1 files changed, 420 insertions, 16 deletions

diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 74f5666de0..39c8769814 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,412 @@
+*   Deprecate `serialized_attributes` without replacement. You can access its
+    behavior by going through the column's type object.
+
+    *Sean Griffin*
+
+*   Correctly extract IPv6 addresses from `DATABASE_URI`: the square brackets
+    are part of the URI structure, not the actual host.
+
+    Fixes #15705.
+
+    *Andy Bakun*, *Aaron Stone*
+
+*   Ensure both parent IDs are set on join records when both sides of a
+    through association are new.
+
+    *Sean Griffin*
+
+*   `ActiveRecord::Dirty` now detects in-place changes to mutable values.
+    Serialized attributes on ActiveRecord models will no longer save when
+    unchanged. Fixes #8328.
+
+    Sean Griffin
+
+*   Fixed automatic maintaining test schema to properly handle sql structure
+    schema format.
+
+    Fixes #15394.
+
+    *Wojciech Wnętrzak*
+
+*   Pluck now works when selecting columns from different tables with the same
+    name.
+
+    Fixes #15649
+
+    *Sean Griffin*
+
+*   Remove `cache_attributes` and friends. All attributes are cached.
+
+    *Sean Griffin*
+
+*   Remove deprecated method `ActiveRecord::Base.quoted_locking_column`.
+
+    *Akshay Vishnoi*
+
+*   `ActiveRecord::FinderMethods.find` with block can handle proc parameter as
+    `Enumerable#find` does.
+
+    Fixes #15382.
+
+    *James Yang*
+
+*   Make timezone aware attributes work with PostgreSQL array columns.
+
+    Fixes #13402.
+
+    *Kuldeep Aggarwal*, *Sean Griffin*
+
+*   `ActiveRecord::SchemaMigration` has no primary key regardless of the
+    `primary_key_prefix_type` configuration.
+
+    Fixes #15051.
+
+    *JoseLuis Torres*, *Yves Senn*
+
+*   `rake db:migrate:status` works with legacy migration numbers like `00018_xyz.rb`.
+
+    Fixes #15538.
+
+    *Yves Senn*
+
+*   Baseclass becomes! subclass.
+
+    Before this change, a record which changed its STI type, could not be
+    updated.
+
+    Fixes #14785.
+
+    *Matthew Draper*, *Earl St Sauver*, *Edo Balvers*
+
+*   Remove deprecated `ActiveRecord::Migrator.proper_table_name`. Use the
+    `proper_table_name` instance method on `ActiveRecord::Migration` instead.
+
+    *Akshay Vishnoi*
+
+*   Fix regression on eager loading association based on SQL query rather than
+    existing column.
+
+    Fixes #15480.
+
+    *Lauro Caetano*, *Carlos Antonio da Silva*
+
+*   Return a null column from `column_for_attribute` when no column exists.
+
+    *Sean Griffin*
+
+*   Implemented ActiveRecord::Base#pretty_print to work with PP.
+
+    *Ethan*
+
+*   Preserve type when dumping PostgreSQL point, bit, bit varying and money
+    columns.
+
+    *Yves Senn*
+
+*   New records remain new after YAML serialization.
+
+    *Sean Griffin*
+
+*   PostgreSQL support default values for enum types. Fixes #7814.
+
+    *Yves Senn*
+
+*   PostgreSQL `default_sequence_name` respects schema. Fixes #7516.
+
+    *Yves Senn*
+
+*   Fixed `columns_for_distinct` of postgresql adapter to work correctly
+    with orders without sort direction modifiers.
+
+    *Nikolay Kondratyev*
+
+*   PostgreSQL `reset_pk_sequence!` respects schemas. Fixes #14719.
+
+    *Yves Senn*
+
+*   Keep PostgreSQL `hstore` and `json` attributes as `Hash` in `@attributes`.
+    Fixes duplication in combination with `store_accessor`.
+
+    Fixes #15369.
+
+    *Yves Senn*
+
+*   `rake railties:install:migrations` respects the order of railties.
+
+    *Arun Agrawal*
+
+*   Fix redefine a has_and_belongs_to_many inside inherited class
+    Fixing regression case, where redefining the same has_an_belongs_to_many
+    definition into a subclass would raise.
+
+    Fixes #14983.
+
+    *arthurnn*
+
+*   Fix has_and_belongs_to_many public reflection.
+    When defining a has_and_belongs_to_many, internally we convert that to two has_many.
+    But as `reflections` is a public API, people expect to see the right macro.
+
+    Fixes #14682.
+
+    *arthurnn*
+
+*   Fixed serialization for records with an attribute named `format`.
+
+    Fixes #15188.
+
+    *Godfrey Chan*
+
+*   When a `group` is set, `sum`, `size`, `average`, `minimum` and `maximum`
+    on a NullRelation should return a Hash.
+
+    *Kuldeep Aggarwal*
+
+*   Fixed serialized fields returning serialized data after being updated with
+    `update_column`.
+
+    *Simon Hørup Eskildsen*
+
+*   Fixed polymorphic eager loading when using a String as foreign key.
+
+    Fixes #14734.
+
+    *Lauro Caetano*
+
+*   Change belongs_to touch to be consistent with timestamp updates
+
+    If a model is set up with a belongs_to: touch relationship the parent
+    record will only be touched if the record was modified. This makes it
+    consistent with timestamp updating on the record itself.
+
+    *Brock Trappitt*
+
+*   Fixed the inferred table name of a has_and_belongs_to_many auxiliar
+    table inside a schema.
+
+    Fixes #14824
+
+    *Eric Chahin*
+
+*   Remove unused `:timestamp` type. Transparently alias it to `:datetime`
+    in all cases. Fixes inconsistencies when column types are sent outside of
+    `ActiveRecord`, such as for XML Serialization.
+
+    *Sean Griffin*
+
+*   Fix bug that added `table_name_prefix` and `table_name_suffix` to
+    extension names in PostgreSQL when migrating.
+
+    *Joao Carlos*
+
+*   The `:index` option in migrations, which previously was only available for
+    `references`, now works with any column types.
+
+    *Marc Schütz*
+
+*   Add support for counter name to be passed as parameter on `CounterCache::ClassMethods#reset_counters`.
+
+    *jnormore*
+
+*   Restrict deletion of record when using `delete_all` with `uniq`, `group`, `having`
+    or `offset`.
+
+    In these cases the generated query ignored them and that caused unintended
+    records to be deleted.
+
+    Fixes #11985.
+
+    *Leandro Facchinetti*
+
+*   Floats with limit >= 25 that get turned into doubles in MySQL no longer have
+    their limit dropped from the schema.
+
+    Fixes #14135.
+
+    *Aaron Nelson*
+
+*   Fix how to calculate associated class name when using namespaced has_and_belongs_to_many
+    association.
+
+    Fixes #14709.
+
+    *Kassio Borges*
+
+*   `ActiveRecord::Relation::Merger#filter_binds` now compares equivalent symbols and
+    strings in column names as equal.
+
+    This fixes a rare case in which more bind values are passed than there are
+    placeholders for them in the generated SQL statement, which can make PostgreSQL
+    throw a `StatementInvalid` exception.
+
+    *Nat Budin*
+
+*   Fix `stored_attributes` to correctly merge the details of stored
+    attributes defined in parent classes.
+
+    Fixes #14672.
+
+    *Brad Bennett*, *Jessica Yao*, *Lakshmi Parthasarathy*
+
+*   `change_column_default` allows `[]` as argument to `change_column_default`.
+
+    Fixes #11586.
+
+    *Yves Senn*
+
+*   Handle `name` and `"char"` column types in the PostgreSQL adapter.
+
+    `name` and `"char"` are special character types used internally by
+    PostgreSQL and are used by internal system catalogs. These field types
+    can sometimes show up in structure-sniffing queries that feature internal system
+    structures or with certain PostgreSQL extensions.
+
+    *J Smith*, *Yves Senn*
+
+*   Fix `PostgreSQLAdapter::OID::Float#type_cast` to convert Infinity and
+    NaN PostgreSQL values into a native Ruby `Float::INFINITY` and `Float::NAN`
+
+    Before:
+
+        Point.create(value: 1.0/0)
+        Point.last.value # => 0.0
+
+    After:
+
+        Point.create(value: 1.0/0)
+        Point.last.value # => Infinity
+
+    *Innokenty Mikhailov*
+
+*   Allow the PostgreSQL adapter to handle bigserial primary key types again.
+
+    Fixes #10410.
+
+    *Patrick Robertson*
+
+*   Deprecate joining, eager loading and preloading of instance dependent
+    associations without replacement. These operations happen before instances
+    are created. The current behavior is unexpected and can result in broken
+    behavior.
+
+    Fixes #15024.
+
+    *Yves Senn*
+
+*   Fixed has_and_belongs_to_many's CollectionAssociation size calculation.
+
+    has_and_belongs_to_many should fall back to using the normal CollectionAssociation's
+    size calculation if the collection is not cached or loaded.
+
+    Fixes #14913, #14914.
+
+    *Fred Wu*
+
+*   Return a non zero status when running `rake db:migrate:status` and migration table does
+    not exist.
+
+    *Paul B.*
+
+*   Add support for module-level `table_name_suffix` in models.
+
+    This makes `table_name_suffix` work the same way as `table_name_prefix` when
+    using namespaced models.
+
+    *Jenner LaFave*
+
+*   Revert the behaviour of `ActiveRecord::Relation#join` changed through 4.0 => 4.1 to 4.0.
+
+    In 4.1.0 `Relation#join` is delegated to `Arel#SelectManager`.
+    In 4.0 series it is delegated to `Array#join`.
+
+    *Bogdan Gusiev*
+
+*   Log nil binary column values correctly.
+
+    When an object with a binary column is updated with a nil value
+    in that column, the SQL logger would throw an exception when trying
+    to log that nil value. This only occurs when updating a record
+    that already has a non-nil value in that column since an initial nil
+    value isn't included in the SQL anyway (at least, when dirty checking
+    is enabled.) The column's new value will now be logged as `<NULL binary data>`
+    to parallel the existing `<N bytes of binary data>` for non-nil values.
+
+    *James Coleman*
+
+*   Rails will now pass a custom validation context through to autosave associations
+    in order to validate child associations with the same context.
+
+    Fixes #13854.
+
+    *Eric Chahin*, *Aaron Nelson*, *Kevin Casey*
+
+*   Stringify all variables keys of MySQL connection configuration.
+
+    When `sql_mode` variable for MySQL adapters set in configuration as `String`
+    was ignored and overwritten by strict mode option.
+
+    Fixes #14895.
+
+    *Paul Nikitochkin*
+
+*   Ensure SQLite3 statements are closed on errors.
+
+    Fixes #13631.
+
+    *Timur Alperovich*
+
+*   Give ActiveRecord::PredicateBuilder private methods the privacy they deserve.
+
+    *Hector Satre*
+
+*   When using a custom `join_table` name on a `habtm`, rails was not saving it
+    on Reflections. This causes a problem when rails loads fixtures, because it
+    uses the reflections to set database with fixtures.
+
+    Fixes #14845.
+
+    *Kassio Borges*
+
+*   Reset the cache when modifying a Relation with cached Arel.
+    Additionally display a warning message to make the user aware.
+
+    *Yves Senn*
+
+*   PostgreSQL should internally use `:datetime` consistently for TimeStamp. Assures
+    different spellings of timestamps are treated the same.
+
+    Example:
+
+        mytimestamp.simplified_type('timestamp without time zone')
+        # => :datetime
+        mytimestamp.simplified_type('timestamp(6) without time zone')
+        # => also :datetime (previously would be :timestamp)
+
+    See #14513.
+
+    *Jefferson Lai*
+
+*   `ActiveRecord::Base.no_touching` no longer triggers callbacks or start empty transactions.
+
+    Fixes #14841.
+
+    *Lucas Mazza*
+
+*   Fix name collision with `Array#select!` with `Relation#select!`.
+
+    Fixes #14752.
+
+    *Earl St Sauver*
+
+*   Fixed unexpected behavior for `has_many :through` associations going through a scoped `has_many`.
+
+    If a `has_many` association is adjusted using a scope, and another `has_many :through`
+    uses this association, then the scope adjustment is unexpectedly neglected.
+
+    Fixes #14537.
+
+    *Jan Habermann*
+
 *   `@destroyed` should always be set to `false` when an object is duped.
 
     *Kuldeep Aggarwal*
@@ -14,7 +423,7 @@
 
     *Eric Chahin*
 
-*   `sanitize_sql_like` helper method to escape a string for safe use in a SQL
+*   `sanitize_sql_like` helper method to escape a string for safe use in an SQL
     LIKE statement.
 
     Example:
@@ -50,7 +459,7 @@
     *Lauro Caetano*
 
 *   Calling `delete_all` on an unloaded `CollectionProxy` no longer
-    generates a SQL statement containing each id of the collection:
+    generates an SQL statement containing each id of the collection:
 
     Before:
 
@@ -91,7 +500,7 @@
 
 *   Auto-generate stable fixture UUIDs on PostgreSQL.
 
-    Fixes: #11524
+    Fixes #11524.
 
     *Roderick van Domburg*
 
@@ -175,10 +584,6 @@
 
     *Luke Steensen*
 
-*   Make possible to change `record_timestamps` inside Callbacks.
-
-    *Tieg Zaharia*
-
 *   Fixed error where .persisted? throws SystemStackError for an unsaved model with a
     custom primary key that didn't save due to validation error.
 
@@ -209,12 +614,6 @@
 
     *Cody Cutrer*, *Steve Rice*, *Rafael Mendonça Franca*
 
-*   Save `has_one` association even if the record doesn't changed.
-
-    Fixes #14407.
-
-    *Rafael Mendonça França*
-
 *   Use singular table name in generated migrations when
     `ActiveRecord::Base.pluralize_table_names` is `false`.
 
@@ -274,12 +673,11 @@
 
     *arthurnn*
 
-*   Passing an Active Record object to `find` is now deprecated.  Call `.id`
-    on the object first.
-
 *   Passing an Active Record object to `find` or `exists?` is now deprecated.
     Call `.id` on the object first.
 
+    *Aaron Patterson*
+
 *   Only use BINARY for MySQL case sensitive uniqueness check when column has a case insensitive collation.
 
     *Ryuta Kamizono*
@@ -293,6 +691,12 @@
 
     *Troy Kruthoff*, *Lachlan Sylvester*
 
+*   Only save has_one associations if record has changes.
+    Previously after save related callbacks, such as `#after_commit`, were triggered when the has_one
+    object did not get saved to the db.
+
+    *Alan Kennedy*
+
 *   Allow strings to specify the `#order` value.
 
     Example: