns will be set to NULL.
-
-    *Laerti Papa*
-
-*   Allow permitted instance of `ActionController::Parameters` as argument of `ActiveRecord::Relation#exists?`.
-
-    *Gannon McGibbon*
-
-*   Add support for endless ranges introduces in Ruby 2.6.
-
-    *Greg Navis*
-
-*   Deprecate passing `migrations_paths` to `connection.assume_migrated_upto_version`.
-
-    *Ryuta Kamizono*
-
-*   MySQL: `ROW_FORMAT=DYNAMIC` create table option by default.
-
-    Since MySQL 5.7.9, the `innodb_default_row_format` option defines the default row
-    format for InnoDB tables. The default setting is `DYNAMIC`.
-    The row format is required for indexing on `varchar(255)` with `utf8mb4` columns.
-
-    *Ryuta Kamizono*
-
-*   Fix join table column quoting with SQLite.
-
-    *Gannon McGibbon*
-
-*   Allow disabling scopes generated by `ActiveRecord.enum`.
-
-    *Alfred Dominic*
-
-*   Ensure that `delete_all` on collection proxy returns affected count.
-
-    *Ryuta Kamizono*
-
-*   Reset scope after delete on collection association to clear stale offsets of removed records.
-
-    *Gannon McGibbon*
-
-*   Add the ability to prevent writes to a database for the duration of a block.
-
-    Allows the application to prevent writes to a database. This can be useful when
-    you're building out multiple databases and want to make sure you're not sending
-    writes when you want a read.
-
-    If `while_preventing_writes` is called and the query is considered a write
-    query the database will raise an exception regardless of whether the database
-    user is able to write.
-
-    This is not meant to be a catch-all for write queries but rather a way to enforce
-    read-only queries without opening a second connection. One purpose of this is to
-    catch accidental writes, not all writes.
-
-    *Eileen M. Uchitelle*
-
-*   Allow aliased attributes to be used in `#update_columns` and `#update`.
-
-    *Gannon McGibbon*
-
-*   Allow spaces in postgres table names.
-
-    Fixes issue where "user post" is misinterpreted as "\"user\".\"post\"" when quoting table names with the postgres adapter.
-
-    *Gannon McGibbon*
-
-*   Cached `columns_hash` fields should be excluded from `ResultSet#column_types`.
-
-    PR #34528 addresses the inconsistent behaviour when attribute is defined for an ignored column. The following test
-    was passing for SQLite and MySQL, but failed for PostgreSQL:
-
-    ```ruby
-    class DeveloperName < ActiveRecord::Type::String
-      def deserialize(value)
-        "Developer: #{value}"
-      end
-    end
-
-    class AttributedDeveloper < ActiveRecord::Base
-      self.table_name = "developers"
-
-      attribute :name, DeveloperName.new
-
-      self.ignored_columns += ["name"]
-    end
-
-    developer = AttributedDeveloper.create
-    developer.update_column :name, "name"
-
-    loaded_developer = AttributedDeveloper.where(id: developer.id).select("*").first
-    puts loaded_developer.name # should be "Developer: name" but it's just "name"
-    ```
-
-    *Dmitry Tsepelev*
-
-*   Make the implicit order column configurable.
-
-    When calling ordered finder methods such as `first` or `last` without an
-    explicit order clause, ActiveRecord sorts records by primary key. This can
-    result in unpredictable and surprising behaviour when the primary key is
-    not an auto-incrementing integer, for example when it's a UUID. This change
-    makes it possible to override the column used for implicit ordering such
-    that `first` and `last` will return more predictable results.
-
-    Example:
-
-        class Project < ActiveRecord::Base
-          self.implicit_order_column = "created_at"
-        end
-
-    *Tekin Suleyman*
-
-*   Bump minimum PostgreSQL version to 9.3.
-
-    *Yasuo Honda*
-
-*   Values of enum are frozen, raising an error when attempting to modify them.
-
-    *Emmanuel Byrd*
-
-*   Move `ActiveRecord::StatementInvalid` SQL to error property and include binds as separate error property.
-
-    `ActiveRecord::ConnectionAdapters::AbstractAdapter#translate_exception_class` now requires `binds` to be passed as the last argument.
-
-    `ActiveRecord::ConnectionAdapters::AbstractAdapter#translate_exception` now requires `message`, `sql`, and `binds` to be passed as keyword arguments.
-
-    Subclasses of `ActiveRecord::StatementInvalid` must now provide `sql:` and `binds:` arguments to `super`.
-
-    Example:
-
-    ```
-    class MySubclassedError < ActiveRecord::StatementInvalid
-      def initialize(message, sql:, binds:)
-        super(message, sql: sql, binds: binds)
-      end
-    end
-    ```
-
-    *Gannon McGibbon*
-
-*   Add an `:if_not_exists` option to `create_table`.
-
-    Example:
-
-        create_table :posts, if_not_exists: true do |t|
-          t.string :title
-        end
-
-    That would execute:
-
-        CREATE TABLE IF NOT EXISTS posts (
-          ...
-        )
-
-    If the table already exists, `if_not_exists: false` (the default) raises an
-    exception whereas `if_not_exists: true` does nothing.
-
-    *fatkodima*, *Stefan Kanev*
-
-*   Defining an Enum as a Hash with blank key, or as an Array with a blank value, now raises an `ArgumentError`.
-
-    *Christophe Maximin*
-
-*   Adds support for multiple databases to `rails db:schema:cache:dump` and `rails db:schema:cache:clear`.
-
-    *Gannon McGibbon*
-
-*   `update_columns` now correctly raises `ActiveModel::MissingAttributeError`
-    if the attribute does not exist.
-
-    *Sean Griffin*
-
-*   Add support for hash and URL configs in database hash of `ActiveRecord::Base.connected_to`.
-
-    ````
-    User.connected_to(database: { writing: "postgres://foo" }) do
-      User.create!(name: "Gannon")
-    end
-
-    config = { "adapter" => "sqlite3", "database" => "db/readonly.sqlite3" }
-    User.connected_to(database: { reading: config }) do
-      User.count
-    end
-    ````
-
-    *Gannon McGibbon*
-
-*   Support default expression for MySQL.
-
-    MySQL 8.0.13 and higher supports default value to be a function or expression.
-
-    https://dev.mysql.com/doc/refman/8.0/en/create-table.html
-
-    *Ryuta Kamizono*
-
-*   Support expression indexes for MySQL.
-
-    MySQL 8.0.13 and higher supports functional key parts that index
-    expression values rather than column or column prefix values.
-
-    https://dev.mysql.com/doc/refman/8.0/en/create-index.html
-
-    *Ryuta Kamizono*
-
-*   Fix collection cache key with limit and custom select to avoid ambiguous timestamp column error.
-
-    Fixes #33056.
-
-    *Federico Martinez*
-
-*   Add basic API for connection switching to support multiple databases.
-
-    1) Adds a `connects_to` method for models to connect to multiple databases. Example:
-
-    ```
-    class AnimalsModel < ApplicationRecord
-      self.abstract_class = true
-
-      connects_to database: { writing: :animals_primary, reading: :animals_replica }
-    end
-
-    class Dog < AnimalsModel
-      # connected to both the animals_primary db for writing and the animals_replica for reading
-    end
-    ```
-
-    2) Adds a `connected_to` block method for switching connection roles or connecting to
-    a database that the model didn't connect to. Connecting to the database in this block is
-    useful when you have another defined connection, for example `slow_replica` that you don't
-    want to connect to by default but need in the console, or a specific code block.
-
-    ```
-    ActiveRecord::Base.connected_to(role: :reading) do
-      Dog.first # finds dog from replica connected to AnimalsBase
-      Book.first # doesn't have a reading connection, will raise an error
-    end
-    ```
-
-    ```
-    ActiveRecord::Base.connected_to(database: :slow_replica) do
-      SlowReplicaModel.first # if the db config has a slow_replica configuration this will be used to do the lookup, otherwise this will throw an exception
-    end
-    ```
-
-    *Eileen M. Uchitelle*
-
-*   Enum raises on invalid definition values
-
-    When defining a Hash enum it can be easy to use `[]` instead of `{}`. This
-    commit checks that only valid definition values are provided, those can
-    be a Hash, an array of Symbols or an array of Strings. Otherwise it
-    raises an `ArgumentError`.
-
-    Fixes #33961
-
-    *Alberto Almagro*
-
-*   Reloading associations now clears the Query Cache like `Persistence#reload` does.
-
-    ```
-    class Post < ActiveRecord::Base
-      has_one :category
-      belongs_to :author
-      has_many :comments
-    end
-
-    # Each of the following will now clear the query cache.
-    post.reload_category
-    post.reload_author
-    post.comments.reload
-    ```
-
-    *Christophe Maximin*
-
-*   Added `index` option for `change_table` migration helpers.
-    With this change you can create indexes while adding new
-    columns into the existing tables.
-
-    Example:
-
-        change_table(:languages) do |t|
-          t.string :country_code, index: true
-        end
-
-    *Mehmet Emin İNAÇ*
-
-*   Fix `transaction` reverting for migrations.
-
-    Before: Commands inside a `transaction` in a reverted migration ran uninverted.
-    Now: This change fixes that by reverting commands inside `transaction` block.
-
-    *fatkodima*, *David Verhasselt*
-
-*   Raise an error instead of scanning the filesystem root when `fixture_path` is blank.
-
-    *Gannon McGibbon*, *Max Albrecht*
-
-*   Allow `ActiveRecord::Base.configurations=` to be set with a symbolized hash.
-
-    *Gannon McGibbon*
-
-*   Don't update counter cache unless the record is actually saved.
-
-    Fixes #31493, #33113, #33117.
-
-    *Ryuta Kamizono*
-
-*   Deprecate `ActiveRecord::Result#to_hash` in favor of `ActiveRecord::Result#to_a`.
-
-    *Gannon McGibbon*, *Kevin Cheng*
-
-*   SQLite3 adapter supports expression indexes.
-
-    ```
-    create_table :users do |t|
-      t.string :email
-    end
-
-    add_index :users, 'lower(email)', name: 'index_users_on_email', unique: true
-    ```
-
-    *Gray Kemmey*
-
-*   Allow subclasses to redefine autosave callbacks for associated records.
-
-    Fixes #33305.
-
-    *Andrey Subbota*
-
-*   Bump minimum MySQL version to 5.5.8.
-
-    *Yasuo Honda*
-
-*   Use MySQL utf8mb4 character set by default.
-
-    `utf8mb4` character set with 4-Byte encoding supports supplementary characters including emoji.
-    The previous default 3-Byte encoding character set `utf8` is not enough to support them.
-
-    *Yasuo Honda*
-
-*   Fix duplicated record creation when using nested attributes with `create_with`.
-
-    *Darwin Wu*
-
-*   Configuration item `config.filter_parameters` could also filter out
-    sensitive values of database columns when call `#inspect`.
-    We also added `ActiveRecord::Base::filter_attributes`/`=` in order to
-    specify sensitive attributes to specific model.
-
-    ```
-    Rails.application.config.filter_parameters += [:credit_card_number, /phone/]
-    Account.last.inspect # => #<Account id: 123, name: "DHH", credit_card_number: [FILTERED], telephone_number: [FILTERED] ...>
-    SecureAccount.filter_attributes += [:name]
-    SecureAccount.last.inspect # => #<SecureAccount id: 42, name: [FILTERED], credit_card_number: [FILTERED] ...>
-    ```
-
-    *Zhang Kang*, *Yoshiyuki Kinjo*
-
-*   Deprecate `column_name_length`, `table_name_length`, `columns_per_table`,
-    `indexes_per_table`, `columns_per_multicolumn_index`, `sql_query_length`,
-    and `joins_per_query` methods in `DatabaseLimits`.
-
-    *Ryuta Kamizono*
-
-*   `ActiveRecord::Base.configurations` now returns an object.
-
-    `ActiveRecord::Base.configurations` used to return a hash, but this
-    is an inflexible data model. In order to improve multiple-database
-    handling in Rails, we've changed this to return an object. Some methods
-    are provided to make the object behave hash-like in order to ease the
-    transition process. Since most applications don't manipulate the hash
-    we've decided to add backwards-compatible functionality that will throw
-    a deprecation warning if used, however calling `ActiveRecord::Base.configurations`
-    will use the new version internally and externally.
-
-    For example, the following `database.yml`:
-
-    ```
-    development:
-      adapter: sqlite3
-      database: db/development.sqlite3
-    ```
-
-    Used to become a hash:
-
-    ```
-    { "development" => { "adapter" => "sqlite3", "database" => "db/development.sqlite3" } }
-    ```
-
-    Is now converted into the following object:
-
-    ```
-    #<ActiveRecord::DatabaseConfigurations:0x00007fd1acbdf800 @configurations=[
-      #<ActiveRecord::DatabaseConfigurations::HashConfig:0x00007fd1acbded10 @env_name="development",
-        @spec_name="primary", @config={"adapter"=>"sqlite3", "database"=>"db/development.sqlite3"}>
-      ]
-    ```
-
-    Iterating over the database configurations has also changed. Instead of
-    calling hash methods on the `configurations` hash directly, a new method `configs_for` has
-    been provided that allows you to select the correct configuration. `env_name` and
-    `spec_name` arguments are optional. For example, these return an array of
-    database config objects for the requested environment and a single database config object
-    will be returned for the requested environment and specification name respectively.
-
-    ```
-    ActiveRecord::Base.configurations.configs_for(env_name: "development")
-    ActiveRecord::Base.configurations.configs_for(env_name: "development", spec_name: "primary")
-    ```
-
-    *Eileen M. Uchitelle*, *Aaron Patterson*
-
-*   Add database configuration to disable advisory locks.
-
-    ```
-    production:
-      adapter: postgresql
-      advisory_locks: false
-    ```
-
-    *Guo Xiang*
-
-*   SQLite3 adapter `alter_table` method restores foreign keys.
-
-    *Yasuo Honda*
-
-*   Allow `:to_table` option to `invert_remove_foreign_key`.
-
-    Example:
-
-       remove_foreign_key :accounts, to_table: :owners
-
-    *Nikolay Epifanov*, *Rich Chen*
-
-*   Add environment & load_config dependency to `bin/rake db:seed` to enable
-    seed load in environments without Rails and custom DB configuration
-
-    *Tobias Bielohlawek*
-
-*   Fix default value for mysql time types with specified precision.
-
-    *Nikolay Kondratyev*
-
-*   Fix `touch` option to behave consistently with `Persistence#touch` method.
-
-    *Ryuta Kamizono*
-
-*   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/suffix options to `ActiveRecord::Store.store_accessor`.
-
-    *Tan Huynh*, *Yukio Mizuta*
-
-*   Rails 6 requires Ruby 2.5.0 or newer.
-
-    *Jeremy Daer*, *Kasper Timm Hansen*
-
-*   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](https://github.com/rails/rails/blob/5-2-stable/activerecord/CHANGELOG.md) for previous changes.
+Please check [6-0-stable](https://github.com/rails/rails/blob/6-0-stable/activerecord/CHANGELOG.md) for previous changes.